A symmetry problem in potential theory
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Tài liệu tham khảo
Hopf, E., Elementare Bemerkungen über die Lösungen partieller Differentialgleichungen zweiter Ordnung vom elliptischen Typus. Berlin, Sber. Preuss. Akad. Wiss. 19, 147–152 (1927).
Protter, M. H., & H. F., Weinberger, Maximum Principles in Differential Equations. New Jersey: Prentice-Hall 1967.
Sokolnikoff, I. S., Mathematical Theory of Elasticity. New York: McGraw-Hill 1956.