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Rigorous numerical enclosures for positi...
Tanaka, Kazuaki...

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Rigorous numerical enclosures for positive solutions of Lane-Emden's equation with sub-square exponents by Tanaka, Kazuaki ( Author )
Lemonjar Open Access
Australian National University
09-08-2023
The purpose of this paper is to obtain rigorous numerical enclosures for solutions of Lane-Emden's equation $-\Delta u=|u|^{p-1} u$ with homogeneous Dirichlet boundary conditions. We prove the existence of a nondegenerate solution $u$ nearby a numerically computed approximation $\hat{u}$ together with an explicit error bound, i.e., a bound for the difference between $ u $ and $\hat{u}$. In particular, we focus on the sub-square case in which $1<p<2$ so that the derivative $p|u|^{p-1}$ of the nonlinearity $|u|^{p-1} u$ is not Lipschitz continuous. In this case, it is problematic to apply the classical Newton-Kantorovich theorem for obtaining the existence proof, and moreover several difficulties arise in the procedures to obtain numerical integrations rigorously. We design a method for enclosing the required integrations explicitly, proving the existence of a desired solution based on a generalized Newton-Kantorovich theorem. A numerical example is presented where an explicit solution-enclosure is obtained for $ p=3/2 $ on the unit square domain $\Omega=(0,1)^2$.
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Article
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29.34 KB
English
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MYR 0.01
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http://arxiv.org/abs/1607.04619
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