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  <front>
    <journal-meta />
    <article-meta>
      <title-group>
        <article-title>Superlative quanti ers and epistemic interpretation of disjunction</article-title>
      </title-group>
      <contrib-group>
        <aff id="aff0">
          <label>0</label>
          <institution>Ruhr-University Bochum, Department of Philosophy</institution>
        </aff>
      </contrib-group>
      <fpage>73</fpage>
      <lpage>91</lpage>
      <abstract>
        <p>We discuss semantics of superlative quanti ers at most n and at least n. We argue that the meaning of a quanti er is a pair specifying a veri cation and a falsi cation condition for sentences with this quanti er. We further propose that the veri cation condition of superlative quantiers should be interpreted in an epistemic way, that is as a conjunctive list of possibilities. We also present results of a reasoning experiment in which we analyze the acceptance rate of inferences with superlative and comparative quanti ers in German. We discuss the results in the light of our proposal.</p>
      </abstract>
    </article-meta>
  </front>
  <body>
    <sec id="sec-1">
      <title>Introduction</title>
      <sec id="sec-1-1">
        <title>There is an ongoing debate (Look inter alia: (Geurts &amp; Nouwen, 2007), (Koster</title>
        <p>
          Moeller et al, 2008),
          <xref ref-type="bibr" rid="ref7">(Geurts et al., 2010)</xref>
          ,
          <xref ref-type="bibr" rid="ref4 ref7">(Cummins &amp; Katsos, 2010)</xref>
          ,
          <xref ref-type="bibr" rid="ref13">(Nouwen,
2010)</xref>
          ,
          <xref ref-type="bibr" rid="ref3">(Cohen &amp; Krifka, 2011)</xref>
          ) concerning the right semantical interpretation
of so-called superlative quanti ers, such as at most n and at least n, where
n represents a bare numeral, e.g two. Generalized Quanti er Theory (referred
here as a \standard account") de nes superlative quanti ers as equivalent to
respective comparative quanti ers: fewer than n and more than n, that is:
at most n (A; B) () f ewer than n + 1(A; B)1
at least n (A; B) () more than n
1(A; B)
(1)
(2)
        </p>
        <p>
          It has been observed that in natural languages those equivalences (1) and (2)
might not hold, or at least they might not be accepted by language users based
on pragmatical grounds. There are numerous di erences between comparative
and superlative quanti ers involving their linguistic use, acquisition, processing
and the inference patterns in which they occur. First of all, it seems that
superlative and comparative quanti ers are not freely exchangeable in same linguistic
contexts.
          <xref ref-type="bibr" rid="ref6">Geurts &amp; Nouwen (2007)</xref>
          provide, among many others, such examples:
(a) I will invite at most two people, namely Jack and Jill.
        </p>
        <p>(b) I will invite fewer than three people, namely Jack and Jill.
1 Q(A,B) means Q A's are B, where Q is a h1; 1i generalized quanti er</p>
        <p>where (a) is considered a good sentence, while (b) is less felicitous. The
contrast between (a) and (b) suggest that while embedding an inde nite expression
(two) in a superlative quanti er licenses a speci c construal (namely Jack and</p>
      </sec>
      <sec id="sec-1-2">
        <title>Jill ), the same is not licensed in the case of a comparative modi er.</title>
        <p>
          Secondly, it has been demonstrated that superlative quanti ers are mastered
later than the comparative ones during language development
          <xref ref-type="bibr" rid="ref12">(Musolino, 2004)</xref>
          ,
          <xref ref-type="bibr" rid="ref7">(Geurts et al., 2010)</xref>
          . Furthermore, there is ample data concerning processing of
those quanti ers. It has been for instance shown that veri cation of sentences
with superlative quanti ers requires a longer time than veri cation of sentences
with respective comparative quanti ers
          <xref ref-type="bibr" rid="ref9">(Koster-Moeller et al, 2008)</xref>
          ,
          <xref ref-type="bibr" rid="ref7">(Geurts et
al., 2010)</xref>
          . Moreover, the processing of quanti ers is in uenced by their
monotonicity. A quanti er Q(A; B) is upward monotone in its rst argument A if it
licences inferences from subsets to supersets, that is if Q(A; B) and A A0, then
Q(A0; B). A quanti er Q(A; B) is downward monotone in its rst argument A if
it licences inferences from supersets to subsets, that is if Q(A; B) and A0 A,
then Q(A0; B). Understood as h1; 1i generalized quanti ers, at least n and more
than n are upward monotone in both their arguments, while at most n and fewer
than n are downward monotone. It has been shown that although the downward
monotone at most n and fewer than n take a longer time to be veri ed than the
upward monotone at least n and more than n, they are actually falsi ed faster
          <xref ref-type="bibr" rid="ref9">(Koster-Moeller et al, 2008)</xref>
          .
        </p>
        <p>
          Finally, important arguments against the semantical equivalence between the
comparative and superlative quanti ers come from the analysis of people's
acceptance of inferences with those quanti ers. Empirical data show that a majority
of responders usually reject inferences from at most n to at most n+, (where n+
denotes any natural number greater than n), although they accept presumably
equivalent inferences with comparative quanti ers
          <xref ref-type="bibr" rid="ref7">(Geurts et al., 2010)</xref>
          ,
          <xref ref-type="bibr" rid="ref4 ref7">(Cummins &amp; Katsos, 2010)</xref>
          . To illustrate it with an example: while people are unlikely
to accept that if at most 5 kids are playing in this room, then at most 6 kids are
playing in this room (2-14% in Cummins' and Geurts' experiments for this
inference scheme) they are more likely to accept that if fewer than 5 kids are playing
in this room, then fewer than 6 kids are playing in this room (between 60-70%
in Cummins'and Geurts'). Such data seem to directly contradict the standard
account.
