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] |
7566 | The Identity of Indiscernibles is really the same as the verification principle [Jolley] |
1558 | Clearly the gods ignore human affairs, or they would have given us justice [Thrasymachus] |