Timeline for Number of finite index subgroups in a free abelian group
Current License: CC BY-SA 4.0
3 events
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| Aug 4, 2022 at 13:04 | comment | added | Roland Bacher | Yes, Zou's paper does this. I find however this formula esthetically more pleasant. It encodes the obvious fact that these numbers form a (weakly) multiplicative function of the index for a fixed dimension. | |
| Aug 4, 2022 at 13:01 | comment | added | Sam Hopkins | It's pretty straightforward to get from the "explicit" formula in Carl-Fredrik's answer to this one. | |
| Aug 4, 2022 at 12:52 | history | answered | Roland Bacher | CC BY-SA 4.0 |