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Ideas for 'works', 'On Euclidean Geometry' and 'Modal Realism at Work: Properties'

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2 ideas

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]

5. Theory of Logic / K. Features of Logics / 1. Axiomatisation

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The truth of an axiom must be independently recognisable [Frege]