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] |
6040 | There is no universal goal to human life [Aenesidemus, by Photius] |
19399 | Prime matter is nothing when it is at rest [Leibniz] |