more from Gilbert Harman

Single Idea 3094

[catalogued under 5. Theory of Logic / B. Logical Consequence / 5. Modus Ponens]

Full Idea

We may say "From P and If-P-then-Q, infer Q" (modus ponens), but there is no rule of acceptance to say that we should accept Q. Maybe we should stop believing P or If-P-then-Q rather than believe Q.

Gist of Idea

You don't have to accept the conclusion of a valid argument


Gilbert Harman (Thought [1973], 10.1)

Book Reference

Harman,Gilbert: 'Thought' [Princeton 1977], p.157