Singular Manual: SegreA

| #### D.5.2.57 SegreA Procedure from library `chern.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: Example:
    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);

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