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] |
21342 | A relation is internal if two things possessing the relation could not fail to be related [Moore,GE, by Heil] |
17722 | The concept 'red' is tied to what actually individuates red things [Peacocke] |