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'', 'Intellectual Autobiography' and 'The Concept of Logical Consequence'
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9 ideas
5. Theory of Logic / A. Overview of Logic / 1. Overview of Logic
11211
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If a sound conclusion comes from two errors that cancel out, the path of the argument must matter [Rumfitt]
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5. Theory of Logic / B. Logical Consequence / 1. Logical Consequence
14181
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Validity is where either the situation or the interpretation blocks true premises and false conclusion [Etchemendy, by Read]
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14180
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Etchemendy says fix the situation and vary the interpretation, or fix interpretations with varying situations [Etchemendy, by Read]
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5. Theory of Logic / D. Assumptions for Logic / 4. Identity in Logic
18897
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Predicate logic has to spell out that its identity relation '=' is an equivalent relation [Sommers]
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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
11212
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The sense of a connective comes from primitively obvious rules of inference [Rumfitt]
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11210
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Standardly 'and' and 'but' are held to have the same sense by having the same truth table [Rumfitt]
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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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