Dimension Estimate of Almost Periodic Attractors by Simultaneous Diophantine Approximation

Dimension Estimate of Almost Periodic Attractors by Simultaneous Diophantine Approximation
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通过同时丢番图近似估计几乎周期性吸引子的维数

DOI:
10.1006/jdeq.1997.3318
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发表时间:
1997
影响因子:
2.4
通讯作者:
K. Naito
K. Naito
中科院分区:
数学2区
文献类型:
--
作者:
K. Naito

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摘要本文估计了半线性抛物型偏微分方程:Δ u /Δ t − d(t)Δu + g(t)u Δ f(t)的概周期轨线的分形维数,其中我们假设周期性:d(t + α 1)= d(t),g(t + α 2)= g(t),其中对有理数α 1,α 2线性无关,f(t +1)= f(t).利用同时丢番图逼近,我们证明了概周期吸引子的维数是1/ γ 1 + 2/ γ 2,其中γ 1是周期函数上的保持器条件的指数的最小值,γ 2是次最小值.
Abstract In this paper we estimate fractal dimensions of almost periodic trajectories for a semilinear parabolic partial differential equation: ∂ u /∂ t − d ( t ) Δu + g ( t )  u ∋ f ( t ), where we assume periodicity: d ( t + α 1 )= d ( t ), g ( t + α 2 )= g ( t ) for irrational numbers α 1 ,  α 2 , which are linearly independent over the rationals, and f ( t +1)equals; f ( t ). By using simultaneous Diophantine approximation, we can show that the dimension of the almost periodic attractor is majorized by 1/ γ 1 +2/ γ 2 , where γ 1 is the minimum number of the exponents of Holder's conditions on the periodic functions and γ 2 is the secondary minimum.
DOI: 10.1007/978-1-4684-0313-8
发表时间: 1993-09
期刊: --
影响因子: --
作者:
R. Temam
通讯作者: R. Temam