Timeline for Invertible 2-knots in $S^4$
Current License: CC BY-SA 4.0
9 events
| when toggle format | what | by | license | comment | |
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| Jun 22, 2021 at 23:01 | history | edited | Victor | CC BY-SA 4.0 |
added 182 characters in body
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| Jun 22, 2021 at 8:41 | vote | accept | Victor | ||
| Jun 22, 2021 at 0:25 | comment | added | Victor | Sorry, I meant a slightly different question. I changed it. Here is the old question: "Is it true that a knot $S^2\hookrightarrow S^4$ has an inverse iff it is trivial? Or it is also an open question?". | |
| Jun 22, 2021 at 0:17 | history | edited | Victor | CC BY-SA 4.0 |
added 38 characters in body
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| Jun 21, 2021 at 21:37 | history | edited | Victor | CC BY-SA 4.0 |
edited title
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| Jun 21, 2021 at 20:42 | vote | accept | Victor | ||
| Jun 22, 2021 at 0:10 | |||||
| Jun 21, 2021 at 20:23 | comment | added | Ryan Budney | A similar open question (as far as I know) is if the orientation-preserving diffeomorphism classes of compact smooth $4$-manifolds, that is a monoid with the connect-sum operation. Are there any invertible elements other than $S^4$? Are there irreducible 4-manifolds? Are there "small" homotopy 4-spheres, i.e. the Schoenflies problem? | |
| Jun 21, 2021 at 19:21 | answer | added | Danny Ruberman | timeline score: 7 | |
| Jun 21, 2021 at 17:53 | history | asked | Victor | CC BY-SA 4.0 |