Singular Manual: Ker

| #### D.4.17.25 Ker Procedure from library `modules.lib` (see modules_lib). Usage: Ker(M); M a Matrix Return: Module, image of a Matrix N with image(N)=Ker(M) Example:
    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 |
    ==>
    ==>

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