Summary
In this note we derive new lower bounds for the first eigenvalue of the Laplacian in a boundedn-dimensional domain with Dirichlet boundary conditions. The lower bounds obtained are related to those of Cheeger (1970) [2] and Osserman (1977) [6], and they turn out to be sharper when the domain is not too far from being a ball.
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This work has been supported by the DGICYT project PB86-0306. It was done while the second author was visiting the Department of Mathematics of Heriot-Watt University, with the support of a Fleming Award 1988/89.
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Avinyó, A., Mora, X. Lower bounds of Cheeger-Osserman type for the first eigenvalue of then-dimensional fixed membrane problem. Z. angew. Math. Phys. 41, 426–430 (1990). https://doi.org/10.1007/BF00959989
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DOI: https://doi.org/10.1007/BF00959989