9 ideas
| 13831 | Logic is based on transitions between sentences [Prawitz] |
| 11211 | If a sound conclusion comes from two errors that cancel out, the path of the argument must matter [Rumfitt] |
| 11210 | Standardly 'and' and 'but' are held to have the same sense by having the same truth table [Rumfitt] |
| 13825 | Natural deduction introduction rules may represent 'definitions' of logical connectives [Prawitz] |
| 11212 | The sense of a connective comes from primitively obvious rules of inference [Rumfitt] |
| 13823 | In natural deduction, inferences are atomic steps involving just one logical constant [Prawitz] |
| 11214 | We learn 'not' along with affirmation, by learning to either affirm or deny a sentence [Rumfitt] |
| 7293 | It is legitimate to do harm if it is the unintended side-effect of an effort to achieve a good [Grayling] |
| 7292 | War must also have a good chance of success, and be waged with moderation [Grayling] |