Abdullahi Umar
Impact in
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- Advanced Combinatorial Mathematics
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- semigroups and automata theory
- Advanced Algebra and Logic
Papers in
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- semigroups and automata theory 25
- Advanced Algebra and Logic 8
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- Geometric and Algebraic Topology 7
- Co-authors
- Kabiru Jega Umar (2 shared papers)Salihu Aliyu (1 shared paper)Lukman Adewale Ajao (1 shared paper)Akinyemi Aje (2 shared papers)Godsent Isiguzo (1 shared paper)Kabiru Sada (2 shared papers)Maxwell M. Nwegbu (2 shared papers)Augustine N. Odili (2 shared papers)
- Journals
- Semigroup Forum (5 papers)Proceedings of the Royal Society of Edinburgh Section A Mathematics (2 papers)The Journal of Difference Equations and Applications (2 papers)The FASEB Journal (1 paper)Blood Pressure (1 paper)
- Partner nations
- NigeriaSaudi ArabiaUnited Kingdom
In The Last Decade
Abdullahi Umar
46 papers receiving 261 citations
Peers
Comparison fields: 5 of 71
- Discrete Mathematics and Combinatorics 46
- Computational Theory and Mathematics 200
- Geometry and Topology 83
- Algebra and Number Theory 30
- Management Science and Operations Research 38
Countries citing papers authored by Abdullahi Umar
This map shows the geographic impact of Abdullahi Umar's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Abdullahi Umar with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Abdullahi Umar more than expected).
Fields of papers citing papers by Abdullahi Umar
This network shows the impact of papers produced by Abdullahi Umar. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Abdullahi Umar. The network helps show where Abdullahi Umar may publish in the future.
Co-authors
The 22 scholars most cited alongside Abdullahi Umar, linked wherever they have co-authored with each other. Click a name or a connecting line to browse the papers they share.
All Works
Showing the 20 most-cited of 59 papers — load more, or switch the sort, to bring in the rest.
| # | Work | ||
|---|---|---|---|
| 1 | 1992 | 46 | |
| 2 | 2006 | 27 | |
| 3 | 2004 | 23 | |
| 4 | 2004 | 21 | |
| 5 | 1993 | 16 | |
| 6 | 1996 | 14 | |
| 7 | 2015 | 11 | |
| 8 | 2017 | 10 | |
| 9 | 2021 | 10 | |
| 10 | 2020 | 9 | |
| 11 | 2004 | 8 | |
| 12 | 1997 | 8 | |
| 13 | 2021 | 7 | |
| 14 | Combinatorial results for certain semigroups of partial isometries of a finite chain | 2014 | 6 |
| 15 | 2007 | 6 | |
| 16 | Some combinatorial problems in the theory of symmetric inverse semigroups | 2010 | 6 |
| 17 | Combinatorial Results for Semigroups of Order-Decreasing Partial Transformations | 2004 | 5 |
| 18 | 2024 | 5 | |
| 19 | 2021 | 5 | |
| 20 | 2019 | 5 |
About Abdullahi Umar
Abdullahi Umar is a scholar working on Computational Theory and Mathematics, Geometry and Topology, Discrete Mathematics and Combinatorics, Management Science and Operations Research and Environmental Engineering, having authored 59 papers that have together received 290 indexed citations. Recurring topics across this work include semigroups and automata theory (25 papers), Advanced Algebra and Logic (8 papers), Geometric and Algebraic Topology (7 papers), Advanced Combinatorial Mathematics (5 papers), Groundwater and Watershed Analysis (4 papers), Fuzzy and Soft Set Theory (4 papers), Chemical Synthesis and Analysis (3 papers) and Mathematical Dynamics and Fractals (3 papers). The work is most often cited by research in Discrete Mathematics and Combinatorics (46 citations), Computational Theory and Mathematics (200 citations), Geometry and Topology (83 citations), Algebra and Number Theory (30 citations) and Management Science and Operations Research (38 citations). Abdullahi Umar has collaborated with scholars based in Nigeria, Saudi Arabia and United Kingdom. Frequent co-authors include Kabiru Jega Umar, Salihu Aliyu, Lukman Adewale Ajao, Akinyemi Aje, Godsent Isiguzo, Kabiru Sada, Maxwell M. Nwegbu, Augustine N. Odili, M. L. Deadman and King Fahd. Their work appears in journals such as Semigroup Forum, Proceedings of the Royal Society of Edinburgh Section A Mathematics, The Journal of Difference Equations and Applications, The FASEB Journal and Blood Pressure.
Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.