| #### D.3.2.13 gauss_nf Procedure from library `linalg.lib` (see linalg_lib). Usage: gauss_nf(A); A any constant matrix Return: matrix; gauss normal form of A (uses gaussred) Example:
    LIB "linalg.lib";
    ring r = 0,(x),dp;
    matrix A[4][4] = 1,4,4,7,2,5,5,4,4,1,1,3,0,2,2,7;
    print(gauss_nf(A));
    ==> 1,4, 4, 7,
    ==> 0,-3,-3,-10,
    ==> 0,0, 0, 25,
    ==> 0,0, 0, 0

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