A note on a Theorem of Ermakov
Mazhar, S.M., Al-Budaiwi, Aisha (1987)
Portugaliae mathematica
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Displaying similar documents to “Some remarks on a theorem of S.M. Lozinski concerning linear process of approximation of periodic functions”
A note on a Theorem of Ermakov
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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...
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