8 ideas
21563 | The 'no classes' theory says the propositions just refer to the members [Russell] |
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] |
21565 | Richard's puzzle uses the notion of 'definition' - but that cannot be defined [Russell] |
21564 | Vicious Circle: what involves ALL must not be one of those ALL [Russell] |
13345 | Sentences are 'analytical' if every sequence of objects models them [Tarski] |
7417 | God can't have silly perfections, but how do we decide which ones are 'silly'? [Joslin] |