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Ideas for
'What is Logic?st1=Ian Hacking', 'Introduction to the Theory of Logic' and 'Facts and Propositions'
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3 ideas
5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / a. Logical connectives
13837
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With a pure notion of truth and consequence, the meanings of connectives are fixed syntactically [Hacking]
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5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / b. Basic connectives
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Propositional logic just needs ¬, and one of ∧, ∨ and → [Zalabardo]
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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]
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