Explicit sharbly cycles at the virtual cohomological dimension for SL_n(Z)

Avner Ash, Paul E. Gunnells, Mark McConnell

Denote the virtual cohomological dimension of SL_n(Z) by t=n(n-1)/2. Let St denote the Steinberg module of SL_n(Q) tensored with Q. Let Sh_* denote the sharbly resolution of the St…