15 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] |
| 16062 | A necessary relation between fact-levels seems to be a further irreducible fact [Lynch/Glasgow] |
| 16061 | If some facts 'logically supervene' on some others, they just redescribe them, adding nothing [Lynch/Glasgow] |
| 16060 | Nonreductive materialism says upper 'levels' depend on lower, but don't 'reduce' [Lynch/Glasgow] |
| 16064 | The hallmark of physicalism is that each causal power has a base causal power under it [Lynch/Glasgow] |
| 10197 | An immanent universal is wholly present in more than one place [Zimmerman,DW] |
| 10198 | If only two indiscernible electrons exist, future differences must still be possible [Zimmerman,DW] |
| 10199 | Discernible differences at different times may just be in counterparts [Zimmerman,DW] |
| 14610 | Neither 'moving spotlight' nor 'growing block' views explain why we care what is present or past [Zimmerman,DW] |
| 14608 | A-theorists, unlike B-theorists, believe some sort of objective distinction between past, present and future [Zimmerman,DW] |