Combining Texts

Ideas for 'No Understanding without Explanation', 'Some Puzzles of Ground' and 'Introducing the Philosophy of Mathematics'

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3 ideas

4. Formal Logic / E. Nonclassical Logics / 2. Intuitionist Logic

8708	Double negation elimination is not valid in intuitionist logic [Friend]

4. Formal Logic / E. Nonclassical Logics / 3. Many-Valued Logic

14263

Strong Kleene disjunction just needs one true disjunct; Weak needs the other to have some value [Fine,K]

4. Formal Logic / E. Nonclassical Logics / 6. Free Logic

8694	Free logic was developed for fictional or non-existent objects [Friend]