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On certain subclasses of multivalently meromorphic close-to-convex maps

K. S. Padmanabhan (1998)

Annales Polonici Mathematici

Let Mₚ denote the class of functions f of the form f ( z ) = 1 / z p + k = 0 a z k , p a positive integer, in the unit disk E = |z| < 1, f being regular in 0 < |z| < 1. Let L n , p ( α ) = f : f M , R e - ( z p + 1 / p ) ( D f ) ' > α , α < 1, where D f = ( z n + p f ( z ) ) ( n ) / ( z p n ! ) . Results on L n , p ( α ) are derived by proving more general results on differential subordination. These results reduce, by putting p =1, to the recent results of Al-Amiri and Mocanu.

On classes of uniformly starlike functions

Agnieszka Wiśniowska-Wajnryb (2013)

Annales Polonici Mathematici

We geometrically define subclasses of starlike functions related to the class of uniformly starlike functions introduced by A. W. Goodman in 1991. We give an analytic characterization of these classes, some radius properties, and examples of functions in these classes. Our classes generalize the class of uniformly starlike functions, and many results of Goodman are special cases of our results.

On coefficient inequalities in the Carathéodory class of functions

Adam Lecko (2000)

Annales Polonici Mathematici

Some inequalities are proved for coefficients of functions in the class P(α), where α ∈ [0,1), of functions with real part greater than α. In particular, new inequalities for coefficients in the Carathéodory class P(0) are given.

On complexification and iteration of quasiregular polynomials which have algebraic degree two

Ewa Ligocka (2005)

Fundamenta Mathematicae

We prove that each degree two quasiregular polynomial is conjugate to Q(z) = z² - (p+q)|z|² + pqz̅² + c, |p| < 1, |q| < 1. We also show that the complexification of Q can be extended to a polynomial endomorphism of ℂℙ² which acts as a Blaschke product (z-p)/(1-p̅z) · (z-q)/(1-q̅z) on ℂℙ²∖ℂ². Using this fact we study the dynamics of Q under iteration.

On conformal dilatation in space.

Bishop, Christopher J., Gutlyanskiĭ, Vladimir Ya., Martio, Olli, Vuorinen, Matti (2003)

International Journal of Mathematics and Mathematical Sciences

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