display all the ideas for this combination of texts
4 ideas
2430 | I can learn the concepts of duration and number just from observing my own thoughts [Descartes] |
2252 | Surely maths is true even if I am dreaming? [Descartes] |
8763 | The number 3 is presumably identical as a natural, an integer, a rational, a real, and complex [Shapiro] |
18249 | Cauchy gave a formal definition of a converging sequence. [Shapiro] |