Talk:Normal maps - (non)-examples (Ex)
(Difference between revisions)
(Created page with "<wikitex>; 1) Suggestion: in any manifold, you can find an open ball $D^n$. $S^n$ is the one-point compactification of $D^n$. The rest of the manifold may be very complicated,...") |
|||
Line 4: | Line 4: | ||
2) Suggestion: If you can find one open ball, you can find a few. Use enough open balls until you have the right degree. | 2) Suggestion: If you can find one open ball, you can find a few. Use enough open balls until you have the right degree. | ||
− | 3) Suggestion: Looking at the CW-complex structure that looks like a $4n$-polygon, send the 2D cell in one complex to the other. The borders then need to match up. | + | 3) Suggestion: Looking at the CW-complex structure that looks like a $4n$-polygon, send the 2D cell in one complex to the other. The borders then need to match up (in a sense). |
</wikitex> | </wikitex> |
Revision as of 07:26, 9 January 2019
1) Suggestion: in any manifold, you can find an open ball . is the one-point compactification of . The rest of the manifold may be very complicated, but we can send all of it to the remaining point.
2) Suggestion: If you can find one open ball, you can find a few. Use enough open balls until you have the right degree.
3) Suggestion: Looking at the CW-complex structure that looks like a -polygon, send the 2D cell in one complex to the other. The borders then need to match up (in a sense).