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Single Idea 12597

[filed under theme 5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / d. and ]

Full Idea

Principles of implication imply there is not a purely probabilistic rule of acceptance for belief. Otherwise one might accept P and Q, without accepting their conjunction, if the conjuncts have a high probability, but the conjunction doesn't.

Gist of Idea

I might accept P and Q as likely, but reject P-and-Q as unlikely

Source

Gilbert Harman ((Nonsolipsistic) Conceptual Role Semantics [1987], 12.2.2)

Book Ref

Harman,Gilbert: 'Reasoning Meaning and Mind' [OUP 1999], p.213

A Reaction

[Idea from Scott Soames] I am told that my friend A has just won a very big lottery prize, and am then told that my friend B has also won a very big lottery prize. The conjunction seems less believable; I begin to suspect a conspiracy.

The 16 ideas from '(Nonsolipsistic) Conceptual Role Semantics'

12588 Meaning from use of thoughts, constructed from concepts, which have a role relating to reality [Harman]
12589 Some regard conceptual role semantics as an entirely internal matter [Harman]
12590 Take meaning to be use in calculation with concepts, rather than in communication [Harman]
12591 Mastery of a language requires thinking, and not just communication [Harman]
12592 Concepts in thought have content, but not meaning, which requires communication [Harman]
12593 The use theory attaches meanings to words, not to sentences [Harman]
12594 If one proposition negates the other, which is the negative one? [Harman]
12596 Reasoning aims at increasing explanatory coherence [Harman]
12595 We have a theory of logic (implication and inconsistency), but not of inference or reasoning [Harman]
12597 I might accept P and Q as likely, but reject P-and-Q as unlikely [Harman]
12598 Reality is the overlap of true complete theories [Harman]
12599 Reason conservatively: stick to your beliefs, and prefer reasoning that preserves most of them [Harman]
12601 The way things look is a relational matter, not an intrinsic matter [Harman]
12600 The content of thought is relations, between mental states, things in the world, and contexts [Harman]
12602 There is no natural border between inner and outer [Harman]
12603 We can only describe mental attitudes in relation to the external world [Harman]