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A class of semilinear elliptic equations on lattice graphs

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arxiv 2203.05146 v1 pith:57J6WPEN submitted 2022-03-10 math.AP

A class of semilinear elliptic equations on lattice graphs

classification math.AP
keywords coefficientsellipticeqnarrayequationgraphslatticesemilinearabove
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In this paper, we study the semilinear elliptic equation of the form \begin{eqnarray*} -\Delta u+a(x)|u|^{p-2}u-b(x)|u|^{q-2}u=0 \end{eqnarray*} on lattice graphs $\mathbb{Z}^{N}$, where $N\geq 2$ and $2\leq p<q<+\infty$. By the Br\'{e}zis-Lieb lemma and concentration compactness principle, we prove the existence of positive solutions to the above equation with constant coefficients $\bar{a},\bar{b}$ and the decomposition of bounded Palais-Smale sequences for the functional with variable coefficients, which tend to some constants $\bar{a},\bar{b}$ at infinity, respectively.

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  1. On positive solutions of Lane-Emden equations on the integer lattice graphs

    math.AP 2025-10 unverdicted novelty 5.0

    Existence of positive solutions to -Δu = Q |u|^{p-2}u on Z^d, half-space, and quadrant is established in Sobolev super-critical (α,p) regions and ruled out in Serrin sub-critical regions, with an open intermediate reg...