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D.15.2.26 modalityNNB
Procedure from library arnold.lib (see arnold_lib).
- Usage:
- modalityNNB(f,w); f poly or Poly or NormalForm
- Return:
- the modality of f (or f.value or f.phi.sourcegerm.value), if f (or f.value or f.phi.sourcegerm.value) is equivalent to a germ with a nondegenerate Newton boundary,
or an ERROR message otherwise
Example:
| | LIB "arnold.lib";
ring R=0,(x,y),ds;
poly f = x^9+x^2*y^4+y^2*x^4+y^8+x^3*y^5+y^2*x^5;
poly phix = x+y^2+x^2+x*y+x^2*y+x*y^3;
poly phiy = y+y^2+2*x^2+x*y+y*x^2+y^2*x+x*y^4;
map phi = R,phix,phiy;
f = phi(f); // f is equivalent to a germ with a nondegenerate Newton boundary
Poly F = makePoly(f);
NormalForm N;
N = determineNormalForm(F);
modalityNNB(f);
==> 6
modalityNNB(F);
==> 6
modalityNNB(N);
==> 6
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