Note: This functor is optional!
Computes the principal subresultant of two polynomials p and q of type PolynomialTraits_d::Coefficient_type with respect to the outermost variable. The ith principal subresultant, sres_{i}(p,q), is defined as the coefficient at t^{i} of the ith polynomial subresultant Sres_{i}(p,q). Thus, it is either the leading coefficient of Sres_{i}, or zero in the case where its degree is below i.
The result is written in an output range, starting with the 0th principal subresultant sres_{0}(p,q) ,aka as the resultant of p and q. (Note that sres_{0}(p,q)=Sres_{0}(p,q) by definition)
 

 
computes the principal subresultants of p and q, with respect to the outermost variable. Each element is of type PolynomialTraits_d::Coefficient_type.  
 

 
computes the principal subresultants of p and q, with respect to the variable x_{i}. 
Polynomial_d
PolynomialTraits_d
PolynomialTraits_d::Resultant
PolynomialTraits_d::PolynomialSubresultants
PolynomialTraits_d::PrincipalSturmHabichtSequence