modules.lib
LIB "modules.lib"; ring r; matrix m[1][3]=x,y2,z3; Matrix M=m; M; ==> {1} {2} {3} ==> {0} x y2 z3 ==> Ker(M); ==> image | y2 z3 0 | ==> | -x 0 z3 | ==> | 0 -x -y2 | ==> ==>