Definition
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[0C8]Given a commutative ring \(A\), the set of polynomials \(p(x)=a_ 0+a_ 1x+\cdots + a_ n x^ n\) with coefficients \(a_ iβ A\) is usually denoted by \(A[x]\); this set, endowed with the usual operations of sum and product of polynomials, is a commutative ring.