The real and complex convexity

• Autorzy: Jamel A.

Identyfikatory

DOI

10.7862/rf.2018.10

• Języki publikacji: EN

Abstrakty

EN

We prove that the holomorphic differential equation ϕ’’(ϕ+c) = γ(ϕ’)² (ϕ:C→C be a holomorphic function and (γ, c) ϵ C²) plays a classical role on many problems of real and complex convexity. The condition exactly γ ϵ [wzór] (independently of the constant c) is of great importance in this paper. On the other hand, let n ≥ 1, (A₁, A₂) ϵ C² and g₁, g₂ : Cᵑ → C be two analytic functions. Put u(z, w) = │A ₁w - g₁(z) │² + │A₂w - g₂(z) │²v(z,w) = │A₁w - g₁(z) │² + │ A₂w - g₂(z) │², for (z,w) ϵ Cᵑ x C. We prove that u is strictly plurisubharmonic and convex on Cᵑ x C if and only if n = 1, (A₁, A₂) ϵ C² \{0} and the functions g₁ and g₂ have a classical representation form described in the present paper. Now v is convex and strictly psh on Cᵑ x C if and only if (A₁, A₂) ϵ C² \{0}, n ϵ {1,2} and and g₁, g₂ have several representations investigated in this paper.

Słowa kluczowe

EN

analytic functions; convex functions; plurisubharmonic functions; harmonic function; inequalities; holomorphic differential equation; strictly; polynomials

PL

funkcje analityczne; funkcje wypukłe; funkcje plurisubharmoniczne; funkcje harmoniczne; nierówności; równanie różniczkowe holomorficzne; wielomiany

• Wydawca: Oficyna Wydawnicza Politechniki Rzeszowskiej
• Czasopismo: Journal of Mathematics and Applications
• Rocznik: 2018
• Tom: Vol. 41
• Strony: 123--156
• Opis fizyczny: Bibliogr. 35 poz.

Twórcy

autor

Jamel A.

• Département de Mathématiques, Faculté des Sciences de Tunis, 1060 Tunis, Tunisia

Bibliografia

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Uwagi

PL

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).