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Proceedings of the American Mathematical Society

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On S. Bernstein's theorem on surfaces $ z(x,y)$ of nonpositive curvature


Author: Eberhard Hopf
Journal: Proc. Amer. Math. Soc. 1 (1950), 80-85
MSC: Primary 27.0X
MathSciNet review: 0035803
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DOI: http://dx.doi.org/10.1090/S0002-9939-1950-0035803-7
Article copyright: © Copyright 1950 American Mathematical Society