E. A. O’Brien

3.1k total citations
103 papers, 1.7k citations indexed

About

E. A. O’Brien is a scholar working on Discrete Mathematics and Combinatorics, Artificial Intelligence and Geometry and Topology. According to data from OpenAlex, E. A. O’Brien has authored 103 papers receiving a total of 1.7k indexed citations (citations by other indexed papers that have themselves been cited), including 83 papers in Discrete Mathematics and Combinatorics, 50 papers in Artificial Intelligence and 45 papers in Geometry and Topology. Recurrent topics in E. A. O’Brien's work include Finite Group Theory Research (82 papers), Coding theory and cryptography (48 papers) and graph theory and CDMA systems (28 papers). E. A. O’Brien is often cited by papers focused on Finite Group Theory Research (82 papers), Coding theory and cryptography (48 papers) and graph theory and CDMA systems (28 papers). E. A. O’Brien collaborates with scholars based in New Zealand, United Kingdom and United States. E. A. O’Brien's co-authors include Bettina Eick, C. R. Leedham-Green, Derek F. Holt, Martin W. Liebeck, M. F. Newman, Jianbei An, Aner Shalev, Pham Huu Tiep, Michael Vaughan-Lee and Robert A. Wilson and has published in prestigious journals such as Nucleic Acids Research, Neurology and IEEE Transactions on Information Theory.

In The Last Decade

E. A. O’Brien

98 papers receiving 1.5k citations

Peers — A (Enhanced Table)

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

Name	h						Papers	Cites
E. A. O’Brien New Zealand	21	1.2k	829	674	403	332	103	1.7k
Robert M. Guralnick United States	28	2.1k 1.7×	1.2k 1.4×	1.2k 1.8×	807 2.0×	734 2.2×	214	2.9k
Ernest E. Shult United States	19	833 0.7×	411 0.5×	331 0.5×	480 1.2×	140 0.4×	77	1.2k
Ronald J. Evans United States	16	239 0.2×	332 0.4×	296 0.4×	196 0.5×	215 0.6×	72	1.1k
Jack H. Koolen South Korea	18	847 0.7×	378 0.5×	873 1.3×	449 1.1×	107 0.3×	171	1.5k
Miklós Bóna United States	17	659 0.5×	371 0.4×	110 0.2×	186 0.5×	128 0.4×	68	964
Tomaž Pisanski Slovenia	22	489 0.4×	227 0.3×	676 1.0×	373 0.9×	44 0.1×	149	1.8k
Tatsuro Ito Japan	20	1.1k 0.9×	539 0.7×	735 1.1×	629 1.6×	170 0.5×	46	1.5k
Robert W. Robinson United States	24	399 0.3×	193 0.2×	447 0.7×	163 0.4×	207 0.6×	93	1.7k
Derek F. Holt United Kingdom	17	927 0.7×	625 0.8×	624 0.9×	353 0.9×	296 0.9×	114	1.3k
Marston Conder New Zealand	23	1.3k 1.1×	501 0.6×	812 1.2×	558 1.4×	353 1.1×	143	1.6k

Countries citing papers authored by E. A. O’Brien

Since Specialization

Citations

This map shows the geographic impact of E. A. O’Brien'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 E. A. O’Brien with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites E. A. O’Brien more than expected).

Fields of papers citing papers by E. A. O’Brien

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by E. A. O’Brien. 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 E. A. O’Brien. The network helps show where E. A. O’Brien may publish in the future.

Co-authorship network of co-authors of E. A. O’Brien

This figure shows the co-authorship network connecting the top 25 collaborators of E. A. O’Brien. A scholar is included among the top collaborators of E. A. O’Brien 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 E. A. O’Brien. E. A. O’Brien is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

Sort: Min cites: Since: Top N: Style:

20 of 20 papers shown

Eick, Bettina, Derek F. Holt, Gabriele Nebe, & E. A. O’Brien. (2022). Computational Group Theory. Oberwolfach Reports. 18(3). 2027–2087. 1 indexed citations

O’Brien, E. A., Ilia Ponomarenko, A. V. Vasil’ev, & E. P. Vdovin. (2021). The 3-closure of a solvable permutation group is solvable. Journal of Algebra. 607. 618–637. 3 indexed citations

O’Brien, E. A. & Christopher Voll. (2015). Enumerating classes and characters of 𝑝-groups. Transactions of the American Mathematical Society. 367(11). 7775–7796. 13 indexed citations

Dietrich, Heiko, C. R. Leedham-Green, Frank Lübeck, & E. A. O’Brien. (2013). Constructive recognition of classical groups in even characteristic. Journal of Algebra. 391. 227–255. 11 indexed citations

Flannery, Dane, et al.. (2013). Algorithms for linear groups of finite rank. Journal of Algebra. 393. 187–196. 3 indexed citations

Bray, John N., Marston Conder, C. R. Leedham-Green, & E. A. O’Brien. (2011). Short presentations for alternating and symmetric groups. Transactions of the American Mathematical Society. 363(6). 3277–3285. 5 indexed citations

O’Brien, E. A., et al.. (2011). Orbit invariants and an application to the Baby monster. Journal of Algebra. 341(1). 297–305. 8 indexed citations

Liebeck, Martin W., E. A. O’Brien, Aner Shalev, & Pham Huu Tiep. (2010). The Ore conjecture. Journal of the European Mathematical Society. 12(4). 939–1008. 60 indexed citations

Flannery, Dane, et al.. (2009). Deciding finiteness of matrix groups in positive characteristic. Journal of Algebra. 322(11). 4151–4160. 3 indexed citations

10.

Leedham-Green, C. R. & E. A. O’Brien. (2009). Constructive recognition of classical groups in odd characteristic. Journal of Algebra. 322(3). 833–881. 18 indexed citations

11.

Cavicchioli, Alberto, E. A. O’Brien, & Fulvia Spaggiari. (2008). On some questions about a family of cyclically presented groups. Journal of Algebra. 320(11). 4063–4072. 12 indexed citations

12.

Holt, Derek F. & E. A. O’Brien. (2006). A computer-assisted analysis of some matrix groups. Journal of Algebra. 300(1). 199–212. 2 indexed citations

13.

O’Brien, E. A.. (2005). GOBASE--a database of organelle and bacterial genome information. Nucleic Acids Research. 34(90001). D697–D699. 20 indexed citations

14.

Leedham-Green, C. R., et al.. (2005). Writing projective representations over subfields. Journal of Algebra. 295(1). 51–61. 20 indexed citations

15.

Linton, Stephen, et al.. (2004). Constructive membership testing in black-box groups. 64(2). e1–e33. 3 indexed citations

16.

Holt, Derek F., C. R. Leedham-Green, E. A. O’Brien, & Sarah Rees. (1996). Testing Matrix Groups for Primitivity. Journal of Algebra. 184(3). 795–817. 19 indexed citations

17.

Leedham-Green, C. R., et al.. (1995). Generating random elements of a finite group. Communications in Algebra. 23(13). 4931–4948. 100 indexed citations

18.

O’Brien, E. A., et al.. (1995). Selecting Base Points for the Schreier-Sims Algorithm for Matrix Groups. Journal of Symbolic Computation. 19(6). 577–584. 7 indexed citations

19.

Kramer, Earl S., Spyros S. Magliveras, & E. A. O’Brien. (1993). Some new large sets of t-designs.. Australas. J Comb.. 7. 189–194. 16 indexed citations

20.

O’Brien, E. A.. (1993). Isomorphism testing for p-groups. Journal of Symbolic Computation. 16(3). 305–320. 7 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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