I am searching for the regularity of the domain $\Omega \subset \mathbb{R}^n$ when the first shape derivative of the eigenvalue of Dirichlet Laplacian does not exist
Thank you for any suggestions or references.
I am searching for the regularity of the domain $\Omega \subset \mathbb{R}^n$ when the first shape derivative of the eigenvalue of Dirichlet Laplacian does not exist
Thank you for any suggestions or references.
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