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] |
19355 | The soul doesn't understand many of its own actions, if perceptions are confused and desires buried [Leibniz] |
19350 | We should say that body is mechanism and soul is immaterial, asserting their independence [Leibniz] |
468 | Musical performance can reveal a range of virtues [Damon of Ath.] |
19356 | Minds unconsciously count vibration beats in music, and enjoy it when they coincide [Leibniz] |