8 ideas
7460 | The great moments are the death of Aristotle, Machiavelli, and Romanticism [Berlin, by Watson] |
11022 | Gentzen introduced a natural deduction calculus (NK) in 1934 [Gentzen, by Read] |
9390 | Logic guides thinking, but it isn't a substitute for it [Rumfitt] |
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] |
9389 | Vague membership of sets is possible if the set is defined by its concept, not its members [Rumfitt] |