Timeline for A question about Gysin exact sequence for cohomology of the orbit space
Current License: CC BY-SA 4.0
4 events
| when toggle format | what | by | license | comment | |
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| Dec 15, 2023 at 16:20 | comment | added | Mehmet Onat | I did'nt understand your comment. As far as I can see, this hypothesis is not used in the proof. I thought this hypothesis was necessary for the Gysin exact sequence. I thought this was related to the orientability of the spherical fiber bundle. | |
| Dec 15, 2023 at 14:53 | comment | added | David Snyder | The statement of the Lemma says why that hypothesis is being imposed — the isotropy groups are all finite. | |
| Dec 14, 2023 at 8:38 | comment | added | Mehmet Onat | If the orbit map of a circle action is always orientable, then why does the action need to be almost free? | |
| Dec 13, 2023 at 8:55 | history | answered | David Snyder | CC BY-SA 4.0 |