共查询到20条相似文献,搜索用时 9 毫秒
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《Comptes Rendus de l'Academie des Sciences Series IIA Earth and Planetary Science》1998,326(7):833-838
We study in this Note ordinary differential equations for divergence-free vector-fields with a limited regularity. We first observe that it is equivalent to solve the associated transport equations (i.e. Liouville equations). Then, we show existence, uniqueness, and stability results for generic vector-fields in L1 or for “piecewise” W1.1 vector-fields. 相似文献
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Jean-Paul Bézivin 《Aequationes Mathematicae》1992,43(2-3):159-176
Summary In this paper, we study the convergence of formal power series solutions of functional equations of the formP
k(x)([k](x))=(x), where
[k]
(x) denotes thek-th iterate of the function.We obtain results similar to the results of Malgrange and Ramis for formal solutions of differential equations: if(0) = 0, and(0) =q is a nonzero complex number with absolute value less than one then, if(x)=a(n)x
n is a divergent solution, there exists a positive real numbers such that the power seriesa(n)q
sn(n+1)2
x
n has a finite and nonzero radius of convergence. 相似文献
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Sans résuméAus den Comptes rendus des séances de l'Académie des Sciences, t. 119, Sitzung vom 8. Oktober 1894. 相似文献
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M. Camille Jordan 《Mathematische Annalen》1869,1(4):583-591
Sans résuméExtrait d'un traité des équations algébriques en cours de publication. 相似文献
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Jean-Paul Bézivin 《Aequationes Mathematicae》1990,39(1):68-77
Summary We study solutions of functional equationsP(f
[10]
,,f
[s]
) = 0, whereP is a non zero polynomial ins + 1 variables andf
[k]
denotes thekth iterate of a functionf.
We deal with three distinct cases: first,f is an entire function of a complex variable, we show then thatf is a polynomial. Second, we also prove thatf is a polynomial if it is an entire function of ap-adic variable. Third, we considerf a formal power series with coefficients in a number fieldK; subject to some apparently natural restrictions onf and onP, we find thatf is an algebraic power series over the ring of polynomials inK[x].
Sur les équations fonctionnelles aux itérées相似文献
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《Comptes Rendus de l'Academie des Sciences Series IIA Earth and Planetary Science》1997,324(2):183-186
We study the limit of the periodic, incompressible, rotating fluid equations, as the Coriolis force goes to infinity: in the case of well-prepared initial data in L2, the weak solutions converge to the solution of a two-dimensional, incompressible Navier-Stokes equation. We also prove that the rotating fluid equations are globally well-posed under an appropriate assumption on the oscillating part of the initial data. 相似文献
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M. Ghermanesco 《Annali di Matematica Pura ed Applicata》1934,12(1):305-326
Sans résumé
Le résumé de ce Mémoire a l'annoncé dans ? C. R. ?, Paris (1933), t. 197, p. 805. 相似文献
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Mr. Emile Picard 《Mathematische Annalen》1896,47(1):155-156
Sans résuméExtraid d'une lettre adressée à Mr. Klein 相似文献