10 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] |
| 468 | Musical performance can reveal a range of virtues [Damon of Ath.] |
| 23395 | Mohists desire wealth, population and social order as the best consequences [Mozi, by Norden] |
| 23394 | If people regarded other states as they did their own, they would never attack them [Mozi] |
| 23396 | Mozi condemns partiality, which is the cause of all the great harms in the world [Mozi] |
| 23397 | Those who are against impartiality still prefer impartial protectors [Mozi] |