On Cancellation Peter Hanks University of Minnesota [email protected]

1

The Fregean picture of propositional content thoughts / propositions









judgment

Russell is a philosopher

assertion

Russell is a philosopher

entertainment

subject

2

Key features of the Fregean picture •

Propositions are the primary bearers of truth-conditions. Judgments and assertions inherit truth-conditions from propositions. •

•

•

Propositions are a source of truth-conditions

Content-Force Distinction •

Taxonomic: speech acts with different forces can share the same propositional content

•

Constitutive: no force elements in propositions

Entertainment: an attitude (e.g. a belief) can be factored into a neutral component (entertainment) and a non-neutral component •

Same for speech acts: a speech act can be factored into a neutral component (expression of a proposition) and a non-neutral component 3

Problem for the Fregean picture: the unity of the proposition

•

How do propositions get their truth-conditions?

•

In trying to give an answer, the Fregean picture bars us from appealing to what we do in making judgments or assertions.

•

Frege and Russell both saw the need to explain how propositions have truthconditions. Because of their commitment to the content-force distinction, they were forced to appeal to relations between the internal constituents of propositions — saturation for Frege, relations-that-relate for Russell. Both approaches are failures.

•

Maybe no explanation is required? Maybe it is a primitive, unexplainable fact that propositions have truth-conditions?

4

Going primitive •

Suppose we say it is primitive that propositions have truth-conditions.

•

Then it’s difficult to also say that propositions have constituents or parts. •

Presumably, something about its constituents and their relation to one another should explain why a proposition has its truth-conditions. But we’re not giving an explanation for why propositions have truth-conditions.

•

Furthermore, if propositions have constituents and it’s primitive that they have truthconditions, then there would be an unexplained harmony between truth-conditions and constituents. (Merricks, 2015) is true iff Russell is a philosopher. has Russell and the property of being a philosopher as constituents.

•

If we go primitive about the truth-conditions of propositions then we should deny that propositions have constituents or parts. Propositions must be simple and sui generis.

•

Then entertainment must also primitive and unexplainable. Entertainment cannot be an operation of some kind on the constituents of propositions, since they don’t have constituents.

•

Judgment also has to be primitive. Judgment cannot be an operation performed on the constituents of a proposition, and it can’t be taking (i.e. judging) a proposition to be true, on pain of regress. • judging that p = judging that p is true = judging that is true = … 5

Going primitive (continued) Russell is a philosopher judgment

subject

•

Why is this judgment true iff Russell is a philosopher?

•

There is a simple, sui generis proposition that has these truthconditions as a matter of primitive, unexplainable fact.

•

The subject bears primitive entertainment and judgment relations to this proposition.

•

This answer strikes me as philosophically unsatisfying (and rather bizarre). At the very least, we should be motivated to look for a different explanation.

6

Classificatory picture of propositional content

type = propositional content

assertion

subject

⊢

Russell is a philosopher

• refers to Russell • expresses the property of being a philosopher • predicates this property of Russell

7

Classificatory picture of propositional content

⊢

Russell is a philosopher assertion

⊢

= predication

?

Is Russell a philosopher? question

? = asking

!

Russell, be a philosopher! order

! = ordering

8

The varieties of content

Type

satisfaction conditions

direction of fit

sentence mood

embedded clauses

⊢

truth-conditions

word-to-world

declarative

that-clauses

?

answer-hood conditions

word-to-word

interrogative

whether- and wh-clauses

!

fulfillment conditions

world-to-word

imperative

infinitive clauses

9

Classificatory picture of propositional content •

Acts of predicating/asking/ordering are primary bearers of satisfaction conditions. Propositions inherit their satisfaction conditions from these actions. •

•

•

We use propositions to classify and individuate our thoughts and utterances. Propositions are types and types are devices of classification. To give the propositional content of a mental state or utterance is to classify it under a type.

No Content-Force Distinction •

Speech acts with different forces have different contents.

•

Force elements in propositions.

