Contemporary Mathematics, Volume 7 Issue 5 (2026), 4909-5078



Open Access Article

Innovative Approaches to Istrăţescu-Type Fixed Point Results via Simulation Functions in Sb-Metric Spaces with Applications

by G. Sudhaamsh Mohan Reddy, Ahmad Aloqaily, Meryem Bey, Nabil Mlaiki

ABSTRACT: Three fundamental mathematical concepts—Istrăţescu-type contractions, simulation functions, and  S b -metric spaces—are unified into a coherent framework of fixed point theory in this...

Open Access Article

Efficiency as a Quantile Process: Functional Profiles and Panel Heterogeneity in Firm Data

by Vladislav Spitsin, Lubov Spitsina, Magerram Gasanov, Victoria Leonova

ABSTRACT: This paper develops a functional extension of quantile-based frontier efficiency analysis for firm-level panel data. Instead of representing technical efficiency by a single benchmark-specific...

Open Access Article

Generalized Derivations on Infinite Distributive Lattices

by Abu Zaid Ansari, Areej Almuhaimeed, Noorbhasha Rafi, Faiza Shujat

ABSTRACT: Our goal in this study is to determine the structure of generalized derivations on an infinitely distributive lattice. Our analysis reveals that the redefined mapping acts as a generalized...

Open Access Article

Characterization of Linear Operators on Specific Classes of Algebras

by Abu Zaid Ansari, Faiza Shujat, Vishal K. Yadav

ABSTRACT: Let s ,  t ,  u  ≥ 1 be fixed integers and  K  be a Hilbert space. If  G , ∂:  A  →  A  are linear mappings that fulfill the following algebraic identity 2 G ( X s + t + u )...

Open Access Article

(p,q)-Fuzzy G-Open Sets and Associated Functions: A New Framework and Fundamental Properties

by Wafa K. Alqurashi, Islam M. Taha

ABSTRACT: This study introduces new classes of fuzzy open sets, namely ( p , q )- FG -open (resp. ( p , q )- FGP -open, ( p , q )- FGS -open, ( p , q )- FG α-open, and ( p , q )- FG γ-open) sets in double...

Open Access Article

On a Subclass of Close-to-Convex Functions Involving a Zeta–Riemann Fractional Differential Operator

by Ekram E. Ali, Georgia Irina Oros, Rabha M. El-Ashwah

ABSTRACT: This study contributes to the advancement of geometric function theory by developing new results through the application of differential subordination techniques to normalized analytic functions...