- Julius Petersen
Julius Peter Christian Petersen (
June 16 ,1839 ,Sorø onZealand –August 5 ,1910 ) was a Danishmathematician .Petersen's interests in mathematics were manifold (
geometry ,function theory ,number theory ,mathematical physics ,mathematical economics ,cryptography andgraph theory ).His famous paper cite journal|author=Petersen, J.|title=Die Theorie der regulären graphs|journal=Acta Mathematica|volume=15|year=1891 | pages = 193 | doi = 10.1007/BF02392606] 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 ".He published a systematic treatment of geometrical constructions (with
straightedge and compass ) in 1880. A French translation was reprinted in 1990.A special issue of Discrete Mathematics has been dedicated to the 150th birthday of Petersen, in which a very precise biography may be found cite journal|author=Lützen, J.; Sabidussi, G. and Toft, B.|title=Julius Petersen 1839–1910 a biography|volume=100, Issues 1-3|year=1992|pages=9–82|doi=10.1016/0012-365X(92)90636-T | journal = Discrete Mathematics] .
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