16 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] |
| 13832 | Natural deduction shows the heart of reasoning (and sequent calculus is just a tool) [Gentzen, by Hacking] |
| 6007 | If you know your father, but don't recognise your father veiled, you know and don't know the same person [Eubulides, by Dancy,R] |
| 6006 | If you say truly that you are lying, you are lying [Eubulides, by Dancy,R] |
| 6008 | Removing one grain doesn't destroy a heap, so a heap can't be destroyed [Eubulides, by Dancy,R] |
| 10067 | Gentzen proved the consistency of arithmetic from assumptions beyond arithmetic [Gentzen, by Musgrave] |
| 20937 | The state should produce higher civilisations for all, in tune with the economic apparatus [Gramsci] |
| 20935 | Eventually political parties lose touch with the class they represent, which is dangerous [Gramsci] |
| 20936 | Caesarism emerges when two forces in society are paralysed in conflict [Gramsci] |
| 20941 | Totalitarian parties cut their members off from other cultural organisations [Gramsci] |
| 20939 | What is the function of a parliament? Does it even constitute a part of the State structure? [Gramsci] |
| 20938 | Liberalism's weakness is its powerful rigid bureaucracy [Gramsci] |
| 20940 | Perfect political equality requires economic equality [Gramsci] |