Timeline for Proper actions on unitary spheres of a Hilbert space
Current License: CC BY-SA 3.0
4 events
| when toggle format | what | by | license | comment | |
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| May 13, 2013 at 10:23 | comment | added | Nicolas Boerger | I am Thinking mainly about Isometric actions. Thanks for the comments. | |
| May 13, 2013 at 9:22 | comment | added | Daniele Zuddas | If you mean only topological actions, then this is the same of actions on Hilbert spaces, because the infinite-dimensional unitary sphere is diffeomorphic with the Hilbert space, see C. Bessaga, "Every infinite-dimensional Hilbert space is diffeomorphic with its unit sphere", Bull. Acad. Polon. Sci. Sér. Sci. Math. Astronom. Phys. 14 1966 27-31. | |
| May 13, 2013 at 8:55 | comment | added | Mariano Suárez-Álvarez | Every torsion free discrete group $G$ acts properly and discontinuousy on the unit sphere of $L^2(G)$, no? | |
| May 13, 2013 at 8:38 | history | asked | Nicolas Boerger | CC BY-SA 3.0 |