Function: polclass
Section: polynomials
C-Name: polclass
Prototype: GDn
Help: polclass(D, {x = 'x}): return the Hilbert class polynomial for the disciminant D.
Doc:
 Return the Hilbert class polynomial for the $j$ function for the imaginary quadratic
 discriminant $D$ in the variable $x$.
 \bprog
 ? polclass(-163)
 %1 = x + 262537412640768000
 ? polclass(-51, 'z)
 %2 = z^2 + 5541101568*z + 6262062317568
 @eprog
