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'', 'The Meditations (To Himself)' and 'On the Syllogism IV'
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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 / 6. Relations in Logic
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De Morgan found inferences involving relations, which eluded Aristotle's syllogistic [De Morgan, by Hart,WD]
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17744
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De Morgan started the study of relations and their properties [De Morgan, by Walicki]
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