display all the ideas for this combination of philosophers
4 ideas
19237 | Deduction is true when the premises facts necessarily make the conclusion fact true [Peirce] |
5395 | Demonstration always relies on the rule that anything implied by a truth is true [Russell] |
14106 | Implication cannot be defined [Russell] |
14108 | It would be circular to use 'if' and 'then' to define material implication [Russell] |