Approximation properties of the partial sums of Fourier series of some almost periodic functions
Paulina Pych-Taberska (1990)
Studia Mathematica
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Paulina Pych-Taberska (1990)
Studia Mathematica
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D. Przeworska-Rolewicz (1968)
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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...
Siddiqi, Rafat N. (1979)
Portugaliae mathematica
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Annali della Scuola Normale Superiore di Pisa - Classe di Scienze
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Ferenc Móricz (1989)
Studia Mathematica
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R. Taberski (1979)
Banach Center Publications
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Elabbasy, E., Hassan, T., Saker, S. (2005)
Serdica Mathematical Journal
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2000 Mathematics Subject Classification: 34K15, 34C10. We obtain necessary and sufficient conditions for the oscillation of all solutions of neutral differential equation with mixed (delayed and advanced) arguments ...