7 ideas
11074 | 'It is true that this follows' means simply: this follows [Wittgenstein] |
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] |
11073 | Two and one making three has the necessity of logical inference [Wittgenstein] |
1556 | By nature people are close to one another, but culture drives them apart [Hippias] |
13345 | Sentences are 'analytical' if every sequence of objects models them [Tarski] |