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] |
467 | A virtue is a combination of intelligence, strength and luck [Ion] |
20716 | False prophets will perform wonders to deceive even the elect [Mark] |