Timeline for How can I compute the full set of nodes of a surface?
Current License: CC BY-SA 2.5
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| Nov 16, 2010 at 9:16 | comment | added | quim | These are, as Sándor points out, each (analytically) isomorphic to the vertex of a quadratic cone. See the picture here: enriques.mathematik.uni-mainz.de/docs/Ecayley.shtml I would not call them selfintersections; a selfintersecting surface would be more like Whitney's umbrella en.wikipedia.org/wiki/Whitney_umbrella where the singularity is not isolated (the surface is not normal) i.e., there are infinitely many singular points. | |
| Nov 16, 2010 at 6:08 | comment | added | node-question | I'm referring to nodes such as the four on Cayley's cubic surface. I believe these are self-intersections of the surface, no? | |
| Nov 16, 2010 at 5:36 | history | answered | Sándor Kovács | CC BY-SA 2.5 |