On the estimation of Cesàro means of orthonormal series
J. Meder (1958)
Annales Polonici Mathematici
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J. Meder (1958)
Annales Polonici Mathematici
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P. Wojtaszczyk (2000)
Studia Mathematica
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We show that in for p ≠ 2 the constants of equivalence between finite initial segments of the Walsh and trigonometric systems have power type growth. We also show that the Riemann ideal norms connected with those systems have power type growth.
L. Young (1976)
Studia Mathematica
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Imre Z. Ruzsa, Andrzej Schinzel (1995)
Compositio Mathematica
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Bruce Berndt, Ronald Evans (1986)
Acta Arithmetica
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Gerhard Larcher (1988)
Acta Arithmetica
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Alain Haraux, Vilmos Komornik (1985)
Revista Matemática Iberoamericana
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In this paper we have collected some partial results on the sign of u(t,x) where u is a (sufficiently regular) solution of ⎧ utt + (-1)m Δmu = 0 (t,x) ∈ R x Ω ⎨ ⎩ u|Γ = ... = Δm-1 u|Γ = 0 t ∈ R. These results rely on the study of a sign of almost periodic functions of a special...
N. Ladhawala, D. Pankratz (1976)
Studia Mathematica
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