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Ideas for 'Difference and Repetition', 'The Logical Basis of Metaphysics' and 'Building Blocks of Mathematical Logic'

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

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Classical negation is circular, if it relies on knowing negation-conditions from truth-conditions [Dummett]

5. Theory of Logic / E. Structures of Logic / 4. Variables in Logic

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Variables are auxiliary notions, and not part of the 'eternal' essence of logic [Schönfinkel]