Ideas from 'On the General Idea of Proof Theory' by Dag Prawitz [1974], by Theme Structure
[found in 'A Philosophical Companion to First-Order Logic' (ed/tr Hughes,R.I.G.) [Hackett 1993,0-87220-181-3]].
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5. Theory of Logic / B. Logical Consequence / 1. Logical Consequence
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Logical consequence isn't a black box (Tarski's approach); we should explain how arguments work
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5. Theory of Logic / J. Model Theory in Logic / 1. Logical Models
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Model theory looks at valid sentences and consequence, but not how we know these things
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