7 ideas
13342 | Carnap defined consequence by contradiction, but this is unintuitive and changes with substitution [Tarski on Carnap] |
13251 | Each person is free to build their own logic, just by specifying a syntax [Carnap] |
15941 | For intuitionists excluded middle is an outdated historical convention [Brouwer] |
18247 | Brouwer saw reals as potential, not actual, and produced by a rule, or a choice [Brouwer, by Shapiro] |
2602 | What experience could prove 'If a=c and b=c then a=b'? [Descartes] |
2600 | The mind's innate ideas are part of its capacity for thought [Descartes] |
2601 | Qualia must be innate, because physical motions do not contain them [Descartes] |