12 ideas
11022 | Gentzen introduced a natural deduction calculus (NK) in 1934 [Gentzen, by Read] |
11065 | The inferential role of a logical constant constitutes its meaning [Gentzen, by Hanna] |
11023 | The logical connectives are 'defined' by their introduction rules [Gentzen] |
11213 | Each logical symbol has an 'introduction' rule to define it, and hence an 'elimination' rule [Gentzen] |
10067 | Gentzen proved the consistency of arithmetic from assumptions beyond arithmetic [Gentzen, by Musgrave] |
14348 | An 'antidote' allows a manifestation to begin, but then blocks it [Corry] |
14347 | A 'finkish' disposition is one that is lost immediately after the appropriate stimulus [Corry] |
14350 | If a disposition is never instantiated, it shouldn't be part of our theory of nature [Corry] |
14351 | Maybe an experiment unmasks an essential disposition, and reveals its regularities [Corry] |
13304 | Learned men gain more in one day than others do in a lifetime [Posidonius] |
14346 | Dispositional essentialism says fundamental laws of nature are strict, not ceteris paribus [Corry] |
20820 | Time is an interval of motion, or the measure of speed [Posidonius, by Stobaeus] |