| #### D.6.16.1 signatureBrieskorn Procedure from library `surfacesignature.lib` (see surfacesignature_lib). Usage: signatureBrieskorn(a1,a2,a3); a1,a2,a3 = integers Return: signature of Brieskorn singularity x^a1+y^a2+z^a3 Example:
    LIB "surfacesignature.lib";
    ring R = 0,x,dp;
    signatureBrieskorn(11,3,5);
    ==> -48

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