SCIENTIFIC WORKS, VOL. 40, BOOK 3, 2025 – MATHEMATICS

Valentin Georgiev, Vasil Zhelinski, Boyan Zlatanov
Best Proximity Pairs of Noncyclic Mappings with a Cotractive Iterate on P Steps, 1-16

Hristo Kiskinov, Milena Petkova, Andrey Zahariev
Why and How the Definition of the Conformable Derivative in the Lower Terminal Should be Changed, 17-29

Snezhana Hristova
Boundary Value Problems for Difference Equations and Ulam-Hyers Stability, 30-40

Sofia Ducheva, Marta Teofilova
On Some Examples of Complex Norden Manifolds, 41-54

Martin Pavlov, Vasil Zhelinski, Boyan Zlatanov
A Fixed Point Approach to the Stackelberg Model in Oligopoly Markets, 55-68