Laplace eigenvalues and eigenvectors bounds

eigs_conf_str

First eigenvalue and eigenvector bounds on a square (structured mesh)

eigs_conf_unstr

First eigenvalue and eigenvector bounds on a square (unstructured mesh)

eigs_hole_mesh

Adaptively refined mesh

eigs_hole_incl

Inclusion for the first eigenvalue, domain with a hole

Details: paper and preprint with Eric Cancès, Geneviève Dusson, Yvon Maday, and Benjamin Stamm, presentation

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