 Dirichlet Laplacian eigenvalue (source code)

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= Dirichlet Laplacian eigenvalue
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{title2=$\lambda_j$}

A Dirichlet Laplacian eigenvalue is a number $\lambda$ for which $-\Delta u=\lambda u$ has a nonzero solution with zero boundary trace. At such a value, the shifted operator $\Delta+\lambda$ is not invertible.

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