4 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] |
12708 | The soul is not a substance but a substantial form, the first active faculty [Leibniz] |
1556 | By nature people are close to one another, but culture drives them apart [Hippias] |