2
        </p>
      </sec>
    </sec>
    <sec id="sec-2">
      <title>Modal semantics or clausal implicature?</title>
      <p>
        Several theories have been developed to explain why seemingly logically
equivalent quanti ers show such big di erences in the way people use them in the
language.
        <xref ref-type="bibr" rid="ref6">Geurts (2007)</xref>
        , (2010) proposes modal semantics for superlative
quanti ers and rejects the assumption that equivalences (1) and (2) hold in natural
languages. According to this proposal (referred here as a \modal account"), while
more than n and less than n have a conventional meaning de ned in terms of
inequality relation, at least n and at most n have a modal component, namely:
at least n A's are B means that: a speaker is certain that there are n elements
which are both A and B, and considers it possible that there are more than n.
at most n A's are B means that: a speaker is certain that there is no more
than n elements that are both A and B, and considers it possible that there
are n elements.
      </p>
      <sec id="sec-2-1">
        <title>According to this proposal, as semantically richer, superlative quanti ers are</title>
        <p>expected to be harder to process than the respective comparative quanti ers.</p>
      </sec>
      <sec id="sec-2-2">
        <title>Finally, de ned as above, at most n A are B does not imply at most n+ A are</title>
      </sec>
      <sec id="sec-2-3">
        <title>B : The latter implies that it is possible that there are (exactly) n+ A that are</title>
      </sec>
      <sec id="sec-2-4">
        <title>B, which is contradicted by the semantics of at most n in the premise.</title>
      </sec>
      <sec id="sec-2-5">
        <title>There are strong arguments against the modal account. For instance this ac</title>
        <p>
          count seems unsatisfactory with regard to superlative quanti ers embedded in
conditional and various other contexts. Authors
          <xref ref-type="bibr" rid="ref6">(Geurts &amp; Nouwen, 2007)</xref>
          ,
          <xref ref-type="bibr" rid="ref7">(Geurts
et al., 2010)</xref>
          realize themselves this problem and illustrate it with the following
example:
        </p>
        <p>If Berta had at most three drinks, she is t to drive. Berta had at most two
drinks. Conclusion: Berta is t to drive.</p>
      </sec>
      <sec id="sec-2-6">
        <title>Such inferences, which are indeed licensed by the inference from at most n (2) to at most n+ (3), are commonly accepted by speakers (over 96% in Geurts's experiment).</title>
      </sec>
      <sec id="sec-2-7">
        <title>Furthermore, while inferences from at most n to at most n+(1) are rejected by majority of people (ca 84% in Geurts' experiment) there are subjects who do accept them (14% in Geurts' and even more in our experiment | ca. 23%).</title>
        <p>If at most n logically implies possible that n and not possible that more than
n, then the inference from at most n to at most n+ should be inaccessible
(except for cases of random mistakes) for any language users, due to the apparent
contradiction between the premise and the conclusion. Last but not least, to say
that possible that n is a part of the semantics of at most n, implies that at most
n cannot be paraphrased by not more than n. However such a paraphrase seems
totally eligible.</p>
      </sec>
      <sec id="sec-2-8">
        <title>A slightly di erent account was proposed by Cummins &amp; Katsos (2010), who</title>
        <p>observe that the considered linguistical phenomena could be better explained on
pragmatical grounds. The authors show that people do not evaluate at most n
and exactly n-1 as equally semantically incoherent as cases of obvious logical
incoherence, e.g. at most n and exactly n+1 or more than n and exactly n-1.</p>
      </sec>
      <sec id="sec-2-9">
        <title>While sentence pairs, such as:</title>
        <sec id="sec-2-9-1">
          <title>Jean has at most n houses. Speci cally she has exactly n+1 houses.</title>
          <p>get average coherence judgments very low, i.e.
(incoherent) to +5 (coherent), sentence pairs:</p>
        </sec>
      </sec>
      <sec id="sec-2-10">
        <title>4, in the scale from 5</title>
        <sec id="sec-2-10-1">
          <title>Jean has at most n houses. Speci cally she has n-1 houses</title>
          <p>get already +1:9. This result speaks against the \modal account", whose
direct consequence is semantical incompatibility of at most n and exactly n-.</p>
        </sec>
      </sec>
      <sec id="sec-2-11">
        <title>Consequently, Cummins et al. agree with Geurts that at most n and at least</title>
        <p>
          n both imply possible that n, but they claim that this is a pragmatical rather
than a logical inference, namely a co-called clausal implicature
          <xref ref-type="bibr" rid="ref11">(Levinson, 1983)</xref>
          .
        </p>
      </sec>
      <sec id="sec-2-12">
        <title>Clausal implicature is a quantity implicature inferred due to use of epistemically</title>
        <p>weak statement. Since the expressed statement with a superlative quanti er e.g.
at most n A are B, as equivalent to a disjunctive statement there are exactly n
or fewer than n elements that are both A and B, does not imply the truth of its
subordinate proposition p = there are exactly n elements that are A and B, the
possibility that p might or might not be true is inferred.</p>
        <p>Although we agree with the intuitions concerning a modal component in the
reasoning with superlative quanti ers, we reject the assumption by Geurts et al.
that this component is a part of their meaning. Furthermore, although we agree
with Cummins et al. that the mechanism that results with the observed inference
patterns is more of a pragmatical nature, we are not satis ed with the \causal
implicature" account. What we lack is a deeper insight into the source of this
kind of a pragmatical inference and how it interacts with the logical meaning of
those quanti ers in di erent reasoning contexts.</p>
        <p>Our motivation to further experimentally investigate reasoning with
superlative quanti ers is based inter alia on: (i) the lack of data concerning whether
people accept inferences: at least n ! at least n -, (ii) the lack of satisfactory data
about how people accept inference with logically equivalent forms of superlative
quanti ers: such as not more than n/not fewer than n or n or fewer than n/n
or more than n, as well as how they accept mutual equivalences between these
forms, (iii) nally, the lack of data concerning people's acceptance of logically
incorrect inferences with the quanti ers considered here.
