Results 21 to 30 of about 998 (123)
Simple sufficient conditions for starlikeness and convexity for meromorphic functions
Open Mathematics, 2016 In this paper we investigate some extensions of sufficient conditions for meromorphic multivalent functions in the open unit disk to be meromorphic multivalent starlike and convex of order α.
Goswami Pranay +2 more
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Journal of Mathematical Inequalities, 2021 In this paper we introduce and investigate a new generalized class of bi-bazilevič functions defined by using (s,t) -derivative operator and quasi-subordination in the open unit disk D .
Aoen, S. Li, Huo Tang
semanticscholar +1 more source
The class of functions spirallike with respect to a boundary point
International Journal of Mathematics and Mathematical Sciences, Volume 2004, Issue 40, Page 2133-2143, 2004., 2004 The aim of this paper is to present an analytic characterization of the class of functions δ‐spirallike with respect to a boundary point. The method of proof is based on Julia′s lemma.
Adam Lecko
wiley +1 more source
Convolutions of harmonic right half-plane mappings
Open Mathematics, 2016 We first prove that the convolution of a normalized right half-plane mapping with another subclass of normalized right half-plane mappings with the dilatation −z(a+z)/(1+az)$ - z(a + z)/(1 + az)$ is CHD (convex in the horizontal direction) provided a=1$a
Li YingChun, Liu ZhiHong
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[Retracted] Partial sums of functions of bounded turning
International Journal of Mathematics and Mathematical Sciences, Volume 2004, Issue 1, Page 45-47, 2004., 2004 We determine conditions under which the partial sums of the Libera integral operator of functions of bounded turning are also of bounded turning.
Jay M. Jahangiri, K. Farahmand
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Meromorphic functions with positive coefficients
International Journal of Mathematics and Mathematical Sciences, Volume 2004, Issue 6, Page 319-324, 2004., 2004 Let ∑∗(α, β, k) be a class of meromorphic functions f(z) with positive coefficients in D = {0 < |z| < 1}. The aim of the present note is to prove some properties for the class ∑∗(α, β, k).
Maslina Darus
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(α, β, λ, δ, m, Ω)p−Neighborhood for some families of analytic and multivalent functions
Analele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica, 2015 In the present investigation, we give some interesting results related with neighborhoods of p−valent functions. Relevant connections with some other recent works are also pointed out.
Orhan Halit
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Partial sums of the Rabotnov function
Acta Universitatis Sapientiae: Mathematica, 2022 This article deals with the ratio of normalized Rabotnov function ℝα,β (z) and its sequence of partial sums (ℝα,β)m (z). Several examples which illustrate the validity of our results are also given.
Kazımoğlu Sercan, Deniz Erhan
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Coefficient estimates for Ruscheweyh derivatives
International Journal of Mathematics and Mathematical Sciences, Volume 2004, Issue 36, Page 1937-1942, 2004., 2004 We consider functions f, analytic in the unit disc and of the normalized form f(z)=z+∑n=2∞anzn. For functions f∈R¯δ(β), the class of functions involving the Ruscheweyh derivatives operator, we give sharp upper bounds for the Fekete‐Szegö functional |a3−μa22|.
Maslina Darus, Ajab Akbarally
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Some properties of analytic functions related with Booth lemniscate
Acta Universitatis Sapientiae: Mathematica, 2018 The object of the present paper is to study of two certain subclass of analytic functions related with Booth lemniscate which we denote by ℬ𝒮 (α) and ℬ𝒦 (α). Some properties of these subclasses areconsidered.
Najmadi P., Najafzadeh Sh., Ebadian A.
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