9 ideas
15102 | S4 says there must be some necessary truths (the actual ones, of which there is at least one) [Cameron] |
18812 | Split out the logical vocabulary, make an assignment to the rest. It's logical if premises and conclusion match [Tarski, by Rumfitt] |
13344 | X follows from sentences K iff every model of K also models X [Tarski] |
13343 | A 'model' is a sequence of objects which satisfies a complete set of sentential functions [Tarski] |
15103 | Blackburn fails to show that the necessary cannot be grounded in the contingent [Cameron] |
13345 | Sentences are 'analytical' if every sequence of objects models them [Tarski] |
1748 | Archelaus was the first person to say that the universe is boundless [Archelaus, by Diog. Laertius] |
15104 | The 'moving spotlight' theory makes one time privileged, while all times are on a par ontologically [Cameron] |
5989 | Archelaus said life began in a primeval slime [Archelaus, by Schofield] |