On the cohomology of GL_2 and SL_2 over imaginary quadratic fields

Herbert Gangl, Paul E. Gunnells, Jonathan Hanke +1

We report on computations of the cohomology of GL_2(O_D) and SL_2(O_D), where D<0 is a fundamental discriminant. These computations go well beyond earlier results of Vogtmann and S…