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Ideas for 'works', 'Begriffsschrift' and 'A Pragmatic Conception of the A Priori'

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4 ideas

5. Theory of Logic / A. Overview of Logic / 1. Overview of Logic

7728	Frege has a judgement stroke (vertical, asserting or judging) and a content stroke (horizontal, expressing) [Frege, by Weiner]

16881

The laws of logic are boundless, so we want the few whose power contains the others [Frege]

9358	There are several logics, none of which will ever derive falsehoods from truth [Lewis,CI]

5. Theory of Logic / A. Overview of Logic / 2. History of Logic

7622	In 1879 Frege developed second order logic [Frege, by Putnam]