The Second Hankel Determinant Problem for a Class of Bi-Close-to-Convex Functions
Keyword(s):
Class C
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The purpose of the present work is to determine a bound for the functional H 2 ( 2 ) = a 2 a 4 − a 3 2 for functions belonging to the class C Σ of bi-close-to-convex functions. The main result presented here provides much improved estimation compared with the previous result by means of different proof methods than those used by others.
2017 ◽
Vol 355
(10)
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pp. 1063-1071
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2016 ◽
Vol 95
(3)
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pp. 436-445
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Keyword(s):