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'works', 'Practical Necessity' and 'The Concept of Logical Consequence'
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2 ideas
5. Theory of Logic / B. Logical Consequence / 1. Logical Consequence
18812
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Split out the logical vocabulary, make an assignment to the rest. It's logical if premises and conclusion match [Tarski, by Rumfitt]
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5. Theory of Logic / B. Logical Consequence / 4. Semantic Consequence |=
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X follows from sentences K iff every model of K also models X [Tarski]
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