Literature cited
G. H. Hardy, J. E. Littiewood, and G. Polya, Inequalities, Cambridge Univ. Press, London (1959).
O. A. Ladyzhenskaya and N. N. Ural'tseva, Linear and Quasilinear Elliptic Equations, Academic Press, New York (1968).
A. L. Treskunov, “The modulus of continuity of the solutions of a second-order elliptic equation in the plane,” Mat. Zametki,15, No. 1, 139–148 (1974).
Additional information
Translated from Zapiski Nauchnykh Seminarov Leningradskogo Otdeleniya Matematicheskogo Instituta im. V. A. Steklova AN SS.SR, Vol. 147, pp. 184–187, 1985.
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Treskunov, A.L. A generalization of wirtinger's inequality and its application to the investigation of elliptic equations. J Math Sci 37, 905–908 (1987). https://doi.org/10.1007/BF01387731
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DOI: https://doi.org/10.1007/BF01387731