29 citations · 167 across the 26 of their papers we have counts for
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math.GR2005
Homotopy formulas for cyclic groups acting on rings
Christian Kassel
The positive cohomology groups of a finite group acting on a ring vanish when the ring has a norm-one element. In this note we give explicit homotopies on the level of cochains whe…
math.GR2005★ 27 cited
Sturmian morphisms, the braid group B_4, Christoffel words and bases of F_2
Christian Kassel, Christophe Reutenauer
We give a presentation by generators and relations of a certain monoid generating a subgroup of index two in the group Aut(F_2) of automorphisms of the rank two free group F_2 and…