Timeline for On similar concepts in mathematics whose similarity is a non-trivial fact.
Current License: CC BY-SA 3.0
5 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Dec 19, 2012 at 19:12 | history | edited | Peter Michor | CC BY-SA 3.0 |
added 140 characters in body
|
| Dec 19, 2012 at 13:59 | comment | added | user22882 | What are the conditions on $p$ and $q$ in (4)? | |
| Dec 19, 2012 at 12:39 | comment | added | Philip van Reeuwijk | Paul: The linked article seems to be about the \emph{possibility} of a smooth choice of a root of what is here called $f^2$. In your example, $|x|$ is a bad choice, $x$ is a good one. | |
| Dec 19, 2012 at 11:48 | comment | added | Paul Siegel | Set $f(x) = |x|$. $f$ is not even once differentiable at $0$, but $f^2(x) = x^2$ is $C^\infty$. Am I missing something? | |
| Dec 19, 2012 at 10:36 | history | answered | Peter Michor | CC BY-SA 3.0 |