3</p>
      </sec>
    </sec>
    <sec id="sec-3">
      <title>Two semantic conditions for at most n</title>
      <sec id="sec-3-1">
        <title>Krifka (1999) points out that semantic interpretation of a sentence is usually a</title>
        <p>pair that speci es when the sentence is true and when it is false. Following Krifka,
we propose to de ne meaning of a quanti er as a pair hCF ; CV i, where CV is a
veri cation condition (speci es how to verify sentences with this quanti er) and
CF is a falsi cation condition (speci es how to falsify sentences with this
quantier). Furthermore, we propose that the interpretation of a quanti er depends on
a semantic context in which this quanti er is used, namely whether the context
requires the use of the veri cation condition or the falsi cation condition.
Veri cation and falsi cation conditions are to be understood algorithmically, with
the \else" part of the conditional instruction being empty - thus, they verify (or
falsify) the formulas only if their conditional test is satis ed. From a perspective
of classical logic, these conditions should be dual, namely if C is a CV condition
for sentence , then C is a CF condition for sentence : , and vice versa. We
further, however, observe that in the case of superlative quanti ers, there is a
split between these two conditions. We suggest, that this split is a result of a
pragmatic focus on the expressed borderline n.</p>
        <p>
          One can think of the meaning of logical operators, thus also quanti ers, in
terms of algorithms, that have to be performed in order to verify (or falsify)
sentences with those operators. (See also
          <xref ref-type="bibr" rid="ref14 ref16">(Szymanik, 2009)</xref>
          ,
          <xref ref-type="bibr" rid="ref15">(Szymanik &amp;
Zajenowski, 2010)</xref>
          ,
          <xref ref-type="bibr" rid="ref14 ref16">(Szymanik &amp; Zajenowski, 2009)</xref>
          )
          <xref ref-type="bibr" rid="ref10">Krifka (1999)</xref>
          observes, that
a sentence at most n x: (x)2 says only that more than n x: (x) is false, and
leaves a truth condition underspeci ed. In other words, the meaning of at most
n provides an algorithm for falsifying sentences with this quanti er, but not
(immediately) for verifying them. This corresponds with the experimental data
showing that it is easier to falsify sentences with at most than to verify them
          <xref ref-type="bibr" rid="ref9">(Koster-Moeller et al, 2008)</xref>
          . Consequently, the primal semantical condition of at
most n x: (x) could be understood as an algorithm: \falsify when the number
of x that are exceeds n", and would constitute what we understand by the
falsi cation condition.
        </p>
        <p>De nition 1 ( falsi cation condition for at most)</p>
        <p>CF (at most x : (x)) := If 9&gt;nx( (x)); then f alsif y
But how can we know when a sentence with at most n is true? From the point
of view of an algorithm it is a so-called \otherwise" condition that de nes in
this case the truth-condition. However a negation of a falsi cation condition is
in sense informationally empty : it does not describe any concrete situation in
which the given sentence can be veri ed. As a result, in those contexts that
require to directly verify a sentence, we refer to a veri cation condition, which
is speci ed independently. As expressing a positive condition, at most n may be
understood as a disjunction n or fewer than n (\disjunctive at most ").
De nition 2 ( veri cation condition for at most)</p>
        <p>CV (at most n : x (x)) := If (9=nx (x) _ 9&lt;nx (x)); then verif y
The disjunction in 2 could be further broken down to: Win=1 9=ix (x) _
:9x (x), in short: Win=0 9=ix (x), where the disjunct 9=ox (x) means that
:9x (x).3</p>
        <p>And 9=nx (x) means precisely n x are , that is:</p>
        <p>n
9=nx (x) () 9x1:::9xn[ ^
i=1
(xi)^</p>
        <p>^
2 at most n x are
3 Let us observe that 9&lt;nx (x) is a short notation that can be misleading, since it is
not an existential sentence. As existential, fewer than n would imply that there has
to be at least one (though less than n) such x that is . However we would like a
sentence less than n x: (x) to be also true if no x's are . Therefore, in fact, such a
downward entailing sentence is a disguised universal sentence: 8x1::xn(Vin=1 (xi) !
W1 i&lt;j n(xi = xj ))</p>
        <p>Epistemic interpretation of disjunction</p>
      </sec>
      <sec id="sec-3-2">
        <title>Following Zimmermann (2000) we adopt the view that disjunctive sentences</title>
        <p>in natural language are likely to get so-called epistemic reading, that is they
are interpreted as conjunctive lists of epistemic possibilities. According to the
proposed solution a disjunction P1 or:::or Pn is interpreted as an answer to a
question: Q: What might be the case? and, thus, is paraphrased as a (closed) list
L:</p>
        <p>L: P1 (might be the case) [and]... Pn (might be the case) [and (closure) nothing
else might be the case].</p>
      </sec>
      <sec id="sec-3-3">
        <title>This results in the following reading of a disjunctive sentence:</title>
        <p>De nition 3 (Zimmermann, 2000)</p>
        <p>P1 _ ::: _ Pn ()</p>
        <p>P1 ^ ::: ^ Pn
and (closure):</p>
        <p>8P [ P ! [P \ P1 = ; _ ::: _ P \ Pn = ;]]</p>
        <p>
          The character of the closure requires a bit of our attention.
