The integral homology of $PSL_2$ of imaginary quadratic integers of class number two
Résumé
We calculate the integral homology of the non-Euclidean Bianchi groups $PSL_2$ of the ring of integers of the number field $Q[\sqrt{-m}]$ for $m=5,6,10,13$, making essential use of an equivariant cellular decomposition of a retract of hyperbolic three-space due to Floege.
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