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Some subclasses of close-to-convex functions

Adam Lecko (1993)

Annales Polonici Mathematici

For α ∈ [0,1] and β ∈ (-π/2,π/2) we introduce the classes C β ( α ) defined as follows: a function f regular in U = z: |z| < 1 of the form f ( z ) = z + n = 1 a n z n , z ∈ U, belongs to the class C β ( α ) if R e e i β ( 1 - α ² z ² ) f ' ( z ) < 0 for z ∈ U. Estimates of the coefficients, distortion theorems and other properties of functions in C β ( α ) are examined.

Some subclasses of meromorphic and multivalent functions

Ding-Gong Yang, Jin-Lin Liu (2014)

Annales Polonici Mathematici

The authors introduce two new subclasses F p , k ( λ , A , B ) and G p , k ( λ , A , B ) of meromorphically multivalent functions. Distortion bounds and convolution properties for F p , k ( λ , A , B ) , G p , k ( λ , A , B ) and their subclasses with positive coefficients are obtained. Some inclusion relations for these function classes are also given.

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