The tags matrix-analysismatrix-analysis (32 questions tagged) and matrix-theorymatrix-theory (18 questions) should probably be merged, unless there is a strong difference between them that I am not aware of (incidentally, there is also matricesmatrices, 150 questions tagged).
The tag matrix-inversematrix-inverse (6 questions) seems overly specific and in my opinion it should be removed outright.
