Vladica Andrejic

Vladica Andrejic is an Associate Professor at the Faculty of Mathematics, University of Belgrade, where he teaches courses in Analytical Geometry, Geometry 4, Geometry 5, and Differential Geometry. His academic work spans both pure mathematics research and educational contributions through textbooks and course development.

Professor Andrejic's research focuses on two primary areas: differential geometry (particularly Osserman manifolds and pseudo-Riemannian geometry) and number theory (focusing on Kurepa's conjecture and factorial residues). His 18 publications between 2006-2025 demonstrate sustained scholarly activity, with recent work including significant contributions to the orthogonality principle for Osserman manifolds (2024) and equivalence between Jacobi-orthogonality and the Osserman condition (2025).

His research output shows a consistent pattern of advancing geometric theory while maintaining active engagement with computational number theory problems. The progression from foundational work on the duality principle in pseudo-Riemannian Osserman manifolds (2007) to recent breakthroughs in 2024-2025 demonstrates a deep and evolving expertise in geometric structures.

Professor Andrejic has presented his research at numerous international conferences including the Geometrical Seminar series in Serbia and the Riemannian Geometry and Applications conference in Bucharest, maintaining active connections with the global mathematical community.

As an educator, he has developed comprehensive course materials and textbooks including 'Lower Geometry' and 'Higher Geometry,' which form the foundation for his geometry courses. His lecture schedules for 2025 demonstrate continued active teaching engagement at the Faculty of Mathematics.