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

1312	If everything is and isn't then everything is true, and a midway between true and false makes everything false [Aristotle on Heraclitus]

5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / c. not

21777

Negation of negation doubles back into a self-relationship [Hegel, by Houlgate]