6 ideas
13831 | Logic is based on transitions between sentences [Prawitz] |
13825 | Natural deduction introduction rules may represent 'definitions' of logical connectives [Prawitz] |
18946 | Unreflectively, we all assume there are nonexistents, and we can refer to them [Reimer] |
13823 | In natural deduction, inferences are atomic steps involving just one logical constant [Prawitz] |
14288 | 'If A,B' affirms that A⊃B, and also that this wouldn't change if A were certain [Jackson, by Edgington] |
13769 | Conditionals are truth-functional, but should only be asserted when they are confident [Jackson, by Edgington] |