Combining Texts

Ideas for 'fragments/reports', 'The Origin of Forms and Qualities' and 'Identity and Existence in Logic'

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4 ideas

5. Theory of Logic / B. Logical Consequence / 5. Modus Ponens

8078	Modus ponens is one of five inference rules identified by the Stoics [Chrysippus, by Devlin]

5. Theory of Logic / D. Assumptions for Logic / 2. Excluded Middle

6023	Every proposition is either true or false [Chrysippus, by Cicero]

5. Theory of Logic / G. Quantification / 5. Second-Order Quantification

18763

Basic variables in second-order logic are taken to range over subsets of the individuals [Anderson,CA]

5. Theory of Logic / G. Quantification / 7. Unorthodox Quantification

18771

Stop calling ∃ the 'existential' quantifier, read it as 'there is...', and range over all entities [Anderson,CA]