Summary
Two lower bounds of Sperb for the first eigenvalue of an elastically attached membrane are proved in an elementary way.
Zusammenfassung
Zwei untere Schranken von Sperb für den tiefsten Eigenwert einer elastisch gestützten Membran werden in einfacher Weise nachgewiesen.
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References
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This work supported by the Department of the Navy, Naval Ordnance Systems Command under Contract N00017-72-C-4401.
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Kuttler, J.R. A note on a paper of Sperb. Journal of Applied Mathematics and Physics (ZAMP) 24, 431–434 (1973). https://doi.org/10.1007/BF01595208
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DOI: https://doi.org/10.1007/BF01595208