GPH – International Journal of Mathematics (E-ISSN: 3050-9645), Volume 9, Issue 05 (2026) presents a collection of rigorously peer-reviewed research articles contributing to both pure and applied mathematics. The issue features studies addressing contemporary mathematical theories, computational methods, modeling techniques, and interdisciplinary applications. All manuscripts were evaluated through a stringent double-blind peer review process and published in accordance with international standards of academic excellence, research integrity, and publication ethics.