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Remarks on Courant’s nodal line theorem. (English) Zbl 0070.32604

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[1] and , Methoden der mathematischen Physik, Vol. I, Springer, Berlin, 1931. · doi:10.1007/978-3-642-47436-1
[2] English Edit., Methods of Mathematical Physics, Vol. I, Interscience, New York, 1953.
[3] Beweis, dass unter allen homogenen Membranen von gleicher Fläche und gleicher Spannung die kreisförmige den tiefsten Grundton gibt, S.-B. Math.-Nat. Kl. Bayer. Akad. Wiss., 1923, pp. 169–172.
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[5] Krahn, Math. Ann. 94 pp 97– (1924)
[6] Payne, J. Rat. Mech. Anal. 4 (1955)
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[8] Pólya, J. Math. Physics 31 pp 55– (1952) · doi:10.1002/sapm195231155
[9] and , Isoperimetric inequalities in mathematical physics, Annals of Math. Studies No. 27, Princeton University Press, 1951. · Zbl 0044.38301 · doi:10.1515/9781400882663
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