Abdullahi Umar

545 total citations
59 papers, 290 citations indexed

About

Abdullahi Umar is a scholar working on Computational Theory and Mathematics, Geometry and Topology and Discrete Mathematics and Combinatorics. According to data from OpenAlex, Abdullahi Umar has authored 59 papers receiving a total of 290 indexed citations (citations by other indexed papers that have themselves been cited), including 25 papers in Computational Theory and Mathematics, 9 papers in Geometry and Topology and 7 papers in Discrete Mathematics and Combinatorics. Recurrent topics in Abdullahi Umar's work include semigroups and automata theory (25 papers), Advanced Algebra and Logic (8 papers) and Geometric and Algebraic Topology (7 papers). Abdullahi Umar is often cited by papers focused on semigroups and automata theory (25 papers), Advanced Algebra and Logic (8 papers) and Geometric and Algebraic Topology (7 papers). Abdullahi Umar collaborates with scholars based in Nigeria, Saudi Arabia and United Kingdom. Abdullahi Umar's co-authors include Kabiru Jega Umar, Lukman Adewale Ajao, Salihu Aliyu, Augustine N. Odili, Maxwell M. Nwegbu, Akinyemi Aje, Alexander Burstein, Godsent Isiguzo, M. L. Deadman and Kabiru Sada and has published in prestigious journals such as SHILAP Revista de lepidopterología, The FASEB Journal and Journal of Algebra.

In The Last Decade

Abdullahi Umar

46 papers receiving 261 citations

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name h Career Trend Papers Cites
Abdullahi Umar Nigeria 10 200 83 46 38 35 59 290
R. McFadden United States 12 383 1.9× 98 1.2× 49 1.1× 154 4.1× 36 1.0× 30 449
Vinayak Joshi India 10 108 0.5× 60 0.7× 45 1.0× 35 0.9× 4 0.1× 36 254
Bartosz Walczak Poland 7 87 0.4× 25 0.3× 42 0.9× 9 0.2× 3 0.1× 27 110
Arieh Lev Israel 7 140 0.7× 32 0.4× 90 2.0× 3 0.1× 3 0.1× 27 230
Ayesha Asloob Qureshı Türkiye 8 92 0.5× 102 1.2× 38 0.8× 2 0.1× 4 0.1× 29 183
Norbert Polat France 10 247 1.2× 161 1.9× 86 1.9× 8 0.2× 1 0.0× 53 285
Jens Zumbrägel Germany 6 44 0.2× 11 0.1× 5 0.1× 17 0.4× 6 0.2× 24 97
Adriana Hansberg Spain 12 325 1.6× 83 1.0× 79 1.7× 5 0.1× 3 0.1× 37 352
Vincenzo Marra Italy 9 226 1.1× 27 0.3× 9 0.2× 56 1.5× 45 270
Michael R. Darnel United States 7 114 0.6× 36 0.4× 7 0.2× 55 1.4× 32 142

Countries citing papers authored by Abdullahi Umar

Since Specialization
Citations

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

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

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-authorship network of co-authors of Abdullahi Umar

This figure shows the co-authorship network connecting the top 25 collaborators of Abdullahi Umar. A scholar is included among the top collaborators of Abdullahi Umar based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Abdullahi Umar. Abdullahi Umar is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

20 of 20 papers shown
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Klein, Georg, et al.. (2024). Combinatorial results for order-preserving partial injective contraction mappings. Contributions to Discrete Mathematics. 19(2). 1–19.
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Umar, Abdullahi, et al.. (2024). PERFORMANCE EVALUATION OF ACTIVATED CARBON PRODUCED FROM CORNCOB, COW BONE, AND COCONUT SHELL AS A FILTER MEDIUM. FUDMA Journal of Sciences. 8(3). 226–234.
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Umar, Abdullahi, et al.. (2018). Evaluation of Unsteady Open Channel Flow Characteristics over Crump Weir. ATBU Journal of Science, Technology & Education. 6(4). 306–315. 1 indexed citations
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Umar, Abdullahi, et al.. (2018). Radial Distribution Network Enhancement with D-Statcom Using Bacterial Foraging Algorithm. SHILAP Revista de lepidopterología. 14(2). 249–260. 4 indexed citations
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Umar, Abdullahi, et al.. (2018). COMBINATORIAL RESULTS FOR CERTAIN SEMIGROUPS OF ORDER-DECREASING PARTIAL ISOMETRIES OF A FINITE CHAIN. 19(1). 29–49. 1 indexed citations
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Umar, Abdullahi. (2014). Some combinatorial problems in the theory of partial transformation semigroups. The scientific electronic library of periodicals of the National Academy of Sciences of Ukraine (National Academy of Sciences of Ukraine). 17(1). 110–134. 1 indexed citations
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Umar, Abdullahi, et al.. (2014). Combinatorial results for certain semigroups of partial isometries of a finite chain. The Australasian Journal of Combinatorics. 58(3). 365–375. 6 indexed citations
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Umar, Abdullahi. (2011). Combinatorial results for semigroups of orientation-preserving partial transformations. Journal of integer sequences. 14(7). 1 indexed citations
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Umar, Abdullahi, et al.. (2007). Convolution of Two Series. 21(2). 6–11. 1 indexed citations
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Umar, Abdullahi, et al.. (2006). Asymptotic Results for Semigroups of Order-Preserving Partial Transformations. Communications in Algebra. 34(3). 1071–1075. 2 indexed citations
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Umar, Abdullahi, et al.. (2004). Combinatorial Results for Semigroups of Order-Decreasing Partial Transformations. Journal of integer sequences. 7(3). 38. 5 indexed citations
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Umar, Abdullahi, et al.. (2004). Combinatorial results for semigroups of order-preserving partial transformations. Journal of Algebra. 278(1). 342–359. 23 indexed citations
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Umar, Abdullahi. (1998). Enumeration of certain finite semigroups of transformations. Discrete Mathematics. 189(1-3). 291–297. 1 indexed citations
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Umar, Abdullahi. (1993). On the semigroups of partial one-to-one order-decreasing finite transformations. Proceedings of the Royal Society of Edinburgh Section A Mathematics. 123(2). 355–363. 16 indexed citations
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Umar, Abdullahi. (1992). On the semigroups of order-decreasing finite full transformations. Proceedings of the Royal Society of Edinburgh Section A Mathematics. 120(1-2). 129–142. 46 indexed citations

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.

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