Computations directly on the cuspidal cohomology of congruence subgroups of $\mathrm{SL}(3,\mathbb{Z})$

Zachary Porat

Ash, Grayson, and Green [J. Number Theory 19 (1984), pp. 412-436] compute the action of Hecke operators on a certain subspace of the cohomology of low-level congruence subgroups of…