Coefficient extraction
= Coefficient extraction
{title2=$[x_1^{a_1}\cdots x_n^{a_n}]P$}
Coefficient extraction is the linear operation selecting the coefficient of a specified <monomial> from a <polynomial> or <Laurent polynomial>. Multiplying by the inverse of that monomial reduces the operation to taking a <constant term>. The coefficient form of the <Combinatorial Nullstellensatz> expresses certain coefficient extractions as weighted sums of evaluations on a finite product set.