On the Cohomology of Congruence Subgroups of GL<sub>3</sub> over the Eisenstein Integers
On the Cohomology of Congruence Subgroups of GL<sub>3</sub> over the Eisenstein Integers
Let F be the imaginary quadratic field of discriminant −3 and OF its ring of integers. Let Γ be the arithmetic group GL3(OF), and for any ideal n⊂OF let Γ0(n) be the congruence subgroup of level n consisting of matrices with bottom row (0,0,*)modn. In this paper we compute the …