On the principal eigenvalue of second-order elliptic differential operators. (English) Zbl 0356.35065


35P15 Estimates of eigenvalues in context of PDEs
35J15 Second-order elliptic equations
47F05 General theory of partial differential operators
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[1] Donsker, Proc. Nat. Acad. Sci. U.S.A. 72 pp 780– (1975)
[2] Sion, J. Math., Vol. 8 pp 171– (1958)
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