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D.5.2.57 SegreA
Procedure from librarychern.lib (see chern_lib).
- Usage:
- SegreA(I); I an ideal
- Return:
- list of integers
- Purpose:
- computes the Segre classes of the subscheme defined by I
- Note:
LIB "chern.lib"; // Consider a 3-dimensional projective space ring r = 0, (x, y, z, w), dp; // Consider 3 non-coplanar lines trough one point and compute the Segre class ideal I=xy, xz, yz; I; SegreA(I); // Now consider 3 coplanar lines trough one point and its Segre class ideal J=w, x*y*(x+y); J; SegreA(J); |