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math.DG2013
Extremal domains for the first eigenvalue in a general Riemannian manifold
Erwann Delay, Pieralberto Sicbaldi
We prove the existence of extremal domains with small prescribed volume for the first eigenvalue of the Laplace-Beltrami operator in any compact Riemannian manifold. This result ge…
math.DG2011
Bifurcating extremal domains for the first eigenvalue of the Laplacian
Felix Schlenk, Pieralberto Sicbaldi
We prove the existence of a smooth family of non-compact domains bifurcating from the straight cylinder for which the first eigenfunction o…