Zobrazeno 1 - 10
of 36
pro vyhledávání: '"MANGAHAS, JOHANNA"'
In this note, we consider the notion of what we call \emph{recognizing spaces} for stable subgroups of a given group. When a group $G$ is a mapping class group or right-angled Artin group, it is known that a subgroup is stable exactly when the larges
Externí odkaz:
http://arxiv.org/abs/2311.15187
Autor:
Clay, Matt, Mangahas, Johanna
This paper is a continuation of our previous work with Margalit where we studied group actions on projection complexes. In that paper, we demonstrated sufficient conditions so that the normal closure of a family of subgroups of vertex stabilizers is
Externí odkaz:
http://arxiv.org/abs/2005.14232
Publikováno v:
Compositio Math. 157 (2021) 1807-1852
We construct the first examples of normal subgroups of mapping class groups that are isomorphic to non-free right-angled Artin groups. Our construction also gives normal, non-free right-angled Artin subgroups of other groups, such as braid groups and
Externí odkaz:
http://arxiv.org/abs/2001.10587
We prove that finitely generated purely loxodromic subgroups of a right-angled Artin group $A(\Gamma)$ fulfill equivalent conditions that parallel characterizations of convex cocompactness in mapping class groups $\text{Mod}(S)$. In particular, such
Externí odkaz:
http://arxiv.org/abs/1412.3663
We provide an effective algorithm for determining whether an element of the outer automorphism group of a free group is fully irreducible. Our method produces a finite list which can be checked for periodic proper free factors.
Comment: 16 pages
Comment: 16 pages
Externí odkaz:
http://arxiv.org/abs/1402.7342
Autor:
Koberda, Thomas, Mangahas, Johanna
In this article, we propose two algorithms for determining the Nielsen-Thurston classification of a mapping class $\psi$ on a surface $S$. We start with a finite generating set $X$ for the mapping class group and a word $\psi$ in $\langle X \rangle$.
Externí odkaz:
http://arxiv.org/abs/1312.6141
Autor:
Mangahas, Johanna, Taylor, Samuel J.
We characterize convex cocompact subgroups of mapping class groups that arise as subgroups of specially embedded right-angled Artin groups. That is, if the right-angled Artin group G in Mod(S) satisfies certain conditions that imply G is quasi-isomet
Externí odkaz:
http://arxiv.org/abs/1306.5278
Autor:
Mangahas, Johanna
Given any generating set of any pseudo-Anosov-containing subgroup of the mapping class group of a surface, we construct a pseudo-Anosov with word length bounded by a constant depending only on the surface. More generally, in any subgroup G we find an
Externí odkaz:
http://arxiv.org/abs/1008.2217
We describe sufficient conditions which guarantee that a finite set of mapping classes generate a right-angled Artin group quasi-isometrically embedded in the mapping class group. Moreover, under these conditions, the orbit map to Teichmuller space
Externí odkaz:
http://arxiv.org/abs/1007.1129
Autor:
Mangahas, Johanna
Let Mod(S) denote the mapping class group of a compact, orientable surface S. We prove that finitely generated subgroups of Mod(S) which are not virtually abelian have uniform exponential growth with minimal growth rate bounded below by a constant de
Externí odkaz:
http://arxiv.org/abs/0805.0133