Julius Peter Christian Petersen

Julius Petersen (* 6. June 1839 in Sorø; † 5. August 1910 in Copenhagen) was a Danish mathematician.

It was one of the first mathematicians, who concerned themselves with the graph theory. 1892 indicated a graph , which admits today as Peter EN graph is to Petersen. 1880 published Petersen a paper over geometrical constructions with circle and ruler (see also classical problems of antique mathematics), which appeared again 1990 as French translation.

Petersen wrote a set of text books for pupils and students.

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