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
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Any two states are logically linked, by being entailed by their conjunction [Harman]
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12595
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We have a theory of logic (implication and inconsistency), but not of inference or reasoning [Harman]
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5. Theory of Logic / A. Overview of Logic / 6. Classical Logic
3098
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Deductive logic is the only logic there is [Harman]
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5. Theory of Logic / B. Logical Consequence / 5. Modus Ponens
3094
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You don't have to accept the conclusion of a valid argument [Harman]
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5. Theory of Logic / E. Structures of Logic / 1. Logical Form
3084
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Our underlying predicates represent words in the language, not universal concepts [Harman]
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3080
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Logical form is the part of a sentence structure which involves logical elements [Harman]
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3081
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A theory of truth in a language must involve a theory of logical form [Harman]
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5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / d. and
12597
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I might accept P and Q as likely, but reject P-and-Q as unlikely [Harman]
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5. Theory of Logic / E. Structures of Logic / 6. Relations in Logic
9561
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The mathematics of relations is entirely covered by ordered pairs [Chihara]
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5. Theory of Logic / K. Features of Logics / 2. Consistency
9552
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Sentences are consistent if they can all be true; for Frege it is that no contradiction can be deduced [Chihara]
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