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5 ideas
5. Theory of Logic / D. Assumptions for Logic / 2. Excluded Middle
21668
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Epicurus rejected excluded middle, because accepting it for events is fatalistic [Epicurus, by Cicero]
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5. Theory of Logic / E. Structures of Logic / 1. Logical Form
4730
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For Aristotle, the subject-predicate structure of Greek reflected a substance-accident structure of reality [Aristotle, by O'Grady]
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5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / e. or
21676
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Epicureans say disjunctions can be true whiile the disjuncts are not true [Epicurus, by Cicero]
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5. Theory of Logic / E. Structures of Logic / 6. Relations in Logic
13501
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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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