          <xref ref-type="bibr" rid="ref17">Zimmermann
(2000)</xref>
          observes, that disjunctive sentences in natural languages could be
understood as closed (exhaustive lists of possibilities) or open (when other possibilities
are not excluded), which in the spoken language is usually marked by
intonation. Closure in De nition 3 indicates that the list is exhaustive. There are good
reasons to treat NL disjunctions as generally closed, and it would make sense
obviously also in the case of superlative quanti ers. In classical logic the truth
of 9=nx (x) _ 9&lt;nx (x) semantically excludes the option that 9&gt;nx (x), as
contradictory. In our analysis, however, we want to treat closure as a merely
optional condition. This results from regarding the veri cation and falsi cation
conditions as independent from each other.
        </p>
      </sec>
      <sec id="sec-3-4">
        <title>If we assume that disjunctions in natural language are likely to be interpreted as conjunctions of epistemic possibilities, then we get the following veri cation condition for at most :</title>
        <p>De nition 4 ( epistemic interpretation of the veri cation condition for at most)4
4 A detailed description of the modal predicate logic needed for providing semantics
of this kind of sentences is beyond the scope of this paper. For our present purposes
it is just enough to assume that, for each possible world, we have a di erent domain
of objects over which we quantify. We assume also standard semantics for modal
operators, and we restrict to re exive and transitive Kripke models.</p>
        <p>CW (at most n x : (x)) := If ( 9=nx (x) ^ 9&lt;nx (x)); then verif y
and (closure)</p>
      </sec>
      <sec id="sec-3-5">
        <title>Where:</title>
        <p>If</p>
        <p>9&gt;nx (x); then f alsif y
( 9=nx (x) ^ 9&lt;nx (x)) ()
9=ix (x)
(4)
n
^
i=o</p>
      </sec>
      <sec id="sec-3-6">
        <title>Now we can see the asymmetry between the falsi cation and veri cation con</title>
        <p>dition of at most n. While the falsi cation condition speci es precisely when the
sentence has to be rejected as false, the veri cation condition (in the epistemic
reading) provides a conjunctive list of epistemic possibilities that should all be
the case in order to verify it.</p>
        <p>The epistemic reading of the veri cation condition is also what di erentiates
superlative quanti ers from the comparative ones. We propose that the
disjunctive form of the veri cation condition in the case of superlative quanti ers is a
result of the focus on the borderline n. The n mentioned in the superlative
quanti er constitutes the borderline of the truth-conditions, however the numeral n
that occurs in a comparative quanti er is not a part of the truth-conditions. The
borderline of truth-conditions (that is n-1 for fewer than n, and n+1 for more
than n) remains silent. Consequently, the disjunctive form of comparative
quanti ers (and hence also the epistemic reading), though logically possible, is not
pragmatically justi ed. In principle, a comparative quanti er can be as well
interpreted in the epistemic way (as a conjunction of epistemic possibilities). Such
a reading is, however, not equally likely to occur as in the case of a superlative
quanti er, since the borderline is not explicitly expressed.</p>
        <p>Let us observe that closure of the veri cation condition is stronger than
the falsi cation condition. Intuitively, if : (equivalently : ), then as well
: (here: = 9&gt;nx (x)), i.e. , however the theorem holds only in
re exive Kripke frames. Furthermore, the optional character of the closure bases
on our assumption that the falsi cation and veri cation conditions are in a sense
independent and only as a pair constitute the full semantic interpretation. Since
the falsi cation condition, as de ned in 2, is su cient to account for the right
semantical criterion of when the sentence with at most n is false, the closure
of the veri cation condition is redundant and might or might not be considered
in the reasoning process. The optional character of closure turns out crucial in
evaluating validity of inferences with at most n.</p>
      </sec>
      <sec id="sec-3-7">
        <title>When at most n is interpreted as in De nition 4, then the inference from at</title>
        <p>most n to at most n+1 is not valid. Namely, from 9=n (x) ^ 9&lt;nx (x) one
cannot infer 9=n+1x (x) ^ 9&lt;n+1x (x). It is easy to observe that the conjunct
9=n+1x (x) cannot be proven based on the premise, though it can be excluded
only if the closure of the premise is applied.</p>
        <p>On the other hand, the inference: at most n ! at most n-1, which is invalid
in the standard account, in the epistemic interpretation is blocked only due
to closure of the conclusion. That is the 9=nx (x) implied by the premise is
contradicted by the closure of the conclusion, i.e. : 9&gt;n 1x (x). It is important
to notice that without the closure the implication holds (if the epistemic reading
of the veri cation condition is applied).</p>
        <p>In some aspects our proposal might seem similar to Geurts' \modal"
approach, namely we de ne the veri cation condition of at most n and at least
n (see below) in modal terms. The main di erence is that, in our account, it
is only the veri cation condition that is de ned modally, while the falsi cation
condition remains standard. This results in a speci c split or ambiguity in the
meaning of superlative quanti ers.
4</p>
      </sec>
    </sec>
    <sec id="sec-4">
      <title>At least and bare numerals</title>
      <sec id="sec-4-1">
        <title>The quanti er at least n might seem perhaps less interesting than at most n, as</title>
        <p>it seems, as is also evident from our results (see Section (5)), less problematic
from the point of view of reasoning. As an upward monotone quanti er, at least
n appears to provide a clear veri cation algorithm: \verify when n x (that are
) are found". Such a semantical interpretation would not, however, account for
the linguistical di erences between at least n and more than n-1.</p>
      </sec>
      <sec id="sec-4-2">
        <title>Let us start with de ning a falsi cation condition for at least n as follows:</title>
        <p>De nition 5 ( falsi cation condition for at least)</p>
        <p>CF (at least n : x (x)) := If 9&lt;nx (x); then f alsif y</p>
      </sec>
      <sec id="sec-4-3">
        <title>What we expect from the veri cation condition is that it express the whole</title>
        <p>range of epistemic possibilities in which the sentence with at least n can be true.
