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] |
468 | Musical performance can reveal a range of virtues [Damon of Ath.] |
2116 | The concept of an existing thing must contain more than the concept of a non-existing thing [Leibniz] |