Souvik Biswas

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math.CV2026

Radius of convexity of certain classes of functions defined by convolution

Bappaditya Bhowmik, Souvik Biswas

Let $S$ be the class of analytic univalent functions defined in the open unit disc $D$ of the complex plane with the normalizations $f (0) = 0$ and $f^{'} (0) = 1$ . For $…

math.CV2026

Radius of starlikeness of $S * S t (I^\pm)$

Bappaditya Bhowmik, Souvik Biswas

Let $S$ be the set of all analytic univalent functions $f$ defined in the open unit disc $D$ , with $f (0) = 0 = f^{'} (0) - 1$ . For $I^\pm \in [0, 1)$ , let $S t (I^\pm)$ be…

math.CV2024

On the radius of concavity for certain classes of functions

Bappaditya Bhowmik, Souvik Biswas

Let $A$ denote the class of all analytic functions $f$ defined in the open unit disc $D$ with the normalization $f (0) = 0 = f^{'} (0) - 1$ and let $P^{'}$ be the class of fun…

Radius of convexity of certain classes of functions defined by convolution

Radius of starlikeness of S∗St(I^±)

On the radius of concavity for certain classes of functions

Radius of starlikeness of $S * S t (I^\pm)$