This is a followup to this question about the (left) noetherianity of the group ring of $GL_n(\mathbf{Z})$: https://mathoverflow.net/questions/165039/does-gl-nz-have-a-noetherian-group-ring Given that $\mathbf{Z}[GL_n(\mathbf{Z})]$ is not left noetherian, I want to ask if there is a relaxation. What I gather from this fact is that this ring is too large and contains information about *all* representations of $GL_n(\mathbf{Z})$, while maybe the right thing is to restrict to some class of "reasonable" representations to get more control. As an analogy, the theory of polynomial representations of $GL_n(K)$ for an algebraically closed field $K$ is "reasonable" and is equivalent to the study of modules over the Schur algebra. I would like to know if there are similar nice classes of representations for $GL_n(\mathbf{Z})$. One candidate is to look at polynomial representations, but I do not necessarily want to assume that the representations are compatible with base change of the ring $\mathbf{Z}$ to $\mathbf{Q}$, for example, so I am looking for something else. Ideally the class of representations would be equivalent to modules over some nice algebra, where nice might mean left noetherian.