Results 121 to 123 of about 998 (123)

Certain theorems involving differential superordination and sandwich-type results

Studia Universitatis Babeş-Bolyai. Mathematica
. To obtain the main result of the present paper, we use the technique of differential superordination. As special cases of our main result, we obtain sufficient conditions for f ∈ A to be φ−like, parabolic φ−like, starlike, parabolic starlike, close-to ...
Hardeep Kaur, R. Brar, S. S. Billing
semanticscholar   +1 more source

Coefficient estimates for some subclasses of m-fold symmetric bi-univalent functions

, 2018
In the present investigation, we consider two new general subclasses HΣm(τ, γ;α) and HΣm(τ, γ;β) of Σm consisting of analytic and m-fold symmetric bi-univalent functions in the open unit disk U. For functions belonging to the two classes introduced here,
H. Srivastava, A. Zireh, Saideh Hajiparvaneh   +2 more
semanticscholar   +1 more source

Coefficient bounds for a subclass of Bi-univalent functions

, 2014
In the present paper, we introduce new subclass STΣ(b, φ) of biunivalent functions defined in the open disk. Furthermore, we find upper bounds for the second and third coefficients for functions in these new subclass using differential operator.
C. Selvaraj, T. Kumar, G. Thirupathi
semanticscholar   +1 more source