5 ideas
13831 | Logic is based on transitions between sentences [Prawitz] |
13825 | Natural deduction introduction rules may represent 'definitions' of logical connectives [Prawitz] |
13823 | In natural deduction, inferences are atomic steps involving just one logical constant [Prawitz] |
19440 | How do you know you have conceived a thing deeply enough to assess its possibility? [Vaidya] |
7076 | Mill wondered if he would be happy if all his aims were realised, and answered no [Mill, by Critchley] |