2 papers
math.GR2009
On solvable subgroups of automorphism groups of right-angled Artin groups
Matthew B. Day
For any right-angled Artin group, we show that its outer automorphism group contains either a finite-index nilpotent subgroup or a nonabelian free subgroup. This is a weak Tits alt…
math.GT2008
Extended flux maps on surfaces and the contracted Johnson homomorphism
Matthew B. Day
On a closed symplectic surface Sigma of genus two or more, we give a new construction of an extended flux map (a crossed homomorphism from the symplectomorphism group Symp(Sigma) t…