Year: 2026
Type: preprint
Abstract: Let $Ω\subset\mathbb R^2$ be a bounded connected Lipschitz domain, and let $\{μ_j(Ω)\}_{j\geq1}$ and $\{λ_j(Ω)\}_{j\geq1}$ denote the Neumann and Dirichlet Laplacian eigenvalues, respectively, counted with multiplicity. We prove that $$ μ_3(Ω)<λ_1(Ω), $$ thereby removing the simple-connectivity assumption from the previously known planar result at the first Dirichlet threshold. We also establish a three-spectrum counting inequality relating the Dirichlet, Neumann, and conductivity spectra.
Source: arXiv (Cornell University)
Authors: Tang, Quanyu, Zhang, Haiqi
Language: English
Subfield: Mathematical Physics
Field: Mathematics
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7212055453