期刊
SYMMETRY-BASEL
卷 15, 期 6, 页码 -出版社
MDPI
DOI: 10.3390/sym15061176
关键词
Hankel determinant; close-to-convex functions; Schwarz functions
This paper investigates the classes of functions N (convex in one direction) and M (zf'(z), where f ? N) and provides estimates for the third-order Hankel determinants of these functions. The obtained estimates for H-3,H-1(f) in the paper are improved.
LetN be the class of functions that convex in one direction and M denote the class of functions zf'(z) , where f ? N. In the paper, the third-order Hankel determinants for these classes are estimated. The estimates of H-3,H-1(f) obtained in the paper are improved.
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