Ortrud Oellermann | |
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Born | Vryheid |
Awards | Silver British Association Medal Meiring Naude Medal, Hall Medal |
Academic background | |
Alma mater | University of Natal, Western Michigan University |
Thesis | Generalized Connectivity in Graphs |
Doctoral advisor | Gary Chartrand |
Academic work | |
Discipline | Mathematics |
Sub-discipline | graph theory |
Institutions | University of Durban-Westville, Western Michigan University, University of Natal, Brandon University, University of Winnipeg |
Notable works | Applied and Algorithmic Graph Theory |
Ortrud R. Oellermann is a South African mathematician specializing in graph theory. She is a professor of mathematics at the University of Winnipeg.
Oellermann was born in Vryheid.[1] She earned a bachelor's degree, cum laude honours, and a master's degree at the University of Natal in 1981, 1982, and 1983 respectively,[2] as a student of Henda Swart.[3] She completed her Ph.D. in 1986 at Western Michigan University. Her dissertation was Generalized Connectivity in Graphs and was supervised by Gary Chartrand.[2][4]
Oellermann taught at the University of Durban-Westville, Western Michigan University, University of Natal, and Brandon University, before moving to Winnipeg in 1996. At Winnipeg, she was co-chair of mathematics and statistics for 2011–2013.[2]
With Gary Chartrand, Oellermann is the author of the book Applied and Algorithmic Graph Theory (McGraw Hill, 1993).[AA]
She is also the author of well-cited research publications on metric dimension of graphs[MD], on distance-based notions of convex hulls in graphs,[CS] and on highly irregular graphs in which every vertex has a neighborhood in which all degrees are distinct.[IG] The phrase "highly irregular" was a catchphrase of her co-author Yousef Alavi; because of this, Ronald Graham suggested that there should be a concept of highly irregular graphs, by analogy to the regular graphs, and Oellermann came up with the definition of these graphs.[5]
In 1991, Oellermann was the winner of the annual Silver British Association Medal of the Southern Africa Association for the Advancement of Science.[6] She won the Meiring Naude Medal of the Royal Society of South Africa in 1994.[7] She was also one of three winners of the Hall Medal of the Institute of Combinatorics and its Applications in 1994, the first year the medal was awarded.[8]
AA. | Chartrand, Gary; Oellermann, Ortrud R. (1993), Applied and Algorithmic Graph Theory, International Series in Pure and Applied Mathematics, New York: McGraw-Hill, Inc., ISBN 0-07-557101-3, MR 1211413
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IG. | Alavi, Yousef; Chartrand, Gary; Chung, F. R. K.; Erdős, Paul; Graham, R. L.; Oellermann, Ortrud R. (1987), "Highly irregular graphs", Journal of Graph Theory, 11 (2): 235–249, doi:10.1002/jgt.3190110214, MR 0889356
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MD. | Chartrand, Gary; Eroh, Linda; Johnson, Mark A.; Oellermann, Ortrud R. (2000), "Resolvability in graphs and the metric dimension of a graph" (PDF), Discrete Applied Mathematics, 105 (1–3): 99–113, doi:10.1016/S0166-218X(00)00198-0, MR 1780464
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CS. | Cáceres, José; Márquez, Alberto; Oellermann, Ortrud R.; Luz Puertas, María (2005), "Rebuilding convex sets in graphs", Discrete Mathematics, 297 (1–3): 26–37, doi:10.1016/j.disc.2005.03.020, hdl:11441/34391, MR 2159429
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