Combining Texts

Ideas for 'The Courtier and the Heretic', 'Frege' and 'Identity and Existence in Logic'

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2 ideas

4. Formal Logic / B. Propositional Logic PL / 1. Propositional Logic

7726	Aristotelian logic dealt with inferences about concepts, and there were also proposition inferences [Weiner]

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

18767

Free logics has terms that do not designate real things, and even empty domains [Anderson,CA]