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Ideas for
'', 'Modality' and 'The Wanderer and his Shadow'
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5 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 / E. Structures of Logic / 2. Logical Connectives / a. Logical connectives
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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11212
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The sense of a connective comes from primitively obvious rules of inference [Rumfitt]
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5. Theory of Logic / G. Quantification / 5. Second-Order Quantification
5740
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Second-order logic needs second-order variables and quantification into predicate position [Melia]
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5. Theory of Logic / J. Model Theory in Logic / 1. Logical Models
5741
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If every model that makes premises true also makes conclusion true, the argument is valid [Melia]
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