No entertainment. No “propositional acts”. No factoring into neutral / non-neutral components.

10

Conditionals and disjunctions •

An utterance of ‘if p then q’ or ‘p or q’ is neither an assertion that p nor an assertion that q, and neither commits the speaker to p or q.

•

No change to the contents of p and q when used inside a conditional or disjunction.

The contents of p and q must not contain assertion. Frege

The contents of p and q contain an assertoric element, but this element is cancelled or overridden when p and q are used inside a conditional or disjunction.

11

Cancellation ⊢<<~⊢, ~⊢, if-then> If Russell is right then Frege is wrong.

~⊢ = cancelled predication if-then = type of act of expressing a conditional relation on propositions

12

Disjunction and conjunction ⊢<<~⊢, ~⊢, disj> Russell is right or Frege is wrong.

disj = type of act of expressing a disjunctive relation on propositions two propositions, p and q, bear this disjunctive relation iff either p is true or q is true

⊢<< ⊢, ⊢, conj>

Russell is right and Frege is wrong.

conj = type of act of expressing a conjunctive relation on propositions two propositions, p and q, bear this disjunctive relation iff p is true and q is true 13

The actor “When playing his part the actor is not asserting anything; nor is he lying, even if he says something of whose falsehood he is convinced.” - Frege, “Thoughts” ~⊢

Russell is a philosopher. actor •

The actor performs an act of predication in a context in which conventions about stage-acting prevent an act of predication from counting as a full-fledged assertion.

•

Call this a cancellation context. In cancellation contexts, acts of predication do not count as assertions.

•

Cancelled predication = an act of predication that takes place in a cancellation context.

•

Uses of ‘if’ and ‘or’ create cancellation contexts. 14

Football analogy •

In American football, the referees allow play to continue even after the defensive team has committed a penalty.

•

Suppose this happens and the defense tackles the quarterback inside the end zone.

•

Normally this would count as a safety and the defense would get 2 points. But because of the penalty the play does not count as a safety.

•

Cancellation context: the defense tackles the quarterback in the end zone in a context in which doing so does not count as a safety.

•

Our language game has something similar. In a cancellation context, the subject performs an act of predication in a context in which doing so does not count as an assertion.

•

I got this wrong in my 2011 paper in Mind: •

“When a speaker assertively utters this sentence [‘George is clever or Karla is foolish’] she neither asserts that George is clever nor that Karla is foolish, and she neither predicates cleverness of George nor foolishness of Karla,” (20).

15

Chess analogy •

A and B are playing a game of chess. B is a beginner.

•

In the course of the game, B asks A to demonstrate how the knight moves. A moves her knight in the usual way, by way of demonstration.

•

This move does not count as A’s turn in the game. She is not committed to placing her knight on the square where it landed.

•

Cancellation context: A moves her knight in a context in which such a move does not count as her turn in the game (a demonstration context). This move does not carry any of the normal consequences and commitments.

•

Cancelled predication is similar. In an act of cancelled predication, someone performs a standard, normal act of predication, but because of the cancellation context this act does not have its usual consequences and commitments.

16

Cancellation ⊢<<~⊢, ~⊢, if-then> If Russell is right then Frege is wrong.

•

The speaker’s use of ‘if’ creates a cancellation context for the acts of predication she performs in uttering the antecedent and consequent.

•

‘If’ signals to the hearer that the following acts of predication are not assertions.

•

The outermost predication operator is uncanceled. In a token of this proposition, a speaker predicates a conditional relation of the propositions that Russell is right and Frege is wrong.

17

Canceling and Non-cancelling expressions Two varieties of sentence embedding expressions: cancelling and noncancelling. Cancelling expressions create a cancellation context, non-cancelling expressions don’t. Examples:

Cancelling if or not possible believes

Non-cancelling and true (it’s true that) necessary knows ?

18

Factive / Non-factive Maybe the non-cancelling / cancelling distinction can explain the factive / non-factive disintinction? Non-factive operators : cancelling Factive operators : non-cancelling Problem

? S knows whether Russell is a philosopher.

