Timeline for What notions are used but not clearly defined in modern mathematics?
Current License: CC BY-SA 2.5
4 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jun 2, 2011 at 2:06 | comment | added | David Corwin | What about nonstandard analysis? | |
| Feb 28, 2011 at 12:30 | comment | added | David Harris | Yemon, I agree with you completely. I said they are "almost" in this category. They are not usually used, and if so they are often defined rigorously. But there is still a category of intuitive, non-rigorous uses of the infinitesimal concept. | |
| Feb 28, 2011 at 6:35 | comment | added | Yemon Choi | For these to qualify, don't infinitesimals need to be "used but not clearly defined in modern mathematics"? I am not sure they satisfy both these conditions, unless by "used" you mean "as a pedagogical aid". (That's not to downplay Loeb measures etc etc but where they are used they are most assuredly "clearly defined".) | |
| Feb 27, 2011 at 18:07 | history | answered | David Harris | CC BY-SA 2.5 |