9 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] |
17527 | Causation seems to be an innate concept (or acquired very early) [Bird] |
468 | Musical performance can reveal a range of virtues [Damon of Ath.] |
17528 | The dispositional account explains causation, as stimulation and manifestation of dispositions [Bird] |
17526 | The counterfactual approach makes no distinction between cause and pre-condition [Bird] |