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D.5.5.5 PPolyQp
Procedure from library goettsche.lib (see goettsche_lib).
- Usage:
- PPolyQp(z, r, n); z polynomial, r, n integers
- Return:
- polynomial in z
- Purpose:
- computes the Poincare polynomial of the punctual Quot-scheme
of rank r on n planar points
- Note:
- zero is returned if n<0 or r<=0
Example:
| LIB "goettsche.lib";
ring r=0, (z), ls;
// get the Poincare polynomial of the punctual Hilbert scheme (r=1)
// of 3 planar points
print( PPolyQp(z, 1, 3) );
==> 1+z2+z4
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