On the regularity of the roots of hyperbolic polynomials
On the regularity of the roots of hyperbolic polynomials
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关于双曲多项式根的正则性
DOI:
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发表时间:
2012
期刊:
影响因子:
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通讯作者:
L. Pernazza
中科院分区:
文献类型:
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作者:
F. Colombini;N. Orrú;L. Pernazza
We prove that a hyperbolic monic polynomial whose coefficients are functions of class Cr of a parameter t admits roots of class C1 in t, if r is the maximal multiplicity of the roots as t varies. Moreover, if the coefficients are functions of t of class C2r, then the roots may be chosen two times differentiable at every point in t. This improves, among others, previous results of Bronšteĭn, Mandai, Wakabayashi and Kriegl, Losik and Michor.