Abstract. Sufficient conditions for functions to be starlike of order γ have been studied by authors Ramesha et al. and Nunokawa et al. Sufficient conditions for convexity involving higher order derivatives were investigated by Silverman. Taking ideas from the works of many authors we obtain interesting sufficient conditions for functions involving higher order derivatives to be univalently convex of order γ (0 ≤ γ < 1), using a well known best result in function theory and obtain as a special case, conditions of sufficiency for convexity if they belong to Am and A := A1.
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References
[1] P.L. Duren, Univalent Functions, Springer, New York (1983).
[2] M. Elumalai and C. Selvaraj, Sufficient conditions for multivalent functions of order, Int. J. Pure and Appl. Math., 109, No 9 (2016), 230–237.
[3] A.W. Goodman, Univalent Functions, Vol. I & II, Mariner, Tampa, FL (1983).
[4] Jian-Lin Li and S. Owa, Sufficient conditions for starlikeness, Indian J. Pure and Appl. Math., 33, No 3 (2002), 313-318.
[5] S.S. Miller and P.T. Mocanu, Differential subordinations and inequalities in the complex plane, J. Diff. Eqns., 67, No 2 (1987), 199-211.
[6] S.S. Miller and P.T. Mocanu, Differential Subordinations: Theory and Applications, Ser. on Monographs and Textbooks in Pure and Appl. Math., 225, Marcel Dekker, New York (2000).
[7] M. Nunokawa, S. Owa, S.K. Lee, M. Obradovic, M.K. Aouf, H. Saitoh, A. Ikeda and N. Koike, Sufficient conditions for starlikeness, Chinese J. Math., 24, No 3 (1996), 265-271.
[8] Ch. Pommerenke, Univalent Functions, Vandenhoek and Ruprecht, Gottingen (1975).
[9] M.S. Robertson, On the theory of univalent functions, Annals of Math., 37, No 2 (1936), 374-408.
[10] C. Ramesha, K. Sampath and K.S. Padmanabhan, Sufficient conditions for starlikeness, Chinese J. Math., 23, No 2 (1995), 167-171.
[11] V. Ravichandran, Certain applications of first order differential subordination, Far East J. Math. Sci., 12, No 1 (2004), 41-51.
[12] H. Silverrman, Higher order derivatives, Chinese J. Math., 23 (1995), 189-191.