4 ideas
19695 | The devil was wise as an angel, and lost no knowledge when he rebelled [Whitcomb] |
13342 | Carnap defined consequence by contradiction, but this is unintuitive and changes with substitution [Tarski on Carnap] |
13251 | Each person is free to build their own logic, just by specifying a syntax [Carnap] |
18398 | Space, time, and some other basics, are not causal powers [Ellis] |