4 papers · 1 filter
Characterizations of closed EP operators on Hilbert spaces
Arup Majumdar, P. Sam Johnson
In this paper, we present intriguing findings that characterize both the closed (unbounded) and bounded EP operators on Hilbert spaces. Additionally, we demonstrate the result $γ(T…
The Moore-Penrose inverses of unbounded closable operators and the Cartesian product of closed operators in Hilbert spaces
Arup Majumdar, P. Sam Johnson
In this paper, we present some interesting results to characterize the Moore-Penrose inverses of unbounded closable operators and the Cartesian product of closed operators in Hilbe…
Hyers-Ulam Stability of Unbounded Closable Operators in Hilbert Spaces
Arup Majumdar, P. Sam Johnson, Ram N. Mohapatra
In this paper, we discuss the Hyers-Ulam stability of closable (unbounded) operators with several interesting examples. We also present results pertaining to the Hyers-Ulam stabili…
A formula of -spectral radius for -adjoint operators on semi-Hilbertian spaces
Arup Majumdar, P. Sam Johnson
In this paper, we prove the relation , where is a positive semidefin…