Local Polynomial Factorisation: Improving the Montes Algorithm
Local Polynomial Factorisation: Improving the Montes Algorithm
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局部多项式因式分解:改进 Montes 算法
DOI:
10.1145/3476446.3535487
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发表时间:
2022
期刊:
影响因子:
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通讯作者:
Martin Weimann
中科院分区:
文献类型:
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作者:
A. Poteaux;Martin Weimann
We improve significantly the Nart-Montes algorithm for factoring polynomials over a complete discrete valuation ring A. Our first contribution is to extend the Hensel lemma in the context of generalised Newton polygons, from which we derive a new divide and conquer strategy. Also, if A has residual characteristic zero or high enough, we prove that approximate roots are convenient representatives of types, leading finally to an almost optimal complexity both for irreducibility and factorisation issues, plus the cost of factorisations above the residue field. For instance, to compute an OM-factorisation of F∈A[x], we improve the complexity results of [3] by a factor δ, the discriminant valuation of F.