4 ideas
6408 | Russell needed three extra axioms to reduce maths to logic: infinity, choice and reducibility [Grayling] |
13083 | The essence is the necessary properties, and the concept includes what is contingent [Leibniz] |
6414 | Two propositions might seem self-evident, but contradict one another [Grayling] |
468 | Musical performance can reveal a range of virtues [Damon of Ath.] |