Understood as in formula (2), thus as equivalent to more than n-1, a sentence
with at least n can be expressed as an existential sentence that merely says that
there are n (x that are ), but does not exclude the possibility that there are
more:
n
9 nx (x) () 9&gt;n 1x (x) () 9x1:::9xn[ ^
i=1
(xi) ^</p>
        <p>^</p>
      </sec>
      <sec id="sec-4-4">
        <title>This formula however, which would be a right veri cation condition for the</title>
        <p>comparative more than n-1, does not outline the borderline n, which is
emphasized in the superlative at least n. Therefore we further break down formula (5)
into a disjunctive formula: (exactly) n or more than n x are , which constitutes
our veri cation condition for at least n.</p>
        <p>De nition 6 ( veri cation condition for at least n)</p>
        <p>CV (at least n : x (x)) := If (9=nx (x) _ 9&gt;nx (x)); then verif y</p>
      </sec>
      <sec id="sec-4-5">
        <title>The latter can be handled as a conjunctive list of possibilities.</title>
        <p>De nition 7 ( epistemic interpretation of the veri cation condition for at least n)</p>
        <p>CF (at least n : x (x)) := If ( 9=nx (x) ^ 9&gt;nx (x)); then verif y
and (closure)</p>
        <p>n 1
If ( _
i=0</p>
        <p>9=ix (x)); then f alsif y</p>
      </sec>
      <sec id="sec-4-6">
        <title>Having introduced the semantical conditions for at least n, we further ana</title>
        <p>lyze how they a ect inferences with this quanti er, in particular we mean here
the inference (at least n! at least n-1 ), as well as its presumably equivalent
disjunctive form: (n or more than n ! n-1 or more than n-1 ). We propose
that the way people handle these inferences depends on how they interpret bare
numerals, such as n.</p>
        <p>From a logical perspective, a bare numeral n (e.g. \two") can be interpreted
as denoting any set of at least n elements, or a set of exactly n elements.5 Thus
= nx : (x) can simply mean that there are n x that are , without any further
constraints on whether there are more. Then, gets the reading as in formula
(5). On the other hand, could be understood with a kind of closure, that is
that there are exactly n x's are , thus as in formula (3).</p>
        <p>
          It has been a matter of a wide debate in formal semantics and pragmatics
what is the right approach to interpreting bare numerals in natural languages. It
has been proposed that: (i) the literal meaning of n is at least n, while the
condition exactly comes as a scalar implicture
          <xref ref-type="bibr" rid="ref8">(Horn, 1972)</xref>
          , (ii) the basic meaning of
n is exactly n, while both at least and at most readings would be context-based
          <xref ref-type="bibr" rid="ref1">(Breheny, 2008)</xref>
          (iii) n is ambiguous between at least n and exactly n
          <xref ref-type="bibr" rid="ref5">(Geurts,
2006)</xref>
          , (iv) n is underspeci ed and can receive at least, at most or exactly readings
depending on the context
          <xref ref-type="bibr" rid="ref2">(Carston, 1998)</xref>
          .
        </p>
        <p>Let us now show how the interpretation of n interacts with the validity of
inferences (n or more than n)! (n-1 or more than n-1 ), given the epistemic
interpretation of disjunction. Suppose now that n is interpreted with a closure:
exactly n. It is easy to observe that, in such a case, possible that n and possible
that more than n does not imply possible that n-1 or possible that more than
na19n.d&gt;Tnhe91=p(nrwe,mitthhiseecplworsohubircleehmVisaint=iinc02tee:rlepmr9ee=tneitdxias(sxi)9n)=WDneh1i,nlewithio9inc&gt;hn7isd1odfeiorslelcontwoltys ifcmroonpmtlyrabdo9itch=tned91&gt;b^ny
the closure of the premise. But suppose that n does not get the \exact" reading,
but it is interpreted barely as there are n, so as (5). Then from possible that n
we can infer possible that n-1, since the latter does not exclude the possibility
that there is a bigger set of elements.
5 or a set of at most n elements, however this interpretation seems to be
counterintuitive and allowed only in special contexts.</p>
      </sec>
    </sec>
    <sec id="sec-5">
      <title>Experiment</title>
      <sec id="sec-5-1">
        <title>We conducted a pilot reasoning experiment (in German) to check how people</title>
        <p>reason with superlative quanti ers: at least n (mindestens n)6 and at most n
(hochstens n), as well as with logically equivalent but linguistically di erent
forms of those quanti ers: a comparative negative form and a disjunctive form.
These were quanti ers: not more than n (nicht mehr als n) and n or fewer than
n (n oder weniger als n) (as logically equivalent to at most n), and not fewer
than n (nicht weniger als n) and n or more than n (n oder mehr als n) (as
equivalent to at least n).</p>
        <p>We were particularly interested in comparing subjects' acceptance of
inferences from at most n to at most n+1 (type B: see Table 1) with their acceptance
of logically equivalent forms of this inference: type D and type F. We were also
interested in people's willingness to infer at most n from not more than n, and
vice versa (type G). Furthermore, we checked the respective inferences with at
least n, that is: at least n ! at least n-1 (type A), and its equivalent forms:
type C and type E. Finally, we checked the inferences between not fewer than
n and at least n (type H). Last but not least we tested the respective incorrect
inferences with the considered quanti ers, in all forms (see Table 2).</p>
        <p>In the premises of our inferences we used four di erent quanti ers: at least
three, at most three, at least four, at most four, and their equivalent forms. All
the numbers were throughout spelled out in words according to the requirements
of German grammar. There was only one example for each distinct inference
relation (i.e. two per inference type). Every sentence content was di erent.
