Timeline for Are such functions differentiable?
Current License: CC BY-SA 4.0
10 events
| when toggle format | what | by | license | comment | |
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| Jan 16, 2021 at 17:17 | comment | added | Timothy Chow | I don't recognize this particular problem, but there are several books out there that are geared toward mathematical competitions (Olympiad, Putnam) whose title contains "functional equations." For example, look for authors Andreescu or Parvardi or Efthimiou. Such books often have a section on functional inequalities so maybe you'll find your problem (or something similar) in one of those books. | |
| Jan 13, 2021 at 19:14 | comment | added | Wolfgang | @ReinstateMonica thank you, nice example! | |
| Jan 13, 2021 at 7:53 | history | edited | M.H.Hooshmand |
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| Jan 12, 2021 at 20:39 | comment | added | Reinstate Monica | @Wolfgang Here is another example of a functional inequality that leads to a unique (up to choice of two constants) function: math.stackexchange.com/questions/777423/… | |
| Jan 12, 2021 at 20:19 | comment | added | Wolfgang | Regarding the two answers, I think it is more than noteworthy that this is a functional inequality instead of a functional equation, however it defines essentially (up to a constant factor) a unique function! I don't think there are many other functions that can be defined uniquely in such a way. | |
| Jan 10, 2021 at 12:07 | history | became hot network question | |||
| Jan 10, 2021 at 6:44 | vote | accept | M.H.Hooshmand | ||
| Jan 10, 2021 at 4:45 | answer | added | user130903 | timeline score: 43 | |
| Jan 10, 2021 at 4:31 | answer | added | Hhan | timeline score: 28 | |
| Jan 10, 2021 at 4:02 | history | asked | M.H.Hooshmand | CC BY-SA 4.0 |