ASKSAGE: Sage Q&A Forum - Latest question feedhttp://ask.sagemath.org/questions/Q&A Forum for SageenCopyright Sage, 2010. Some rights reserved under creative commons license.Thu, 07 Jun 2012 11:58:55 -0500Can I get the invariant subspaces of a matrix group action?http://ask.sagemath.org/question/8971/can-i-get-the-invariant-subspaces-of-a-matrix-group-action/Suppose I have a [EDIT: finitely-generated] matrix group $G \leq GL_n$, acting on $V = k^n$ in the usual way. Is there some way to calculate the $G$-invariant subspaces of $V$? Failing that, is there an easy way to ask if $V$ is irreducible as a $G$-module?Daniel McLauryThu, 07 Jun 2012 11:58:55 -0500http://ask.sagemath.org/question/8971/