7 ideas
15547 | Negative existentials have 'totality facts' as truthmakers [Armstrong, by Lewis] |
11211 | If a sound conclusion comes from two errors that cancel out, the path of the argument must matter [Rumfitt] |
11210 | Standardly 'and' and 'but' are held to have the same sense by having the same truth table [Rumfitt] |
11212 | The sense of a connective comes from primitively obvious rules of inference [Rumfitt] |
18465 | An 'equivalence' relation is one which is reflexive, symmetric and transitive [Kunen] |
15542 | All possibilities are recombinations of properties in the actual world [Armstrong, by Lewis] |
11214 | We learn 'not' along with affirmation, by learning to either affirm or deny a sentence [Rumfitt] |