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] |
| 10067 | Gentzen proved the consistency of arithmetic from assumptions beyond arithmetic [Gentzen, by Musgrave] |
| 15642 | If kinds depend only on what can be observed, many underlying essences might produce the same kind [Eagle] |
| 15645 | Nominal essence are the observable properties of things [Eagle] |
| 15643 | Nominal essence mistakenly gives equal weight to all underlying properties that produce appearances [Eagle] |
| 3978 | Associations are held to connect Ideas together in the way the world is connected together [Fodor] |
| 3976 | Intentional science needs objects with semantic and causal properties, and which obey laws [Fodor] |
| 3980 | Intentional states and processes may be causal relations among mental symbols [Fodor] |
| 3981 | Most psychological properties seem to be multiply realisable [Fodor] |
| 3975 | Folk psychology explains behaviour by reference to intentional states like belief and desire [Fodor] |
| 3982 | How could the extrinsic properties of thoughts supervene on their intrinsic properties? [Fodor] |
| 15641 | Kinds are fixed by the essential properties of things - the properties that make it that kind of thing [Eagle] |
| 3977 | Laws are true generalisations which support counterfactuals and are confirmed by instances [Fodor] |