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Ideas for 'What is Logic?st1=Ian Hacking', 'Realism and Anti-Realism' and 'Matter and Motion Cannot Think'

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5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / a. Logical connectives

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With a pure notion of truth and consequence, the meanings of connectives are fixed syntactically [Hacking]

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

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Perhaps variables could be dispensed with, by arrows joining places in the scope of quantifiers [Hacking]