Main Page | See live article | Alphabetical index Julius 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. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.