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Julius Petersen's paper, "Die Theorie der regularen graphs" in Acta Mathematica , volume 15 (1891), stands at the beginning of graph theory as we know it today. The Danish group of graph theorists decided in 1985 to mark the 150th birthday of Petersen in 1989, as well as the centennial of his paper. It was felt that the occasion called for a presentation of Petersen's famous paper in its historical context and, in a wider sense, of Petersen's life and work as a whole. However, the readily available information about Julius Petersen amounted to very little (not even a full bibliography existed) and virtually nothing was known about the circumstances that led him to write his famous paper. The study of Petersen's life and work has resulted in several papers, in particular a biography, a bibliography, an annotated edition of the letters surrounding Petersen's paper of 1891, an analysis of Petersen's paper and an annotated edition of parts of Petersen's correspondence with Sylow on Galois theory. The first four of these papers, together with a survey of matching theory, form the first part of this book.In addition to these five special papers, there are papers submitted in the celebration of the Petersen centennial. ... Read more

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Chapters: Anders Sandøe Ørsted, Johannes Schmidt, Julius Grøntved, Frederik Børgesen, Henning Eiler Petersen, Gunnar Thorson, C.g. Johannes Petersen, Lauritz Kolderup Rosenvinge, Anton Frederik Bruun. Source: Wikipedia. Pages: 31. Not illustrated. Free updates online. Purchase includes a free trial membership in the publisher's book club where you can select from more than a million books without charge. Excerpt: Anders Sandøe Ørsted, also written as Anders Sandoe Oersted or Anders Sandö Örsted (21 June 1816 - 3 September 1872) was a Danish botanist, mycologist, zoologist and marine biologist. He was nephew of the brothers physicist H.C. Ørsted and politician Anders Sandøe Ørsted. In his early career, he published on Danish and arctic nematodes and on the zonation of marine algae in the Sound. Between 1845 and 1848, he travelled extensively in Central America and the Caribbean and published numerous papers on the flora, concentrating on the plant families Acanthaceae and Fagaceae. One of his better known publications is L'Amérique Centrale. He was appointed professor of botany at the University of Copenhagen in 1851, a post he held until 1862. He was succeeded by Ferdinand Didrichsen. His studies of what has since been known as juniper-pear rust showed that this fungus annually switches between two hosts, Juniperus sabina is the primary (telial) host and pear Pyrus communis is the secondary (aecial) host. He thus was the first to discover that some plant-parasitic fungi are heteroecious. These studies were continued on other Gymnosporangium species The orchid genus Oerstedella Reichenbach f. is named for him. He is the author of several hundred plant names still in use. ...More: http://booksllc.net/?id=5342115 ... Read more

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Annual for the International Aroid Society (1993) ... Read more