CASA Function: subresultantChain

Compute the subresultant chain of two multivariate polynomials.

Calling Sequence:

• sc := subresultantChain(P,Q,x)

Parameters:

P : polynon

• A first polynomial

Q : polynom

• A second polynomial

x : name

• the variable over which the subresultants should be computed

Result:

sc : list(polynom)

• A descending chain of all subresultants (including discrete ones) of the two polynomials P and Q.

Description:

• This procedure computes the chain of subresultants of two given multivariate polynomials over a given variable. The list it returns contains all subresultants, both regular and discrete ones.

Examples:

> subresultantChain(x^5-2*x^3-5*x^2+x^3-2*x-5,x^2+1,x);

> subresultantChain(x^5-2*x^3-5*x^2+x^3-2*x-5,x^4+1,x);

See Also: