Singular Manual: PPolyN

| #### D.5.5.10 PPolyN Procedure from library `goettsche.lib` (see goettsche_lib). 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 Example:
    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

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