D.5.5.10 PPolyN

Usage:

PPolyN(t, q, m, n); t polynomial, q, m, n integers

Return:

polynomial in t

Purpose:

computes the Poincare polynomial of the moduli space of Kronecker modules N(q; m, n)

Note:

if m and n are not coprime, the result does not necessary make sense

LIB "goettsche.lib";
ring r=0, (t), ls;
// get the Poincare polynomial of N(3; 2, 3)
print( PPolyN(t, 3, 2, 3) );
==> 1+t2+3t4+3t6+3t8+t10+t12