Okay, well...we're using maple for our math lab in our school and we tried to work on our project. We had this matrix: A := RTABLE(419945880,MATRIX([[a, a, a, a], [0, 0, 0, b], [0, c, 0, 0], [d, 0, 0, 0]]),Matrix) And when we tried to get the inverse, it would just lazily respond: Inverse(RTABLE(419945880,MATRIX([[a, a, a, a], [0, 0, 0, b], [0, c, 0, 0], [d, 0, 0, 0]]),Matrix)) And it's been working like that for other matrixes, I don't know if I need to configure maple in a different way or something...?