Singular Manual: signatureNemethi

| #### D.6.18.3 signatureNemethi Procedure from library `surfacesignature.lib` (see surfacesignature_lib). Usage: signatureNemethi(N,f); N = integer, f = reduced poly in 2 variables, # empty or 1,2,3 - if #[1] = 1 then resolution of singularity is used - if #[1] = 2 then spectral pairs are used - if # is empty then both upper variants are used in parallel and the fastest returns the result Return: signature of surface singularity defined by z^N + f(x,y) = 0 Remark: computes the signature of some special surface singularities Example:
    LIB "surfacesignature.lib";
    ring r = 0,(x,y),dp;
    int N  = 3;
    poly f = x15-21x14+8x13y-6x13-16x12y+20x11y2-x12+8x11y-36x10y2
    +24x9y3+4x9y2-16x8y3+26x7y4-6x6y4+8x5y5+4x3y6-y8;
    signatureNemethi(N,f,1);
    ==> -92
    printlevel = 1;
    signatureNemethi(N,f);
    ==> Resolution of singularity has been used.
    ==> -92

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