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] |
21547 | On Meinong's principles 'the existent round square' has to exist [Russell] |
5655 | Happiness is not satisfaction of desires, but fulfilment of values [Bradley, by Scruton] |