Minimal Almost Convexity

Abstract

In this article we show that the Baumslag-Solitar group $BS(1,2)$ is minimally almost convex, or $MAC$. We also show that $BS(1,2)$ does not satisfy Poénaru's almost convexity condition $P(2)$, and hence the condition $P(2)$ is strictly stronger than $MAC$. Finally, we show that the groups $BS(1,q)$ for $q\ge 7$ and Stallings' non-$F{P}_3$ group do not satisfy $MAC$. As a consequence, the condition $MAC$ is not a commensurability invariant.

Appeared in 2005. Putting all past papers on arvix

References in corpus (1)

• Thompson's Group F is not Minimally Almost Convex