238 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Nantes UniversitéFR266 papers
- Centre National de la Recherche ScientifiqueFR187 papers
- Université de NantesFR152 papers
- École Centrale de NantesFR48 papers
- Laboratoire de Mathématiques d'OrsayFR36 papers
- Institut de recherche mathématique de RennesFR25 papers
- Institut FourierFR25 papers
- Université Paris-SudFR25 papers
- Université Paris-SaclayFR17 papers
- Institut national de recherche en sciences et technologies du numériqueFR12 papers
- Analyse, Géométrie et ModélisationFR11 papers
- Institut de Mathématiques de BordeauxFR11 papers
Showing 2015 · math.SPShow all
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math.SP2015★ 7 cited
The weak Pleijel theorem with geometric control
Pierre Bérard, Bernard Helffer
Let , be a bounded open set, and denote by , the eigenvalues of the Dirichlet Laplacian arranged in nondecreasing order, with mul…
math.SP2015★ 3 cited
On nodal domains in Euclidean balls
Bernard Helffer, Mikael Persson Sundqvist
Å. Pleijel (1956) has proved that in the case of the Laplacian with Dirichlet condition, the equality in the Courant nodal theorem (Courant sharp situation) can only be true for a…