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Ideas for 'fragments/reports', 'On the Principles of Indiscernibles' and 'Vagueness and Contradiction'

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5. Theory of Logic / D. Assumptions for Logic / 1. Bivalence

9119	No attempt to deny bivalence has ever been accepted [Sorensen]

5. Theory of Logic / D. Assumptions for Logic / 2. Excluded Middle

6023	Every proposition is either true or false [Chrysippus, by Cicero]