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Questions about the branch of algebra that deals with groups.

11 votes
1 answer
385 views

A question on normal closures of elements in free groups.

Let $F$ be a free group of finite rank, and $p, b \in F$, where $b$ is a root element (i.e. not a proper power). I have a case where $p^{n_k} = V_{n_k}^{-1}b^{-1} V_{n_k} \cdot U_{n_k}^{-1}b U_{n_k}$ …
Alexey Kvashchuk's user avatar
7 votes
1 answer
354 views

Lyndon-Schützenberger for torsion-free hyperbolic groups

Given a torsion-free hyperbolic group $G$, does there exist a number $n(G)$ such that for any $x,y,z\in G$, $x^n y^n z^n =1$ implies that $x$, $y$, and $z$ commute pairwise? Some musings/questions... …
Alexey Kvashchuk's user avatar
5 votes
0 answers
729 views

Conjugacy classes of elements in free groups. One-variable equations.

First of all, wasn't sure what could be a good title for this question. If mods think of a better name, pls feel free to change it... Let $F$ be a (non-abelian) free group of finite rank, a vector $\ …
Alexey Kvashchuk's user avatar
3 votes

(Quadratic) equation in free group?

This is not easy. The complete modern description of the solution sets (Lyndon original result) was refined, for example, in the paper by Remeslennikov and Chiswell, and then a bit later by Myasnikov …
Alexey Kvashchuk's user avatar
3 votes

How to solve this one-variable equation in a free group?

Hi Mark, just wanted to share the solution to this problem as well as a method used. I found quite a powerful tool buried at the end of this paper "A Classification of Fully Residually Free Groups …
Alexey Kvashchuk's user avatar
2 votes
0 answers
601 views

Stable commutator length of elements in free groups.

http://arxiv.org/pdf/math/0611889v4.pdf (page 13) In the above paper by Danny Calegari he says that the result $\text{scl}(g) \geq 1/2$ (i.e. a stable commutator length $\text{scl}(g) := \displayst …
Alexey Kvashchuk's user avatar
2 votes
0 answers
136 views

Elements of minimal length in normal closures of elements in free groups

Let $F_n$ be a free group of rank $n$. Let $w\in F_n$ be cyclically reduced. What can be said about the element(s) of minimal length from the $\textit{ncl}(w)$ (normal closure of $w$ in $F_n$)? Unde …
Alexey Kvashchuk's user avatar