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Proceedings of the American Mathematical Society

ISSN 1088-6826(online) ISSN 0002-9939(print)



Stiffness of harmonic functions

Author: Cecilia Y. Wang
Journal: Proc. Amer. Math. Soc. 77 (1979), 103-106
MSC: Primary 30F15
MathSciNet review: 539639
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Abstract: Harmonic functions cannot change rapidly. For example, if K is a compact subset of a Riemann surface R and {u} a family of harmonic functions u on R of nonconstant sign on K, then it is known that there exists a constant $ q \in (0,1)$ independent of u such that $ {\max _K}\vert u\vert \leqslant q{\sup _R}\vert u\vert$ for all $ u \in \{ u\} $. In the present note we shall show that relations expressing such ``stiffness'' of harmonic functions can also be given for the Dirichlet norm and for the partial derivative with respect to the Green's function.

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Article copyright: © Copyright 1979 American Mathematical Society

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