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9 ideas
5. Theory of Logic / A. Overview of Logic / 1. Overview of Logic
11211
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If a sound conclusion comes from two errors that cancel out, the path of the argument must matter [Rumfitt]
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5. Theory of Logic / D. Assumptions for Logic / 4. Identity in Logic
18759
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Identity is invariant under arbitrary permutations, so it seems to be a logical term [Tarski, by McGee]
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5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / a. Logical connectives
11212
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The sense of a connective comes from primitively obvious rules of inference [Rumfitt]
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11210
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Standardly 'and' and 'but' are held to have the same sense by having the same truth table [Rumfitt]
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5. Theory of Logic / F. Referring in Logic / 1. Naming / c. Names as referential
10823
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A name denotes an object if the object satisfies a particular sentential function [Tarski]
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5. Theory of Logic / I. Semantics of Logic / 1. Semantics of Logic
18756
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Tarski built a compositional semantics for predicate logic, from dependent satisfactions [Tarski, by McGee]
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19313
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Tarksi invented the first semantics for predicate logic, using this conception of truth [Tarski, by Kirkham]
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5. Theory of Logic / J. Model Theory in Logic / 1. Logical Models
16323
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The object language/ metalanguage distinction is the basis of model theory [Tarski, by Halbach]
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5. Theory of Logic / L. Paradox / 6. Paradoxes in Language / a. The Liar paradox
8940
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Tarski avoids the Liar Paradox, because truth cannot be asserted within the object language [Tarski, by Fisher]
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