12 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] |
| 10067 | Gentzen proved the consistency of arithmetic from assumptions beyond arithmetic [Gentzen, by Musgrave] |
| 24071 | Markets are transparent, with known prices and activity, and minimal profits [Davies,W] |
| 24073 | Capitalists use their exceptional power to impose their own rules, and make the state their ally [Davies,W] |
| 24070 | Economies have material, economic and capitalist layers [Davies,W] |
| 24074 | Capitalism must mainly rely either on the labour market, or on the financial markets [Davies,W] |
| 24072 | Capitalism is the anti-market, with opacity, monopolies, powers, exceptional profits and wealth [Davies,W] |
| 7810 | The 'Eumenides' of Aeschylus shows blood feuds replaced by law [Aeschylus, by Grayling] |