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BUILT-IN MATHEMATICA SYMBOL
Subresultants[poly1, poly2, var]
generates a list of the principal subresultant coefficients of the polynomials 
and 
with respect to the variable var.
Subresultants[poly1, poly2, var, Modulus->p]
computes the principal subresultant coefficients modulo the prime p.
Examplesopen all
Basic Examples (2)
The first three principal subresultant coefficients (PSCs) are zero when there are three common roots, multiplicities counted:
| In[1]:= |
| Out[1]= |  |
PSCs of two cubic polynomials:
| In[1]:= |
| Out[1]= |  |
When the polynomials have a pair of equal roots, the first PSC disappears:
| In[2]:= |
| Out[2]= |  |
When two pairs of roots are equal, the first two PSCs disappear:
| In[3]:= |
| Out[3]= |  |
New in 4 | Last modified in 9
