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math.CO2025

Density Characterization with The Upper Bound of Density of Fibonacci Word

Duaa Abdullah, Jasem Hamoud

This paper investigates the natural density and structural relationships within Fibonacci words, the density of a Fibonacci word is where deno…

math.CO2025

Closed-Form Analysis and Extremal Bounds of Albertson and Sigma Indices in Trees with Prescribed Degree Sequences

Jasem Hamoud, Alexey Belov Yakovlevich, Muaadh Almahalebi +1

This study explores the irregularity properties of trees with prescribed degree sequences by analyzing two prominent topological indices: the Albertson index and the sigma index. W…

math.CO2025

Bounds of Trees with Degree Sequence-Based Topological Indices on Specialized Graph Classes

Jasem Hamoud, Duaa Abdullah

In this paper, the investigates Adriatic indices, specifically the sum lordeg index where it defined as and the variable sum ex…

math.CO2025

The Density of Zero and One in Fibonacci Word for Subwords and Their Palindromes

Duaa Abdullah, Jasem Hamoud

This paper studies the density of zero and one in subwords of the Fibonacci word with lengths less than thirty and compares them to the densities of their corresponding palindromes…

math.CO2025

Applications of Combinatorics on Words with Symbolic Dynamics

Duaa Abdullah, Jasmem Hamoud

In this paper, we explore applications of combinatorics on words across various domains, including data compression, error detection, cryptographic protocols, and pseudorandom numb…

math.CO2025

On Topological Indices in Trees: Fibonacci Degree Sequences and Bounds

Jasem Hamoud, Alexei Belov-Kanel, Duaa Abdullah

In this paper, we have studied bounds based on topological indicators, from which we selected Albertson index and the Sigma index . The Sigma index was defined th…