Singular Manual: compareModules

| #### D.4.15.26 compareModules Procedure from library `modules.lib` (see modules_lib). Usage: compareModules(M,N); or M==N; compares two Modules up to isomorphism Return: 1 or 0, if the are ismomophic or aren't Example:
    LIB "modules.lib";
    ring r;
    matrix ma[2][2]=x,y,x,y;
    Matrix m=ma;
    Module M=image(m);
    matrix na[2][1]=-y,x;
    Matrix n=na;
    M;
    ==> image | x y |
    ==>       | x y |
    ==>
    ==>
    Module N=image(n);
    N;
    ==> image | -y |
    ==>       | x  |
    ==>
    ==>
    N==M;
    ==> 0
    N=coker(n);
    N;
    ==> cokernel | -y |
    ==>          | x  |
    ==>
    ==>
    N==M;
    ==> 0

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