Timeline for Bound on the index of an abelian subgroup in discrete subgroup of the euclidean group?

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Jul 21, 2014 at 12:54	history	edited	Dietrich Burde	CC BY-SA 3.0	deleted 2 characters in body
Jul 21, 2014 at 12:45	history	edited	Dietrich Burde	CC BY-SA 3.0	added 29 characters in body
Jul 21, 2014 at 12:43	comment	added	Dietrich Burde		@YCor: yes, thank you. I edited the answer, refering only to the crystallographic case.
Jul 21, 2014 at 12:38	history	edited	Dietrich Burde	CC BY-SA 3.0	added 51 characters in body
Jul 21, 2014 at 12:35	comment	added	YCor		a discrete group $\Gamma$ of isometries of $\mathbf{R}^n$ indees acts properly cocompactly by isometries on $\mathbf{R}^k$ for some $k\le n$ (namely any minimal nonempty invariant affine subspace of $\mathbf{R}^n$ for the given action, but you have to take into account that the new action has a finite kernel, possibly nontrivial, and precisely equal to the maximal finite normal subgroup in $\Gamma$.
Jul 21, 2014 at 12:29	history	edited	Dietrich Burde	CC BY-SA 3.0	added 25 characters in body
Jul 21, 2014 at 11:58	history	answered	Dietrich Burde	CC BY-SA 3.0