Timeline for $\pi_4$ of simply-connected 4-manifold
Current License: CC BY-SA 2.5
2 events
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| Sep 1, 2010 at 20:53 | comment | added | Nikita Kalinin | Thanks. It is clear up situation. It seems that relations from 4-cell borns from $\pi_4(S^3)$ and attaching map of 4-cell, but explanation is still vague (cut out one point from 4-cell and crush homotopy between elements of $\pi_4(M^4)$ to 2-skeleton. But we need, for example, that preimages of cutted point are points too... that now is not true) | |
| Sep 1, 2010 at 2:28 | history | answered | Ian Agol | CC BY-SA 2.5 |