Julius Peter Christian Petersen (June 16, 1839, Sorø on Zealand – August 5, 1910) was a Danish mathematician. Events 1487 - Battle of Stoke Field, the last dying breath of the Wars of the Roses. Year 1839 ( MDCCCXXXIX) was a Common year starting on Tuesday (link will display the full calendar of the Gregorian Calendar (or a Common Sorø is a Town in Sorø municipality in Region Sjælland on the island of Zealand ( Sjælland) in east Denmark. Zealand (also Sealand Danish: Sjælland;) is the largest Island (7031 km² of Denmark (excluding Greenland Events 642 - Battle of Maserfield - Penda of Mercia defeats and kills Oswald of Bernicia. Year 1910 ( MCMX) was a Common year starting on Saturday (link will display calendar of the Gregorian calendar (or a Common year starting The Kingdom of Denmark ( ˈd̥ænmɑɡ̊ (archaic ˈd̥anmɑːɡ̊ commonly known as Denmark, is a country in the Scandinavian region of northern Europe A mathematician is a person whose primary area of study and research is the field of Mathematics.
Petersen's interests in mathematics were manifold (geometry, function theory, number theory, mathematical physics, mathematical economics, cryptography and graph theory). Geometry ( Greek γεωμετρία; geo = earth metria = measure is a part of Mathematics concerned with questions of size shape and relative position Complex analysis, traditionally known as the theory of functions of a complex variable, is the branch of Mathematics investigating functions of Complex Number theory is the branch of Pure mathematics concerned with the properties of Numbers in general and Integers in particular as well as the wider classes Mathematical physics is the scientific discipline concerned with the interface of Mathematics and Physics. Mathematical economics refers to the application of Mathematical methods to represent economic theories and analyze problems posed in Economics. Cryptography (or cryptology; from Greek grc κρυπτός kryptos, "hidden secret" and grc γράφω gráphō, "I write" In Mathematics and Computer science, graph theory is the study of graphs: mathematical structures used to model pairwise relations between objects His famous paper [1] originated the graph theory as we know it today. In 1898, he gives his famous counterexample to Tait's theorem about 1-factorability of 3-regular graphs, the "Petersen Graph". Year 1898 ( MDCCCXCVIII) was a Common year starting on Saturday (link will display the full calendar of the Gregorian calendar (or a Common Peter Guthrie Tait ( April 28, 1831 - July 4, 1901) was a Scottish mathematical physicist, best known for the seminal energy In Graph theory, the Petersen graph is an Undirected graph with 10 vertices and 15 edges
He published a systematic treatment of geometrical constructions (with straightedge and compass) in 1880. Geometry ( Greek γεωμετρία; geo = earth metria = measure is a part of Mathematics concerned with questions of size shape and relative position Pentagon constructgif|thumb|right|Construction of a regular pentagon]] Compass-and-straightedge or ruler-and-compass construction is the construction of lengths or Angles Year 1880 ( MDCCCLXXX) was a Leap year starting on Thursday (link will display the full calendar of the Gregorian calendar (or a Leap year A French translation was reprinted in 1990. French ( français,) is a Romance language spoken around the world by 118 million people as a native language and by about 180 to 260 million people Year 1990 ( MCMXC) was a Common year starting on Monday (link displays the 1990 Gregorian calendar)
A special issue of Discrete Mathematics has been dedicated to the 150th birthday of Petersen, in which a very precise biography may be found [2].
References
- ^ Petersen, J. (1891). "Die Theorie der regulären graphs". Acta Mathematica 15: 193. doi:. A digital object identifier ( DOI) is a permanent identifier given to an Electronic document.
- ^ Lützen, J. ; Sabidussi, G. and Toft, B. (1992). "Julius Petersen 1839–1910 a biography". Discrete Mathematics 100, Issues 1-3: 9–82. doi:. A digital object identifier ( DOI) is a permanent identifier given to an Electronic document.
External links
- O'Connor, John J. & Robertson, Edmund F. , “Julius Petersen”, MacTutor History of Mathematics archive
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