Carsten Thomassen (born August 22, 1948 in

Grindsted Grindsted, with a population of 9,750 (1 January 2022),BY3: ...

) is a

Danish Danish may refer to: * Something of, from, or related to the country of Denmark People * A national or citizen of Denmark, also called a "Dane," see Demographics of Denmark * Culture of Denmark * Danish people or Danes, people with a Danish ance ...

mathematician A mathematician is someone who uses an extensive knowledge of mathematics in their work, typically to solve mathematical problems. Mathematicians are concerned with numbers, data, quantity, mathematical structure, structure, space, Mathematica ...

. He has been a Professor of Mathematics at the

Technical University of Denmark The Technical University of Denmark ( da, Danmarks Tekniske Universitet), often simply referred to as DTU, is a polytechnic university and school of engineering. It was founded in 1829 at the initiative of Hans Christian Ørsted as Denmark's fir ...

since 1981, and since 1990 a member of the

Royal Danish Academy of Sciences and Letters {{Infobox organization , name = The Royal Danish Academy of Sciences and Letters , full_name = , native_name = Det Kongelige Danske Videnskabernes Selskab , native_name_lang = , logo = Royal ...

. His research concerns

discrete mathematics Discrete mathematics is the study of mathematical structures that can be considered "discrete" (in a way analogous to discrete variables, having a bijection with the set of natural numbers) rather than "continuous" (analogously to continu ...

and more specifically graph theory. Thomassen received his

Ph.D. A Doctor of Philosophy (PhD, Ph.D., or DPhil; Latin: or ') is the most common degree at the highest academic level awarded following a course of study. PhDs are awarded for programs across the whole breadth of academic fields. Because it is a ...

in 1976 from the

University of Waterloo The University of Waterloo (UWaterloo, UW, or Waterloo) is a public research university with a main campus in Waterloo, Ontario, Canada. The main campus is on of land adjacent to "Uptown" Waterloo and Waterloo Park. The university also operates ...

. He is editor-in-chief of the ''

Journal of Graph Theory The ''Journal of Graph Theory'' is a peer-reviewed mathematics journal specializing in graph theory and related areas, such as structural results about graphs, graph algorithms with theoretical emphasis, and discrete optimization on graphs. Th ...

'' and the ''

Electronic Journal of Combinatorics The ''Electronic Journal of Combinatorics'' is a peer-reviewed open access scientific journal covering research in combinatorial mathematics. The journal was established in 1994 by Herbert Wilf (University of Pennsylvania) and Neil Calkin (Georg ...

'', and editor of ''

Combinatorica ''Combinatorica'' is an international journal of mathematics, publishing papers in the fields of combinatorics and computer science. It started in 1981, with László Babai and László Lovász as the editors-in-chief with Paul Erdős as hono ...

'', the ''

Journal of Combinatorial Theory The ''Journal of Combinatorial Theory'', Series A and Series B, are mathematical journals specializing in combinatorics and related areas. They are published by Elsevier. ''Series A'' is concerned primarily with structures, designs, and applicat ...

'' Series B,

Discrete Mathematics Discrete mathematics is the study of mathematical structures that can be considered "discrete" (in a way analogous to discrete variables, having a bijection with the set of natural numbers) rather than "continuous" (analogously to continu ...

, and the ''

European Journal of Combinatorics European, or Europeans, or Europeneans, may refer to: In general * ''European'', an adjective referring to something of, from, or related to Europe ** Ethnic groups in Europe ** Demographics of Europe ** European cuisine European cuisine co ...

''. He was awarded the Dedicatory Award of the 6th International Conference on the Theory and Applications of Graphs by the

Western Michigan University Western Michigan University (Western Michigan, Western or WMU) is a Public university, public research university in Kalamazoo, Michigan. It was initially established as Western State Normal School in 1903 by Governor Aaron T. Bliss for the tr ...

in May 1988, the

Lester R. Ford Award Lester is an ancient Anglo-Saxon surname and given name. Notable people and characters with the name include: People Given name * Lester Bangs (1948–1982), American music critic * Lester W. Bentley (1908–1972), American artist from Wisco ...

by the Mathematical Association of America in 1993, and the Faculty of Mathematics Alumni Achievement Medal by the University of Waterloo in 2005. In 1990 he was an invited speaker (''Graphs, random walks and electric networks'') at the

ICM ICM may refer to: Organizations * Irish Church Missions * Institut du cerveau et de la moelle épinière, a research center * Interdisciplinary Centre for Mathematical and Computational Modelling, University of Warsaw * International Confederatio ...

Kyōto Kyoto (; Japanese: , ''Kyōto'' ), officially , is the capital city of Kyoto Prefecture in Japan. Located in the Kansai region on the island of Honshu, Kyoto forms a part of the Keihanshin metropolitan area along with Osaka and Kobe. , the ...

. He was included on the ISI Web of Knowledge list of the 250 most cited mathematicians.

Selected works

*with Bojan Mohar: ''Graphs on surfaces'', Johns Hopkins University Press 2001 *5-choosability of planar graphs (see

List coloring In graph theory, a branch of mathematics, list coloring is a type of graph coloring where each vertex can be restricted to a list of allowed colors. It was first studied in the 1970s in independent papers by Vizing and by Erdős, Rubin, and Tayl ...

) *works on

Hypohamiltonian graph In the mathematical field of graph theory, a graph ''G'' is said to be hypohamiltonian if ''G'' itself does not have a Hamiltonian cycle but every graph formed by removing a single vertex from ''G'' is Hamiltonian. History Hypohamiltonian graphs ...

s *Hamilton connectivity of Tournaments (see

Tournament (graph theory) A tournament is a directed graph (digraph) obtained by assigning a direction for each edge in an undirected complete graph. That is, it is an orientation of a complete graph, or equivalently a directed graph in which every pair of distinct verti ...

) and of 4-connected planar graphs *his proof of

Gr%C3%B6tzsch%27s theorem In the mathematical field of graph theory, Grötzsch's theorem is the statement that every triangle-free planar graph can be colored with only three colors. According to the four-color theorem, every graph that can be drawn in the plane without e ...

References

{{DEFAULTSORT:Thomassen, Carsten 1948 births Living people People from Billund Municipality 20th-century Danish mathematicians Graph theorists University of Waterloo alumni

Selected works

See also

References