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'fragments/reports', 'Letters to Jourdain' and 'The Philosophy of Mathematics'
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5 ideas
5. Theory of Logic / D. Assumptions for Logic / 2. Excluded Middle
9195
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Intuitionists reject excluded middle, not for a third value, but for possibility of proof [Dummett]
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5. Theory of Logic / F. Referring in Logic / 1. Naming / a. Names
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In 'Etna is higher than Vesuvius' the whole of Etna, including all the lava, can't be the reference [Frege]
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5. Theory of Logic / F. Referring in Logic / 1. Naming / b. Names as descriptive
8448
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Any object can have many different names, each with a distinct sense [Frege]
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5. Theory of Logic / G. Quantification / 5. Second-Order Quantification
9186
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First-order logic concerns objects; second-order adds properties, kinds, relations and functions [Dummett]
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5. Theory of Logic / I. Semantics of Logic / 3. Logical Truth
9187
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Logical truths and inference are characterized either syntactically or semantically [Dummett]
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