Here you can find the numerical solutions associated to the first eight eigenvalues of the Neumann Laplacian on degenerated densities as explained in the paper "Maximization of Neumann eigenvalues" (D. Bucur, E. Martinet, E. Oudet). The pre-print is available at https://arxiv.org/abs/2204.11472.
To display these files, you first need to install MEDIT (https://www.ljll.math.upmc.fr/frey/logiciels/Docmedit.dir/index.html)
In the command-line, run
git clone https://github.com/EloiMartinet/Maximization_Of_Neumann_Eigenvalues.git
cd Maximization_Of_Neumann_Eigenvalues
medit mu_*