Additionally, to introduce more variation, sentences which had at most 4/at least</p>
      </sec>
      <sec id="sec-5-2">
        <title>4 (or their equivalent forms) in the premise had a quanti er in the subject po</title>
        <p>sition (e.g. At least four computers are broken in the lab), sentences which had
at least 3 /at most 3 in the premise had a quanti er in the object position (e.g.
Arthur has at least three cars.)</p>
      </sec>
      <sec id="sec-5-3">
        <title>As llers we used inferences with so-called bare numerals (e.g. four ): those</title>
        <p>whose correctness depends on the \at least" reading of bare numerals, i.e. n !
n (e.g. 4 ! 3); and those that are logically incorrect independently of the
presumed reading, such as n ! n+ (e.g. 4 ! 5).
5.1</p>
        <p>Procedure
The experiment was conducted on German native speakers, mainly students
of philosophy, psychology, neuroscience and computer sciences. There were 17
subjects (7 male). Subjects were asked to respond \yes" or \no" to the question
whether the second sentence (below the line) has to be true, assumed that they
know that the rst sentence (above the line) is true. For a better understanding
of the task two examples were given: one of a valid inference, that should be
given a \yes" response:
6 We give in brackets the German translation used in the experiment
and one of an invalid inference, that requires a \no" response:</p>
        <p>Inga has done three exercises.</p>
        <p>Inga has done more than two exercises.</p>
        <p>Eva has done three exercises.</p>
        <p>Eva has done fewer than two exercises.</p>
      </sec>
      <sec id="sec-5-4">
        <title>Note that the examples were selected in such a way that their validity did</title>
        <p>not depend on the understanding of any of the tested inference relations, that
is the examples served as an instruction of what is an inference in general, but
not how to evaluate the inferences, that were tested in the experiment.</p>
      </sec>
      <sec id="sec-5-5">
        <title>After reading the instruction subjects saw 40 randomly ordered reasoning</title>
        <p>tasks: one task at a time, displayed on a computer screen. There was no time
limit in the test.</p>
        <p>At the end of the experiment two additional control questions were asked, in
which the inference from at most n to at most n+1 was embedded in a deontic
context. Note that the logically correct response to rst question is \yes", while
to the second is \no".</p>
        <p>(1) Erika promised to drink at most six beers. She drank at most four. Did she
keep her promise?
(2) Thomas is allowed to eat at most three cookies. He ate at most two. Did
he break the rule?
Our rst observation is that people accepted the logically correct inferences much
more frequently than the logically incorrect ones. The incorrect inferences (apart
from disjunctive inferences: E' and F' which turned out specially problematic)
were mostly rejected and their acceptance rate was low enough (1 9%) to
be considered as a result of random mistakes (Table 2). On the other hand all
correct inferences were accepted on the level of at least 20%7, with high variance
depending on the form of an inference, in this: inferences of type B and F seemed
the most problematic.</p>
      </sec>
      <sec id="sec-5-6">
        <title>The important result is that nearly 100% of responders did accept inference</title>
        <p>of type G and H, that is (at most n ! not more than n) as well as (not more
than n ! at most n), and respective inferences between at least n and not
fewer than n, which suggests that they do see those expressions as equivalent.</p>
      </sec>
      <sec id="sec-5-7">
        <title>Furthermore, while inferences from type B, namely the problematic (at most n</title>
        <p>! at most n+1 ) were accepted only by 23% of responders, the inferences of
type D (not more than n ! not more than n+1 ), were already accepted by
44%. The di erence was statistically signi cant: z = 2; 333; p = :02; r = :4 8</p>
      </sec>
      <sec id="sec-5-8">
        <title>Thus, it seems that paraphrasing at most n to the negative form not more than n facilitates the inference.</title>
        <p>The inferences of type A, that is at least n ! at least n-1, turned out relatively
unproblematic for subjects, who accepted them in ca. 80% of cases. Interestingly
a paraphrase to the negative comparative form not fewer than n, made the
task more di cult (59% accepted; means comparison: z = 2:07; p = :038; r =
:355). However, it is worth to note that inferences of type A were still rejected
