more from Gilbert Harman

Single Idea 12597

[catalogued under 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


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

Book Reference

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.