Home Online Manual
Top
Back: NakYoshF
Forward: BettiNumsQp
FastBack:
FastForward:
Up: goettsche_lib
Top: Singular Manual
Contents: Table of Contents
Index: Index
About: About this document

D.15.5.5 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