Timeline for Dehn-Nielsen-Baer Theorem for surfaces with boundary and punctures
Current License: CC BY-SA 4.0
5 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| May 25, 2020 at 9:27 | comment | added | Mark Grant | @qkqh: I was assuming in the question that automorphisms fix the whole of $\partial S$ pointwise. | |
| May 21, 2020 at 18:08 | comment | added | qkqh | @MarkGrant For (2), the surjectivity, at least, we should add a condition that the automorphisms fix the component of $\partial S$ containing the basepoint. | |
| Aug 22, 2019 at 10:04 | vote | accept | Mark Grant | ||
| Aug 16, 2018 at 9:34 | comment | added | Mark Grant | Hi Allen, thanks for your answer, it is very revealing. May I ask some follow up questions? (1) Is the kernel generated by these Dehn twists? and (2) do we have surjectivity onto ${\rm Aut}^*\pi_1(S-Q,d)$ (automorphisms fixing the individual conj. classes of boundary curves and permuting conj. classes of curves around the punctures)? | |
| Aug 15, 2018 at 18:34 | history | answered | Allen Hatcher | CC BY-SA 4.0 |