Complete expansions of two binary polynomials yield improved optimal lower bounds for sums of Dirichlet eigenvalues of the Laplacian and poly-Laplacian.
Agmon, On kernels, eigenvalues and eigenfunctions of operators related to elliptic problems
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Improved lower bounds for Dirichlet eigenvalues of the Laplacian and poly-Laplacian on bounded Euclidean domains
Complete expansions of two binary polynomials yield improved optimal lower bounds for sums of Dirichlet eigenvalues of the Laplacian and poly-Laplacian.