7 We give an overall result for a given type of an inference
8 In all the cases we used Wilcoxon Signed Ranks test to compare means.
by ca. 20%, which suggests that there is some, at least pragmatic, mechanism
suppressing this inference.</p>
        <p>The results for the disjunctive inferences (E and F) are especially
interesting. First of all the response pattern for disjunctive counterpart of at least
corresponds with the predictions of classical logic: While logically valid inferences
(E) were accepted on a relatively high level of 67% (which is lower, though not
signi cantly lower, compared to the acceptance of the basic form (type A)), the
invalid inferences (E') were mostly rejected (only 20% accept). The opposite
e ect, however, we got for the disjunctive form of at most. The logically valid
inferences (F) were mostly rejected (only 23% accept), whilst invalid inferences (F')
were accepted in exactly 50% of cases. Interestingly the acceptance rate of (F)
inferences was similar to the acceptance rate of the basic form of inferences with
at most (B). In both cases the di erences between acceptance rate of correct and
incorrect forms were statistically signi cant, and were as follows: The di erences
between correct and incorrect inferences with \disjunctive at most " (F and F'):
z = 2:491; p = :013; r = :43 and correct and incorrect \disjunctive at least "
(E and E'): z = 2:165; p = :030; r = :37. The di erences between disjunctive
at most and at least : incorrect (E' and F') z = 2:057; p = :040; r = :36: and
correct (E and F) :z = 2:697; p = :007; r = :46.</p>
      </sec>
      <sec id="sec-5-9">
        <title>The \correct" inferences with bare numerals were accepted in ca. 65% of</title>
        <p>cases. There was only one mistake in the incorrect inferences with bare numerals.</p>
      </sec>
      <sec id="sec-5-10">
        <title>Finally, both embedded at most inferences got nearly 100% correctness rate (one mistake only for question 2).</title>
        <p>6</p>
      </sec>
    </sec>
    <sec id="sec-6">
      <title>Discussion</title>
      <sec id="sec-6-1">
        <title>Although our results cannot be treated as a nal evidence of our theory, our experiment certainly provides various important observations that support the plausibility of our proposal.</title>
      </sec>
      <sec id="sec-6-2">
        <title>First of all, all the implications between the negative comparative and superlative forms of considered quanti ers were almost without exceptions accepted by our subjects. This result supports the assumption that those are semantically equivalent forms in natural language.</title>
        <p>Secondly, the inferences (at least n ! at least n-), although accepted by a
majority of responders, were not as obvious as the standard theory would
predict, and 20% of subjects rejected them (A, Table 1). This suggests existence of
some, at least pragmatic, mechanism interfering in subject's reasoning with at
least. What is also worth reminding, valid inferences with \disjunctive at least "
were rejected even more often (F, Table 1). We consider that this e ect can be
explained in terms of the epistemic interpretation of at least n and its interaction
with the reading of bare numerals. Let us notice that our results provide a weak
evidence for the interplay between the reading of bare numerals and the
treatment of \disjunctive at least " inferences. In our experiment inferences of type
K: n ! n , which base on the \at least" reading of numerals were accepted
in ca. 65% of cases, thus our responders in 35% cases integrated the \exact"
reading of bare numerals, which resulted in their rejection of considered
inferences. However, \disjunctive at least " inferences (type E) ware rejected also in
ca. 33%. We suggest that rejection of type E inferences was as well a result of
an exact reading of a bare numeral n, as we have explained above. Although a
correlation between subject's acceptance of type E and type K inferences failed
to reach signi cance, it was close to signi cant (Spearman's rho= :426, p = :08)
and we expect that with a bigger sample it could reach the signi cance level.</p>
      </sec>
      <sec id="sec-6-3">
        <title>A similar e ect is presumably the reason why 20% of subjects rejected type</title>
        <p>A inferences: (at least n! at least n-1 ). Namely, the application of the
epistemic veri cation condition of at least n together with an exact reading of bare
numerals results in rejection of such inferences. This e ect might be however
weaker and less likely to occur than in the case when the disjunctive form is
given explicitly.</p>
        <p>Thirdly, the surprising result that subjects accepted the invalid inferences
with \disjunctive at most " more frequently than the valid ones can be explained
by our proposal. As we have proposed above, closure in the veri cation condition
is optional, since the falsi cation condition is su cient to account for the right
semantics. However, if context enforces applying one of the semantical conditions
(veri cation or falsi cation), then the other one tends to be ignored. While,
from the perspective of classical logic it should be enough to use only one of
the conditions (since the other can be de ned via the rst one), in the case of
superlative quanti ers the epistemic reading of the veri cation condition creates
the bifurcation in the meaning. This results in di erent inferential patterns in
which those quanti ers occur, depending on what the context primarily enforced:
the veri cation or falsi cation condition.</p>
        <p>In what follows, and as we have explained above, when the veri cation
condition is used, then n or fewer then n does not imply n+ or fewer then n+
due to the epistemic interpretation. Though, it also does not exclude it if no
closure is applied. However, n or fewer then n does imply n- or fewer then n- if
the veri cation condition is used but no closure is applied. Now we can explain
why inferences (F', Table 2): (n or fewer than n) ! (n-1 to fewer than n-1 )
got a 50% rate of acceptance, although they are invalid both in the standard
account and in the epistemic account. Based on De nition 4, 9=nx (x) _ 9&lt;nx (x)
is interpreted as 9=nx (x) ^ 9&lt;nx (x) (with closure: : 9&gt;nx (x)). But
9&lt;nx (x) can be broken down to: = ( 9n 1x (x) ^ 9&lt;n 1x (x)) Now
implies 9=n 1x (x) ^ 9&lt;n 1x (x) (here we use the assumption that the
world accessibility relation is transitive). In such a case it might happen that
the closure of the conclusion, that is: : 9&gt;n 1x (x) which contradicts the
assumption that 9=nx (x) is ignored by subjects, which results in the high logical
mistake ratio.
