Decomposition of polynomials and approximate roots

Details Decomposition of polynomials and approximate roots Decomposition of polynomials and approximate roots

2009-10-09

arxiv.org/abs/0910.1676v1

Mathematics

Algebraic Geometry

Scientific paper

We state a kind of Euclidian division theorem: given a polynomial P(x) and a divisor d of the degree of P, there exist polynomials h(x),Q(x),R(x) such that P(x) = h(Q(x)) +R(x), with deg h=d. Under some conditions h,Q,R are unique, and Q is the approximate d-root of P. Moreover we give an algorithm to compute such a decomposition. We apply these results to decide whether a polynomial in one or several variables is decomposable or not.

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