A Generalization of an Integrability Theorem of Darboux
A Generalization of an Integrability Theorem of Darboux
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达布可积定理的推广
DOI:
10.1007/s12220-018-00119-6
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发表时间:
2019
期刊:
影响因子:
--
通讯作者:
Kogan, Irina A.
中科院分区:
文献类型:
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作者:
Benfield, Michael;Jenssen, Helge Kristian;Kogan, Irina A.
In his monograph “Systèmes Orthogonaux” (Darboux, in Leçons sur les systèmes orthogonaux et les coordonnées curvilignes, Gauthier-Villars, Paris, 1910) Darboux stated three theorems providing local existence and uniqueness of solutions to first-order systems of the type $$\begin{aligned} \partial _{x_i} u_\alpha (x)=f^\alpha _i(x,u(x)), \quad i\in I_\alpha \subseteq \{1,\dots ,n\}. \end{aligned}$$∂xiuα(x)=fiα(x,u(x)),i∈Iα⊆{1,⋯,n}.For a given point $${\bar{x}}\in \mathbb {R}^n$$x¯∈Rn it is assumed that the values of the unknown $$u_\alpha $$uα are given locally near $${\bar{x}}$$x¯ along $$\{x\,|\, x_i={\bar{x}}_i \, \text {for each}\, i\in I_\alpha \}$${x|xi=x¯ifor eachi∈Iα}. The more general of the theorems, Théorème III, was proved by Darboux only for the cases $$n=2$$n=2 and 3. In this work we formulate and prove a generalization of Darboux’s Théorème III which applies to systems of the form $$\begin{aligned} {{\mathbf {r}}}_i(u_\alpha )\big |_x = f_i^\alpha (x, u(x)), \quad i\in I_\alpha \subseteq \{1,\dots ,n\} \end{aligned}$$ri(uα)|x=fiα(x,u(x)),i∈Iα⊆{1,⋯,n}where $${\mathcal {R}}=\{{{\mathbf {r}}}_i\}_{i=1}^n$$R={ri}i=1n is a fixed local frame of vector fields near $${\bar{x}}$$x¯. The data for $$u_\alpha $$uα are prescribed along a manifold $$\Xi _\alpha $$Ξα containing $${\bar{x}}$$x¯ and transverse to the vector fields $$\{{{\mathbf {r}}}_i\,|\, i\in I_\alpha \}$${ri|i∈Iα}. We identify a certain Stable Configuration Condition (SCC). This is a geometric condition that depends on both the frame $${\mathcal {R}}$$R and on the manifolds $$\Xi _\alpha $$Ξα; it is automatically met in the case considered by Darboux. Assuming the SCC and the relevant integrability conditions are satisfied, we establish local existence and uniqueness of a $$C^1$$C1-solution via Picard iteration for any number of independent variablesn.
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DOI:
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发表时间:
2016
期刊:
影响因子:
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作者:
Michael Benfield
通讯作者:
Michael Benfield
DOI:
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发表时间:
1987
期刊:
影响因子:
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作者:
Deane Yang
通讯作者:
Deane Yang
DOI:
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发表时间:
2009
期刊:
影响因子:
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作者:
H. Jenssen;I. Kogan
通讯作者:
I. Kogan
DOI:
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发表时间:
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期刊:
影响因子:
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作者:
G. Darboux
通讯作者:
G. Darboux