5 ideas
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] |
12712 | Substance is that which can act [Leibniz] |
12737 | Nature can be fully explained by final causes alone, or by efficient causes alone [Leibniz] |
468 | Musical performance can reveal a range of virtues [Damon of Ath.] |