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General Mathematics Vol. 19, No. 1 (2011), 99–107

An Investigation on Minimal Surfaces of Multivalent Harmonic Functions

1

Hakan Mete Ta¸stan, Ya¸sar Polato˜glu

Abstract

The projection on the base plane of a regular minimal surfaceSinR3 with isothermal parameters defines a complex-valued univalent harmonic functionf =h(z) +g(z). The aim of this paper is to obtain the distor- tion inequalities for the Weierstrass-Enneper parameters of the minimal surface for the harmonic multivalent functions for which analytic part is anm-valent convex function.

2000 Mathematics Subject Classification: Primary 30C99; Secondary 31A05, 53A10, 30C55

Key words and phrases: Minimal surface; multivalent harmonic function;

convex function; distortion theorem; isothermal parametrization;

Weierstrass-Enneper representation.

References

[1] M.Chuaqui, P. Duren and B. Osgood , The Schwarzian derivative for harmonic mappings, J. Analyse Math 91 (2003), 329-351.

[2] R. Dey, The Weierstrass-Enneper representation using hodographic co- ordinates on a minimal surface, Proc. Indian Acad. Sci.(Math.Sci) 113 (2003), No. 2, 189-193.

[3] P. Duren, Univalent functions, Grundlehren der Mathematiscen Wissenchaften 259, Springer-Verlag, Berlin, New York, 1983.

1Received 20 April, 2009

Accepted for publication (in revised form) 14 December, 2009

99

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100 Hakan Mete Ta¸stan, Ya¸sar Polato˜glu [4] P. Duren,Harmonic mappings in the plane, Cambridge University Press,

Cambridge U.K, 2004

[5] Z. Lewandoski, Starlike madorants and subordination, Annales Universi- tatis, Mariae-Curie Sklodowska, Lublin-Polonia 15 (1961), 79-84.

[6] M.K. Aouf,p−valent classes related to convex functions of complex order, Rocky Mauntain Journal of Mathematics 4 (1961).

[7] O.P. Ahuja and J.M. Jahangiri, Multivalent harmonic starlike functions, Ann. Univ Marie-Cruie Sklodowska, Sect A 55 (2001), 1-13.

[8] O.P. Ahuja and J.M. Jahangiri, On a linear combination of the classes of multivalently harmonic functions, Kyungpook. Math. J. 42(1) (2002), 61-70.

[9] J. Clunie and T. Sheil-Small,Harmonic Univalently functions, Ann Acad Sci Fenn Ser A.I. Math 9(3) (1984), 3-25.

[10] Waggas Galip Atshan and S.R. Kulkarni, New classes of multivalently harmonic functions, Int. Journal of Math.Analysis 2 (2008), No 3, 111- 121.

[11] O.P. Ahuja and J.M. Jahangiri, Multivalent harmonic starlike functions with missing coefficients, Math. Sci. Res. J 7(9) (2003), 347-352.

[12] O. Murugusundaramorthy, K. Vijaya and T. Rosy,Multivalent meromor- phic harmonic functions with missing coefficients, Far East. J. Math. Sci.

7(1) (2002), 33-44.

[13] P. Duren, W. Hengartner and R.S. Laugerer, The argument principle for harmonic functions, Amer. Math. Montly 103(5) (1996), 411-415.

Hakan Mete Ta¸stan

˙Istanbul University

Department of Mathematics Vezneciler 34134, ˙Istanbul, Turkey e-mail: [email protected] Ya¸sar Polato˜glu

˙Istanbul K¨ult¨ur University

Department of Mathematics and Computer Science Atak¨oy, 34156, ˙Istanbul, Turkey

e-mail: [email protected]

参照

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