6 citations · 8 across the 5 of their papers we have counts for
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math.SP2020★ 2 cited
Courant-sharp eigenvalues of compact flat surfaces: Klein bottles and cylinders
Pierre Bérard, Bernard Helffer, Rola Kiwan
The question of determining for which eigenvalues there exists an eigenfunction which has the same number of nodal domains as the label of the associated eigenvalue (Courant-sharp…
math.SP2020★ 6 cited
Courant-sharp property for Dirichlet eigenfunctions on the Möbius strip
Pierre Bérard, Bernard Helffer, Rola Kiwan
The question of determining for which eigenvalues there exists an eigenfunction which has the same number of nodal domains as the label of the associated eigenvalue (Courant-sharp…