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In this paper, we consider the generalized Roper-Suffridge extension operator defined by{Mathematical expression} for z = (z1, z2, ..., zn) ∈ Ωp1, p2, ..., pn, where 0 ≤ βj ≤ 1, 0 ≤ γj ≤ 1 - βj, pj > 1, and we choose the branch of the power functions such that (frac(f (z1), z1))βj |z1 = 0 = 1 and (f′ (z1))γj |z1 = 0 = 1, j = 1, 2, ..., n,Ωp1, p2, ..., pn = {(z1, z2, ..., zn) ∈ Cn : underover(∑, j = 1, n) | zj |pj < 1} . We prove that the set Φn, β2, γ2, ..., βn, γn (S (U)) can be embedded in Loewner chains and give the answer to the problem of Liu Taishun. We also obtain that the operator Φn, β2, γ2, ..., βn, γn (f) preserves starlikeness or spirallikeness of type α on Ωp1, p2, ..., pn for some suitable constants βj, γj, where S (U) is the class of all univalent analytic functions on the unit disc U in the complex plane C with f (0) = 0 and f′ (0) = 1. © 2007 Elsevier Inc. All rights reserved.
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Journal of Mathematical Analysis and Applications
ISSN: 0022-247X
Year: 2008
Issue: 2
Volume: 337
Page: 949-961
1 . 0 4 6
JCR@2008
1 . 2 0 0
JCR@2023
JCR Journal Grade:1
Cited Count:
SCOPUS Cited Count: 9
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 1
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