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Jul
1
awarded  Yearling
Jun
20
accepted When is a right-angled Coxeter group one-ended?
Jun
19
answered When is a right-angled Coxeter group one-ended?
Jun
19
comment When is a right-angled Coxeter group one-ended?
Six hundred pages on the geometry of Coxeter groups, what a huge work! Thank you for the reference, I didn't know it. I will add an answer applying these results to right-angled Coxeter groups. +1
Jun
19
asked When is a right-angled Coxeter group one-ended?
Jun
7
revised Monomorphisms into direct products
added 43 characters in body
Jun
7
asked Monomorphisms into direct products
Jun
4
revised Presentation of the additive group of the rational numbers
added 14 characters in body
Jun
4
answered Presentation of the additive group of the rational numbers
Jun
4
revised $\mathbb{R}$ is not a direct sum of its subgroups
added 1 character in body
Jun
2
answered Prove that $G = \langle x,y\ |\ x^2=y^2 \rangle $ is torsion free.
May
31
comment Around braid groups
Right, the description is rather ambiguous. What I had in mind is to consider braids where (up to isotopy) some fixed pairs of strands never cross in diagrams. But it is only an example, my question is general: it deals with groups which are defined by families of objects which are more or less braids.
May
31
comment Around braid groups
I am not sure. If we want the product to be well-defined, the subgroup we consider must be included into the pure braid subgroup, ie., in the kernel of the usual morphisme $B_n \to S_n$.
May
31
awarded  Necromancer
May
30
asked Around braid groups
May
30
comment Groups occuring as derived subgroups.
A more general result can be found here: math.stackexchange.com/questions/361582/…
May
27
comment Is $[X,Y] \neq 0$ the sufficient condition of $e^{X+Y} \neq e^Xe^Y$?
Related: math.stackexchange.com/questions/349180/…
May
25
answered An example of a group such that $G \cong G \times G$
May
23
comment Why is Rationals w.r.t addition not an Isomorphism to Rationals w.r.t. multiplication?
In fact, I don't see the link between what you said and I wrote... Can you be more precise in your question?
May
23
answered Why is Rationals w.r.t addition not an Isomorphism to Rationals w.r.t. multiplication?