|Subresultants[poly1, poly2, var]|
generates a list of the principal subresultant coefficients of the polynomials poly1 and poly2 with respect to the variable var.
Basic Examples (2)
The first three PSC's are zero when there are three common roots, multiplicities counted:
Principal subresultant coefficients (PSC's) of two cubic polynomials:
When the polynomials have a pair of equal roots, the first PSC disappears:
When two pairs of roots are equal, the first two PSC's disappear:
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