Negative Coefficient of Starlike Functions of Order 1/2
| dc.contributor.author | Şahin, Hasan | |
| dc.contributor.author | Yıldız, İsmet | |
| dc.contributor.author | Menek, Ümran | |
| dc.date.accessioned | 2025-03-24T19:50:23Z | |
| dc.date.available | 2025-03-24T19:50:23Z | |
| dc.date.issued | 2019 | |
| dc.department | Düzce Üniversitesi | |
| dc.description.abstract | A function $g(z)$ is said to be univalent in a domain $D$ if it provides a one-to-one mapping onto its image, $g(D)$. Geometrically , this means that the representation of the image domain can be visualized as a suitable set of points in the complex plane. We are mainly interested in univalent functions that are also regular (analytic, holomorphik) in U . Without lost of generality we assume $D$ to be unit disk $U=\left\{ z:\left\vert z\right\vert <1\right\} $. One of the most important events in the history of complex analysis is Riemann's mapping theorem, that any simply connected domain in the complex plane $% %TCIMACRO{\U{2102} }% %BeginExpansion \mathbb{C} %EndExpansion $ which is not the whole complex plane, can be mapped by any analytic function univalently on the unit disk $U$. The investigation of analytic functions which are univalent in a simply connected region with more than one boundary point can be confined to the investigation of analytic functions which are univalent in $U$. The theory of univalent functions owes the modern development the amazing Riemann mapping theorem. In 1916, Bieberbach proved that for every $g(z)=z+\sum_{n=2}^{\infty }a_{n}z^{n}$ in class $S$ , $\left\vert a_{2}\right\vert \leq 2$ with equality only for the rotation of Koebe function $k(z)=\frac{z}{(1-z)^{2}}$ . We give an example of this univalent function with negative coefficients of order $\frac{1}{4}$ and we try to explain $B_{\frac{1}{4}}\left( 1,\frac{\pi }{3},-1\right) $ with convex functions. | |
| dc.identifier.endpage | 63 | |
| dc.identifier.issn | 2651-544X | |
| dc.identifier.issue | 1 | |
| dc.identifier.startpage | 61 | |
| dc.identifier.uri | https://hdl.handle.net/20.500.12684/19764 | |
| dc.identifier.volume | 2 | |
| dc.language.iso | en | |
| dc.publisher | Murat TOSUN | |
| dc.relation.ispartof | Conference Proceedings of Science and Technology | |
| dc.relation.publicationcategory | Konferans Öğesi - Ulusal - Kurum Öğretim Elemanı | |
| dc.rights | info:eu-repo/semantics/openAccess | |
| dc.snmz | KA_DergiPark_20250324 | |
| dc.subject | Analytic functions|Starlike functions|Negative coefficient|Univalent functions | |
| dc.title | Negative Coefficient of Starlike Functions of Order 1/2 | |
| dc.type | Conference Object |
