Geodesic
Remarks on estimating the Lebesgue functions of an orthonormal system
Sbornik. Mathematics, Tome 35 (1979) no. 1, pp. 57-62 Cet article a éte moissonné depuis la source Math-Net.Ru

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In this paper we clarify the relationship between lower bounds for Lebesgue functions and multiplicative inequalities of Gagliardo–Nirenberg type. We give simple proofs of some theorems on Lebesgue functions. Bibliography: 10 titles. 
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B. S. Kashin. Remarks on estimating the Lebesgue functions of an orthonormal system. Sbornik. Mathematics, Tome 35 (1979) no. 1, pp. 57-62. http://geodesic.mathdoc.fr/item/SM_1979_35_1_a4/

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