5 ideas
13831 | Logic is based on transitions between sentences [Prawitz] |
10121 | Contradiction is not a sign of falsity, nor lack of contradiction a sign of truth [Pascal] |
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] |
22254 | Economic capitalist liberty naturally leads to democratic political liberty [Novak] |