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'fragments/reports', 'Intensions Revisited' and 'Logicism and Ontological Commits. of Arithmetic'
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5 ideas
5. Theory of Logic / A. Overview of Logic / 7. Second-Order Logic
10015
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Higher-order logic may be unintelligible, but it isn't set theory [Hodes]
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5. Theory of Logic / B. Logical Consequence / 5. Modus Ponens
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Modus ponens is one of five inference rules identified by the Stoics [Chrysippus, by Devlin]
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5. Theory of Logic / D. Assumptions for Logic / 2. Excluded Middle
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Every proposition is either true or false [Chrysippus, by Cicero]
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5. Theory of Logic / D. Assumptions for Logic / 4. Identity in Logic
10011
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Identity is a level one relation with a second-order definition [Hodes]
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5. Theory of Logic / I. Semantics of Logic / 1. Semantics of Logic
10016
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When an 'interpretation' creates a model based on truth, this doesn't include Fregean 'sense' [Hodes]
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