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On the smoothness of superharmonics which solve a minimum problem. (English) Zbl 0206.40702

31B05 Harmonic, subharmonic, superharmonic functions in higher dimensions
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[1] M. Brelot, Éléments de la Théorie Classique du Potentiel, Paris.
[2] H. Brezis and G. Stampacchia, Sur la régularité de la solution d’inéquations elliptiques,Bull. Soc. Math. France,96 (1968), p. 153.
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[4] A. S. Besicovitch, A general form of the covering principle and relative differentiation of additive functions,Proc. Cambridge Phil. Soc.,41 (1945), p. 103. · Zbl 0063.00352
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