Arber Avdullahu

Arber Avdullahu is a Kosovar mathematician who represented Kosovo at the International Mathematical Olympiad in 2015 and 2016, earning an Honourable Mention at IMO 2016 (rank 429/602, 8 points). He later moved into mathematical research, co-authoring work on graph topological indices with Slobodan Filipovski (University of Primorska) and on Merkle-tree cryptography with Lum Ramabaja. His published research spans combinatorics (graph energy and irregularity indices) and blockchain-oriented cryptographic data structures (compact Merkle multiproofs).

Notes5

• Represented Kosovo at the 57th IMO (2016), ranked 429/602 with 8 points and an Honourable Mention (P1=1, P4=7).Jul 2016
• Co-authored 'On certain topological indices of graphs' with Slobodan Filipovski (University of Primorska, Slovenia), published in Czechoslovak Mathematical Journal 76(3):723-736, 2026 (arXiv preprint Oct 2022).Jun 18, 2026
• Transition from IMO competition mathematics (2015-2016) to published research (crypto 2020, graph theory 2022-2026) shows a trajectory from olympiad competitor to academic researcher in combinatorics and cryptography.Oct 24, 2022
• Co-authored 'Compact Merkle Multiproofs' (arXiv:2002.07648, Feb 2020) with Lum Ramabaja, a cryptography paper in the Merkle-tree / sparse-proof line of work.Feb 18, 2020
• Also represented Kosovo at IMO 2015 (rank 532/577, 1 point), one of a small cohort of repeat Kosovo IMO contestants in the country's early IMO years.Jul 2015