An extension of certain maximum principles. (English) Zbl 0115.31201

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[1] Hopf, E. ?Elementare Bemerkungen über die Lösungen partieller Differentialgleichungen zweiter Ordnung vom elliptischen Typus?, Sitzber. Akad. der Wiss. Berlin (1927), 147-152. · JFM 53.0454.02
[2] Redheffer, R. M. ?Maximum Principles and Duality?, Monatshefte für Math. 62 (1958), 56-75. · Zbl 0094.29901
[3] Whyburn, ?Analytic Topology? Am. Math. Sco. Colloq. Publications, Vol XXVII (1942), p. 15. · Zbl 0061.39301
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