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'works', 'A Mathematical Introduction to Logic (2nd)' and 'Writing the Book of the World'
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5. Theory of Logic / B. Logical Consequence / 1. Logical Consequence
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Modal accounts of logical consequence are simple necessity, or essential use of logical words [Sider]
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5. Theory of Logic / B. Logical Consequence / 2. Types of Consequence
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Validity is either semantic (what preserves truth), or proof-theoretic (following procedures) [Enderton]
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