6 ideas
23476 | Logical constants seem to be entities in propositions, but are actually pure form [Russell] |
23477 | We use logical notions, so they must be objects - but I don't know what they really are [Russell] |
10800 | The values of variables can't determine existence, because they are just expressions [Ryle, by Quine] |
18273 | Logical truths are known by their extreme generality [Russell] |
10855 | Actual infinities are not allowed in mathematics - only limits which may increase without bound [Gauss] |
22315 | There can't be a negative of a complex, which is negated by its non-existence [Potter on Russell] |