7</p>
      </sec>
    </sec>
    <sec id="sec-7">
      <title>Conclusions</title>
      <p>We have argued that the meaning of a quanti er can be de ned as a pair
hCF ; CV i, in which the veri cation (CV ) and the falsi cation (CF ) condition
for sentences with this quanti er are speci ed separately. Though from the
logical point of view those conditions should be dual, in the case of superlative
quanti ers they are not. Namely, pragmatic focus on the borderline n in both
at least n and at most n enforces a disjunctive veri cation condition, which is
further interpreted as a conjunctive list of epistemic possibilities.</p>
      <sec id="sec-7-1">
        <title>Finally, we would like to say few words about why we want to understand the</title>
        <p>veri cation and falsi cation conditions in terms of algorithms. Let us make an
observation that semantical equivalence and procedural identity of algorithms
are di erent things. Let us consider algorithms A1 and A2:</p>
        <p>A1 : Count all x that are . If the number m of x that are is smaller than n 1, then
verify.</p>
        <p>A2 : Count all x that are . If the number m of x that are equals n or is smaller than
n, then verify.</p>
        <p>A2 and A3 are semantically equivalent, namely they verify logically
equivalent formulas, e.g. 1, 2 and 3, however in a sense of procedures that are
executed they are not identical.</p>
        <p>1 () :9&gt;nx (x)
2 () 9&lt;n+1 (x)
3 () 9=nx (x) _ 9&lt;nx (x)
1 () 2 () 3
Furthermore, A3
A3 : When the number m of x that are is bigger then n, then falsify.</p>
        <p>is dual to both A1 and A2, namely adding an otherwise verify condition to
A3 and otherwise falsify condition to A1 and A2 would make A3 semantically
equivalent to both A1 and A2. However, without the \otherwise" condition, A3
does not allow to verify any of the given sentences, while A2 or A1 do not allow
to falsify them. Then, hA1; A3i, or hA2; A3i could be considered pairs of partial
algorithms. Each pair could constitute a full semantical interpretation of each of
the sentences 1, 2, 3.</p>
        <p>We consider that logically equivalent, but linguistically di erent, natural
language sentences may trigger di erent kinds of such partial algorithms, or pairs of
partial algorithms. First of all two equivalent sentences that di er in the
linguistical form can trigger as primary only one of the algorithmic conditions: veri
cation or falsi cation, while the complement condition is ignored. Secondly, they
might trigger non-identical veri cation/falsi cation procedures. Consequently, it
might happen that the executed procedures di er in complexity. Additionally,
if we take into account that some extra mechanisms, e.g. the above-discussed
epistemic interpretation of disjunctive conditions, might play a role, we not
only obtain di erent algorithms in the procedural sense but also semantically
non-equivalent algorithms for logically equivalent or even same sentences. For
instance, A2 would be replaced by:</p>
        <p>A02: if [it is possible that there are exactly n x that are AND it is possible that there are
fewer than n x that are ], then verify.</p>
        <p>While A2 is dual to A3, A02 is not anymore. However a pair hA3; A02i could
constitute a semantical interpretation of a natural language sentence at most n :
x (x), which would explain the non-semantically coherent (from the point of
view of classical semantics) inference patterns in which this quanti er occurs.
Appendix: The complete list of pairs of sentences used in the
experiment (premise, conclusion), translated from German.
At least four Anna's dress are red. At least three Anna's dresses are red.</p>
        <p>Arthur has at least three cars. Arthur has at least two cars.</p>
        <p>At most four books were stolen from the library. At most ve books were stolen from the library.
Markus ate at most three pieces of cake. Markus ate at most four pieces of cake.
Not fewer than four cards are missing in the deck. Not fewer than three cards are missing in the
deck.</p>
        <p>A child has painted not fewer than three pictures. A chid has painted not fewer than two pictures.
Not more than four students came today to the philosophy seminar. Not more than ve students
came today to the philosophy seminar.</p>
        <p>Sabine got not more than three presents. Sabine got not more than four presents.
Four or more than four students were sick this week. Three or more than three students were sick
this week.</p>
        <p>Christopher speaks three or more than three languages. Christopher speaks two or more than two
languages.</p>
        <p>Four or fewer than four students have passed the course. Five or fewer than ve students have passed
the course.</p>
        <p>Beate has three or fewer than three children. Beate has four or fewer than four children.
Five people came to the party. Four person came to the party.</p>
        <p>Monika invited six guests to her birthday party. Monika invited two guests to her birthday party.
Seven fruits in the basket have spoilt. Six fruits in the basket have spoilt.</p>
        <p>Alicia bought eight bottles of beer. Alicia bought ve bottles of beer.</p>
        <p>At least four of Carolina's scarfs are blue. At least ve of Carolina's scarfs are blue.
Thomas has read at least three books. Thomas has read at least four books.</p>
        <p>At most four computers in the lab are broken. At most three computers in the lab are broken.
Andrea baked at most three pizzas. Andrea baked at most two pizzas.</p>
        <p>Not fewer than four professors attended the meeting. Not fewer than ve professors attended the
meeting.</p>
        <p>Hans had not fewer than three glasses of wine. Hans had not fewer than four glasses of wine.
Not more than four people have applied for this job. Not more than three people have applied for
this job.</p>
        <p>Natalie wrote not more than three exercises. Natalie wrote not more than two exercises.
Four or more than four girls in the class are good in arts. Five or more than ve girls in the class
are good in arts.</p>
        <p>Christina's cat gave birth to three or more than three kittens. Christina's cat gave birth to four or
more than four kittens.</p>
        <p>Four or fewer than four students failed in the exam. Three or more than three students failed in the
exam.</p>
        <p>Tanja trains three or fewer than three times a week. Tanja trains two or fewer than two times a
week.</p>
        <p>Four new students joined the chess club this week. Five new students joined the chess club this week.
Stephanie baked two cakes for her birthday. Stephanie baked six cakes for her birthday.
Six members of the library club came to the meeting. Seven member of the library club came to the
meeting.</p>
        <p>Frank gave his mother three roses. Frank gave his mother eight roses.</p>
        <p>Not more than three children have done their homework for today. At most three children have done
their homework for today.</p>
        <p>At most three girls took part in the maths competition. Not more than three girls took part in the
maths competition.</p>
        <p>Erika has not more than four necklaces. Erika has at most four necklaces.</p>
        <p>Lena takes at most four courses at the university. Lena takes not more than four courses at the
university.</p>
        <p>Not fewer than three new animals were born in the city zoo. At least three new animals were born
in the city zoo.</p>
        <p>At least three exotic three have died in our botanic garden. Not fewer than three exotic threes have
died in our botanic garden.</p>
        <p>Daniel plays not fewer than four times a week football. Daniel plays at least four times a week
football.</p>
        <p>Albert has at least four exams this semester. Albert has not fewer than four exams this semester.</p>
      </sec>
    </sec>
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