display all the ideas for this combination of philosophers
3 ideas
14780 | Only study logic if you think your own reasoning is deficient [Peirce] |
Full Idea: It is foolish to study logic unless one is persuaded that one's own reasonings are more or less bad. | |
From: Charles Sanders Peirce (Criterion of Validity in Reasoning [1903], II) |
12376 | Demonstrations by reductio assume excluded middle [Aristotle] |
Full Idea: Demonstrations by reduction to the impossible assume that everything is asserted or denied. | |
From: Aristotle (Posterior Analytics [c.327 BCE], 77a23) | |
A reaction: This sounds like the lynchpin of classical logic. |
11033 | Predications of predicates are predications of their subjects [Aristotle] |
Full Idea: Whenever one thing is predicated of another as of a subject, all things said of what is predicated will be said of the subject also. | |
From: Aristotle (Categories [c.331 BCE], 01b10) |