Julius Petersen
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Julius Peter Christian Petersen (June 16, 1839 - August 5, 1910) was a Danish mathematician.
He made early contributions to the field of graph theory. In 1892, he proposed a graph, known today as the "Petersen Graph".
He published a systematic treatment of geometrical constructions (with compasses and straightedge) in 1880. A French translation was reprinted in 1990.
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Template:Mathbiostubde:Julius Peter Christian Petersen zh:朱利叶斯·佩特森