12 ideas
| 14187 | If logic is topic-neutral that means it delves into all subjects, rather than having a pure subject matter [Read] |
| 18812 | Split out the logical vocabulary, make an assignment to the rest. It's logical if premises and conclusion match [Tarski, by Rumfitt] |
| 14183 | Maybe arguments are only valid when suppressed premises are all stated - but why? [Read] |
| 14188 | Not all arguments are valid because of form; validity is just true premises and false conclusion being impossible [Read] |
| 14182 | If the logic of 'taller of' rests just on meaning, then logic may be the study of merely formal consequence [Read] |
| 13344 | X follows from sentences K iff every model of K also models X [Tarski] |
| 14184 | In modus ponens the 'if-then' premise contributes nothing if the conclusion follows anyway [Read] |
| 14186 | Logical connectives contain no information, but just record combination relations between facts [Read] |
| 13343 | A 'model' is a sequence of objects which satisfies a complete set of sentential functions [Tarski] |
| 14185 | Conditionals are just a shorthand for some proof, leaving out the details [Read] |
| 13345 | Sentences are 'analytical' if every sequence of objects models them [Tarski] |
| 16764 | The soul conserves the body, as we see by its dissolution when the soul leaves [Toletus] |