| #### D.3.2.17 hessenberg Procedure from library `linalg.lib` (see linalg_lib). Usage: hessenberg(M); matrix M Assume: M constant square matrix Return: matrix H; Hessenberg form of M Example:
    LIB "linalg.lib";
    ring R=0,x,dp;
    matrix M[3][3]=3,2,1,0,2,1,0,0,3;
    print(M);
    ==> 3,2,1,
    ==> 0,2,1,
    ==> 0,0,3
    print(hessenberg(M));
    ==> 3,2,1,
    ==> 0,2,1,
    ==> 0,0,3

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