4 ideas
18946 | Unreflectively, we all assume there are nonexistents, and we can refer to them [Reimer] |
18256 | Quantity is inconceivable without the idea of addition [Frege] |
10855 | Actual infinities are not allowed in mathematics - only limits which may increase without bound [Gauss] |
9831 | Geometry appeals to intuition as the source of its axioms [Frege] |