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] |
16756 | Substantial forms must exist, to explain the stability of metals like silver and tin [Albertus Magnus] |
1556 | By nature people are close to one another, but culture drives them apart [Hippias] |