14 ideas
19441 | All philosophies presuppose their historical moment, and arise from it [Feuerbach] |
19442 | I don't study Plato for his own sake; the primary aim is always understanding [Feuerbach] |
19444 | Each proposition has an antithesis, and truth exists as its refutation [Feuerbach] |
19445 | A dialectician has to be his own opponent [Feuerbach] |
19443 | Truth forges an impersonal unity between people [Feuerbach] |
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] |
19446 | To our consciousness it is language which looks unreal [Feuerbach] |
9389 | Vague membership of sets is possible if the set is defined by its concept, not its members [Rumfitt] |
19447 | The Absolute is the 'and' which unites 'spirit and nature' [Feuerbach] |