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arXiv 1004.5433cs.SC
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关于多项式泛函分解的若干结果

Some Results on the Functional Decomposition of Polynomials

Mark Giesbrecht

摘要:

如果g和h是域上的函数,我们可以考虑它们的复合f = g(h)。逆问题是分解:给定f,确定这样的函数g和h的存在性。在这篇论文中,我们考虑了一元和多元多项式的函数分解,以及特征为p的域F上的有理函数。在多项式的情况下,如果p整除g的次数,则在问题的数学和计算理论中都会出现“狂野”行为。我们认为野生的情况下,在一定程度上深入,并处理那些多项式的分解是在某种意义上的“野生”:添加剂多项式。我们确定的最大数量的分解,并显示了一些多项式时间算法的某些类的多项式与野生分解。对于有理函数的情况下,我们提出了一个定义的问题,一个规范化的版本的问题,一般的问题减少,和指数时间的正常问题的解决方案。

英文摘要:

If g and h are functions over some field, we can consider their composition f = g(h). The inverse problem is decomposition: given f, determine the ex- istence of such functions g and h. In this thesis we consider functional decom- positions of univariate and multivariate polynomials, and rational functions over a field F of characteristic p. In the polynomial case, "wild" behaviour occurs in both the mathematical and computational theory of the problem if p divides the degree of g. We consider the wild case in some depth, and deal with those polynomials whose decompositions are in some sense the "wildest": the additive polynomials. We determine the maximum number of decompositions and show some polynomial time algorithms for certain classes of polynomials with wild decompositions. For the rational function case we present a definition of the problem, a normalised version of the problem to which the general problem reduces, and an exponential time solution to the normal problem.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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