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Ideas for 'fragments/reports', 'Introducing the Philosophy of Mathematics' and '21: Book of Ecclesiastes'

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2 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 / 6. Free Logic

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