public Expr ToExpr()
{
var(VN, VSN, VRN) = _variables.OfType <VarPowN, VarN, VarRootN>();
var numerators = VN.Concat <Variable>(VSN).Concat(VRN).Select(f => f.ToExpr());
var(VD, VSD, VRD) = _variables.OfType <VarPowD, VarD, VarRootD>();
var denominators = VD.Concat <Variable>(VSD).Concat(VRD).Select(f => f.ToExpr());
var numerator = numerators.IsEmpty() ? new One() : numerators.Aggregate((n1, n2) => MultiplyOp.Create(n1, n2));
if (denominators.IsEmpty())
{
return(numerator);
}
return(DivideOp.Create(numerator, denominators.Aggregate((n1, n2) => MultiplyOp.Create(n1, n2))));
}