Jan 3, 2017
Karen Vogtmann
#outer space#group theory#Teichmüller theory#free group#algebra#mathematics#maths#math#geometry#inverse#inversion#flip#arithmetic#hyperbolic#half-plane#hyperbolic space#negative curvature#curved spaces#female mathematicians#Karen Vogtmann#symmetry#symmetries#automorphisms#outer automorphism#modular#half-space#PSL#integers#projective space#linear algebra