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'Writing the Book of the World', 'Building Blocks of Mathematical Logic' and 'Physical Causation'
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5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / a. Logical connectives
15019
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Define logical constants by role in proofs, or as fixed in meaning, or as topic-neutral [Sider]
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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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