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arXiv 1805.02454math.AP
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具有衰减初值的无限图上p-Laplacian的渐近估计

Asymptotic estimates for the p-Laplacian on infinite graphs with decaying initial data

Daniele Andreucci, Anatoli F. Tedeev

摘要:

本文研究了无穷图中初始数据在无穷远处衰减的演化离散p-Laplacian的Cauchy问题。当初始数据具有有限质量时,我们证明了非负解的最优上界和梯度界,以及对质量约束的精确估计,有效传播速度。我们提供了一些时刻的解决方案,定义使用从一个给定的顶点的距离估计。我们的技术依赖于合适的Faber-Krahn型不等式,并着眼于连续非线性偏微分方程的局部理论。然而,众所周知,并非所有这种方法都可以在图中直接对应。这里的一个基本工具是一个结果连接的上确界的解决方案在一个给定的积极的时间与措施,其水平集在以前的时间。我们还考虑了缓慢衰减的初始数据的情况下,总质量是无限的。

英文摘要:

We consider the Cauchy problem for the evolutive discrete p-Laplacian in infinite graphs, with initial data decaying at infinity. We prove optimal sup and gradient bounds for nonnegative solutions, when the initial data has finite mass, and also sharp evaluation for the confinement of mass, i.e., the effective speed of propagation. We provide estimates for some moments of the solution, defined using the distance from a given vertex. Our technique relies on suitable inequalities of Faber-Krahn type, and looks at the local theory of continuous nonlinear partial differential equations. As it is known, however, not all of this approach can have a direct counterpart in graphs. A basic tool here is a result connecting the supremum of the solution at a given positive time with the measure of its level sets at previous times. We also consider the case of slowly decaying initial data, where the total mass is infinite.

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