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Ideas for 'fragments/reports', 'Mathematical Logic (revised)' and 'Building Blocks of Mathematical Logic'

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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]

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'Corner quotes' (quasi-quotation) designate 'whatever these terms designate' [Quine]