Timeline for Math for a cake
Current License: CC BY-SA 3.0
4 events
| when toggle format | what | by | license | comment | |
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| Dec 29, 2012 at 16:38 | history | edited | Qfwfq | CC BY-SA 3.0 |
added 14 characters in body
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| Dec 29, 2012 at 16:36 | comment | added | Qfwfq | Oops, I was sloppy: it should be $2$. And, for the formula to always give $2$, the polyhedron must be convex or at least homeomorphic to a sphere. For general polyhedra Euler's equation should read $v-e+f=\chi(P)$ where $P$ is, indeed, the polyhedron ...but this would just be a way to state that the Euler characteristic can be computed by the alternating sum of the number of k-cells of a (cellular) complex, so it would lose its "only combinatorics" appeal | |
| Dec 29, 2012 at 16:16 | comment | added | Matthias Ludewig | This should be two, not zero, shouldn't it? | |
| Dec 29, 2012 at 10:18 | history | answered | Qfwfq | CC BY-SA 3.0 |