August Ferdinand Möbius

August Ferdinand Möbius (Template:IPAc-en, Template:IPAc-en;<ref>Template:Cite LPD</ref> Template:IPA; 17 November 1790 – 26 September 1868) was a German mathematician and theoretical astronomer.

Life and education

Möbius was born in Schulpforta, Electorate of Saxony, and was descended on his mother's side from religious reformer Martin Luther.<ref>Template:Cite book</ref> He was home-schooled until he was 13, when he attended the college in Schulpforta in 1803, and studied there, graduating in 1809. He then enrolled at the University of Leipzig, where he studied astronomy under the mathematician and astronomer Karl Mollweide.<ref name="st-andrews1">Template:Cite book</ref> In 1813, he began to study astronomy under mathematician Carl Friedrich Gauss at the University of Göttingen, while Gauss was the director of the Göttingen Observatory. From there, he went to study with Carl Gauss's instructor, Johann Pfaff, at the University of Halle, where he completed his doctoral thesis The occultation of fixed stars in 1815.<ref name="st-andrews1"/> In 1816, he was appointed as Extraordinary Professor to the "chair of astronomy and higher mechanics" at the University of Leipzig.<ref name="st-andrews1"/> Möbius died in Leipzig in 1868 at the age of 77.

His son Theodor was a noted philologist.

Contributions

He is best known for his discovery of the Möbius strip, a non-orientable two-dimensional surface with only one side when embedded in three-dimensional Euclidean space. It was independently discovered by Johann Benedict Listing a few months earlier.<ref name="st-andrews1"/> The Möbius configuration, formed by two mutually inscribed tetrahedra, is also named after him. Möbius was the first to introduce homogeneous coordinates into projective geometry. He is recognized for the introduction of the barycentric coordinate system.<ref name=Hille>Hille, Einar. "Analytic Function Theory, Volume I", Second edition, fifth printing. Chelsea Publishing Company, New York, 1982, Template:ISBN, page 33, footnote 1</ref> Before 1853 and Schläfli's discovery of the 4-polytopes, Möbius (with Cayley and Grassmann) was one of only three other people who had also conceived of the possibility of geometry in more than three dimensions.<ref>Template:Cite book</ref>

Many mathematical concepts are named after him, including the Möbius plane, the Möbius transformations, important in projective geometry, and the Möbius transform of number theory. His interest in number theory led to the important Möbius function μ(n) and the Möbius inversion formula. In Euclidean geometry, he systematically developed the use of signed angles and line segments as a way of simplifying and unifying results.<ref>Howard Eves, A Survey of Geometry (1963), p. 64 (Revised edition 1972, Allyn & Bacon, Template:ISBN)</ref>

Collected works

• Gesammelte Werke erster Band (v. 1) (Leipzig : S. Hirzel, 1885)
• Gesammelte Werke zweiter Band (v. 2) (Leipzig : S. Hirzel, 1885)
• Gesammelte Werke dritter Band (v. 3) (Leipzig : S. Hirzel, 1885)
• Gesammelte Werke vierter Band (v. 4) (Leipzig : S. Hirzel, 1885)
• Die elemente der mechanik des himmels, auf neuem wege ohne hülfe höherer rechnungsarten dargestellt von August Ferdinand Möbius (Leipzig, Weidmann'sche buchhandlung, 1843)

• 1843 copy of Die Elemente der Mechanik des Himmels
  1843 copy of Die Elemente der Mechanik des Himmels
• Title page to a 1843 copy of Die Elemente der Mechanik des Himmels
  Title page to a 1843 copy of Die Elemente der Mechanik des Himmels
• First page to a 1843 copy of Die Elemente der Mechanik des Himmels
  First page to a 1843 copy of Die Elemente der Mechanik des Himmels

See also

• Barycentric coordinate system
• Collineation
• Homogeneous coordinates
• Möbius counter
• Möbius plane

External links

• Template:MacTutor Biography
• Template:MathGenealogy
• August Ferdinand Möbius - Œuvres complètes Gallica-Math
• A beautiful visualization of Möbius Transformations, created by mathematicians at the University of Minnesota is viewable at https://www.youtube.com/watch?v=JX3VmDgiFnY