| #### D.3.2.4 sym_gauss Procedure from library `linalg.lib` (see linalg_lib). Usage: sym_gauss(A); A = symmetric matrix Return: matrix, diagonalisation of A with symmetric gauss algorithm Example:
    LIB "linalg.lib";
    ring r=0,(x),lp;
    matrix A[2][2]=1,4,4,15;
    print(A);
    ==> 1,4,
    ==> 4,15
    print(sym_gauss(A));
    ==> 1,0,
    ==> 0,-1

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