scholarly journals Some properties for certain class of bi-univalent functions defined by $ q $-Cătaş operator with bounded boundary rotation

2021 ◽  
Vol 7 (1) ◽  
pp. 903-914
Author(s):  
S. M. Madian ◽  

<abstract><p>Throughout the paper, we introduce a new subclass $ \mathcal{H}_{\alpha, \mu, \rho, m, \beta }^{n, q, \lambda, l}\ f(z)$ by using the Bazilevič functions with the idea of bounded boundary rotation and $ q $-analogue Cătaş operator. Also we find the estimate of the coefficients for functions in this class. Finally, in the concluding section, we have chosen to reiterate the well-demonstrated fact that any attempt to produce the rather straightforward $ (p, q) $-variations of the results, which we have presented in this article, will be a rather trivial and inconsequential exercise, simply because the additional parameter $ p $ is obviously redundant.</p></abstract>


2018 ◽  
Vol 16 (1) ◽  
pp. 1161-1169
Author(s):  
Varadharajan Radhika ◽  
Jay M. Jahangiri ◽  
Srikandan Sivasubramanian ◽  
Gangadharan Murugusundaramoorthy

AbstractWe consider the Toeplitz matrices whose elements are the coefficients of Bazilevič functions and obtain upper bounds for the first four determinants of these Toeplitz matrices. The results presented here are new and noble and the only prior compatible results are the recent publications by Thomas and Halim [1] for the classes of starlike and close-to-convex functions and Radhika et al. [2] for the class of functions with bounded boundary rotation.



1992 ◽  
Vol 23 (4) ◽  
pp. 321-325
Author(s):  
KUALIDA INAYAT NOOR

Let $H = (H, \oplus, \odot)$ denote the real linear space of locally univalent normalized functions in the unit disc as defined by Hornich. For $-1\le B <A\le 1$, $k>2$, the classes $V_k[A,B]$ of functions with bounded boundary rotation are introduced and this linear space structure is used to determine the extreme points of the classes $V_k[A,B]$.





2015 ◽  
Vol 267 ◽  
pp. 790-794
Author(s):  
Yaşar Polatog̃lu ◽  
Melike Aydog̃an ◽  
Yasemin Kahramaner


Sign in / Sign up

Export Citation Format

Share Document