19

Target-shifting ⊢↑ <<~⊢, ~⊢, if-then> ⊢

⊢

conditional relation predicated of these two types (propositions)

If Russell is right then Frege is wrong.

~[ Russell

⊢↑

]

~[

] Frege

Target-shifted predication Predication that is targeted at a type of action performed by the subject, instead of something the subject referred to.

20

Modus ponens

⊢↑ <<~⊢, ~⊢, if-then>

If Russell is right then Frege is wrong. ⊢

Russell is right. ⊢

Frege is wrong.

21

Negation, double negation, and double cancellation ⊢↑<~⊢, not-true> It’s not the case that Russell is right.

Two cancellation operators do not cancel each other out. Double cancellation is not no cancellation.

⊢↑<~⊢↑<~⊢, not-true>, not-true>

It’s not the case that it’s not the case that Russell is right.

22

Double negation (again) ⊢↑<~⊢↑<~⊢, not-true>, not-true> It’s not the case that it’s not the case that Russell is right.

⊢

These two propositions are truthconditionally equivalent. The difference is a matter of what the speaker asserts in performing tokens of these types.

Russell is right.

23

De Morgan’s laws ⊢↑<~⊢↑<<⊢, ⊢ conj>, not-true>

It’s not the case Russell is right and Frege is wrong.

⊢↑<~⊢↑<~⊢, not-true>, ~⊢↑<~⊢, not-true>>, disj>

Either Russell is not right or Frege is not wrong.

24

Property negation ⊢↑<~⊢, not-true> It’s not the case that Russell is right.

⊢> Russell is not right.

not = type of act of expressing a function from properties to negative properties = type of act of expressing the negative property of not being right

25

Predication, sorting, and negative properties •

Predication as sorting: to predicate a property of an object is to sort that object into a group according to a rule given by a property.

•

Marbles: imagine you have a pile of marbles, and you’re going to sort out the green ones. Two ways to do it:

•

•

Pick out the green marbles and put them in a pile. Sorting according to the property of being green.

•

Pick out the non-green marbles and put them in a pile. Sorting according to the negative property of not being green.

Properties (positive or negative) = rules for sorting.

26

Denial and anti-predication

Is Russell right?

⊣ No.

⊣

Anti-predication

Anti-predication = unsorting an object from a group that has been sorted according to a property

27

Negation and denial

It’s not the case that Russell is right.

⊢>

Russell is not right.

Is Russell right?

⊢↑<~⊢, not-true>

No.

⊣

28

Conj and and ⊢<< ⊢, ⊢, conj> ⊢, >

Russell is right and Frege is wrong.

and = type of act of expressing a function from pairs of properties to conjunctive relations. This function maps the properties RIGHT and WRONG to the relation: __-IS-RIGHT-AND-__-IS-WRONG

29

Disj and or ⊢<< ~⊢, ~⊢, disj> ⊢, >

Russell is right or Frege is wrong.

or = type of act of expressing a function from pairs of properties to disjunctive relations. This function maps the properties RIGHT and WRONG to the relation: __-IS-RIGHT-OR-__-IS-WRONG

30

And-d and or-d ⊢>

Russell is right and wrong. and-d = type of act of expressing a function from pairs of properties to 1-place conjunctive properties, e.g. ___-IS-RIGHT-ANDWRONG.

⊢>

Russell is right or wrong.

or-d = type of act of expressing a function from pairs of properties to 1-place disjunctive properties, e.g. __-IS-RIGHT-OR-WRONG. 31

C

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PET E R H ANKS

PROPOSITIONAL CONTENT 2

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On Cancellation

Football analogy. • In American football, the referees allow play to continue even after the defensive team has committed a penalty. • Suppose this happens and the defense tackles the quarterback inside the end zone. • Normally this would count as a safety and the defense would get 2 points. But because of the penalty the ...
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