4 ideas
15941 | For intuitionists excluded middle is an outdated historical convention [Brouwer] |
13832 | Natural deduction shows the heart of reasoning (and sequent calculus is just a tool) [Gentzen, by Hacking] |
18247 | Brouwer saw reals as potential, not actual, and produced by a rule, or a choice [Brouwer, by Shapiro] |
19087 | The meaning or purport of a symbol is all the rational conduct it would lead to [Peirce] |