4 ideas
17831 | Cantor gives informal versions of ZF axioms as ways of getting from one set to another [Cantor, by Lake] |
22363 | You have only begun to do real science when you can express it in numbers [Kelvin] |
19216 | Propositions (such as 'that dog is barking') only exist if their items exist [Williamson] |
20644 | Energy has progressed from a mere formula, to a principle pervading all nature [Kelvin] |