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7 papers
Logarithmic Inverse Coefficients and Moduli Differences of Janowski Class
Chayani Dhara, Nirupam Ghosh
In this paper, we study the sharp bounds of the first three logarithmic inverse coefficients for Janowski convex class . We also derive sharp upper and lower bou…
Logarithmic Coefficients Problems of Geometric Subclass of Closed-to-convex Functions
Chayani Dhara, Nirupam Ghosh
For , let be the class of all analytic functions in the unit disk with normalization and that satisfy the relation $…
On posinormality of weighted composition-differentiation operators on
Gour Hait, Sarita Ojha, Nirupam Ghosh +1
In this article, the posinormality and coposinormality of weighted composition-differentiation operators on Hardy space are investigated. It is observed that whil…
Invariant subspaces of idempotents on Hilbert spaces
Neeru Bala, Nirupam Ghosh, Jaydeb Sarkar
In the setting of operators on Hilbert spaces, we prove that every quasinilpotent operator has a non-trivial closed invariant subspace if and only if every pair of idempotents with…
Bohr type inequality for {C}esáro and {B}ernardi integral operator on simply connected domain
Vasudevarao Allu, Nirupam Ghosh
In this article, we study the Bohr type inequality for {C}esáro operator and {B}ernardi integral operator acting on the space of analytic functions defined on a simply connected do…
Coefficient Estimates for Certain Subclass of Analytic Functions Defined by Subordination
Nirupam Ghosh, A. Vasudevarao
In this article we determine the coefficient bounds for functions in certain subclasses of analytic functions defined by subordination which are related to the well-known classes o…
On Some Subclass of Harmonic Close-to-convex Mappings
Nirupam Ghosh, A. Vasudevarao
Let denote the class of harmonic functions in normalized by . For , we consider the foll…