Combining Philosophers

Ideas for Numenius, Gilbert Harman and Charles Chihara

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10 ideas

5. Theory of Logic / A. Overview of Logic / 1. Overview of Logic

3093	Any two states are logically linked, by being entailed by their conjunction [Harman]

12595

We have a theory of logic (implication and inconsistency), but not of inference or reasoning [Harman]

5. Theory of Logic / A. Overview of Logic / 6. Classical Logic

3098	Deductive logic is the only logic there is [Harman]

5. Theory of Logic / B. Logical Consequence / 5. Modus Ponens

3094	You don't have to accept the conclusion of a valid argument [Harman]

5. Theory of Logic / E. Structures of Logic / 1. Logical Form

3084	Our underlying predicates represent words in the language, not universal concepts [Harman]

3080	Logical form is the part of a sentence structure which involves logical elements [Harman]

3081	A theory of truth in a language must involve a theory of logical form [Harman]

5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / d. and

12597

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

5. Theory of Logic / E. Structures of Logic / 6. Relations in Logic

9561	The mathematics of relations is entirely covered by ordered pairs [Chihara]

5. Theory of Logic / K. Features of Logics / 2. Consistency

9552	Sentences are consistent if they can all be true; for Frege it is that no contradiction can be deduced [Chihara]