Abstract
Let A, B, D, E∈ [- 1 , 1] and let p(z) be an analytic function with fixed initial coefficient defined in the open unit disk. Conditions on A, B, D, and E are determined so that 1 + αzp′(z) being subordinated to (1 + Dz) / (1 + Ez) implies that p(z) is subordinated to (1 + Az) / (1 + Bz) and other similar implications involving 1 + αzp′(z) / p(z) , αp2(z) + λzp′(z) , αp(z) + (1 - α) p2(z) + λzp′(z) , and (1 - α) p(z) + α(1 + zp′(z) / p(z)). Also, sufficient conditions for Janowski starlikeness with fixed second coefficient are obtained.
| Original language | English |
|---|---|
| Article number | 99 |
| Journal | Afrika Matematika |
| Volume | 33 |
| Issue number | 4 |
| DOIs | |
| State | Published - Dec 2022 |
Keywords
- Analytic function
- Fixed second coefficient
- Subordination
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