M. Abtahi

activity

20122025

most citedFixed point theorems for Meir-Keeler type contractions in metric spaces

8 citations · 24 across the 13 of their papers we have counts for

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Showing 2022Show all

2 papers · 1 filter

math.FA2022★ 5 cited

An extension of Birkhoff--James orthogonality relations in semi-Hilbertian space operators

S. M. Enderami, M. Abtahi, A. Zamani

Let $B (H)$ denote the $C^{*}$ -algebra of all bounded linear operators on a Hilbert space $(H, ⟨ \cdot, \cdot ⟩)$ . Given a positive…

math.FA2022

An orthogonality relation in complex normed spaces based on norm derivatives

S. M. Enderami, M. Abtahi, A. Zamani +1

Let $X$ be a complex normed space. Based on the right norm derivative $ρ_{_{+}}$ , we define a mapping $ρ_{_{\infty}}$ by \begin{equation*} ρ_{_{\infty}}(x,y) = \frac1π\int_0^{2π}e^…