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'', 'The Scientific Image' and 'Mathematical Logic (revised)'
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5 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 / E. Structures of Logic / 2. Logical Connectives / a. Logical connectives
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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11212
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The sense of a connective comes from primitively obvious rules of inference [Rumfitt]
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5. Theory of Logic / E. Structures of Logic / 4. Variables in Logic
12221
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'Corner quotes' (quasi-quotation) designate 'whatever these terms designate' [Quine]
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5. Theory of Logic / F. Referring in Logic / 1. Naming / f. Names eliminated
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We might do without names, by converting them into predicates [Quine, by Kirkham]
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