Combining Philosophers
Ideas for H.Putnam/P.Oppenheim, Fred Sommers and Gerhard Gentzen
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6 ideas
5. Theory of Logic / E. Structures of Logic / 1. Logical Form
18893
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Translating into quantificational idiom offers no clues as to how ordinary thinkers reason [Sommers]
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5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / a. Logical connectives
11065
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The inferential role of a logical constant constitutes its meaning [Gentzen, by Hanna]
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11023
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The logical connectives are 'defined' by their introduction rules [Gentzen]
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11213
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Each logical symbol has an 'introduction' rule to define it, and hence an 'elimination' rule [Gentzen]
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5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / c. not
18903
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Sommers promotes the old idea that negation basically refers to terms [Sommers, by Engelbretsen]
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5. Theory of Logic / E. Structures of Logic / 7. Predicates in Logic
18894
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Predicates form a hierarchy, from the most general, down to names at the bottom [Sommers]
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