CHORWADWALA, ANISA M. H.; Mahadevan, Rajesh
(Cambridge University Press, 2015-12)
It has been shown by Kesavan (Proc. R. Soc. Edinb. A (133) (2003), 617–624) that the first eigenvalue for the Dirichlet Laplacian in a punctured ball, with the puncture having the shape of a ball, is maximum if and only ...