# August Ferdinand Möbius

**August Ferdinand Möbius** (UK: /ˈmɜːbiəs/, US: /ˈmeɪ-, ˈmoʊ-/;^{[1]} German: [ˈmøːbi̯ʊs]; 17 November 1790 – 26 September 1868) was a German mathematician and theoretical astronomer.

August Möbius | |
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August Ferdinand Möbius (1790–1868) | |

Born | August Ferdinand Möbius 17 November 1790 |

Died | 26 September 1868 | (aged 77)

Nationality | Saxon |

Alma mater | University of Leipzig University of Göttingen University of Halle |

Known for | Möbius strip Möbius transformations Möbius transform Möbius function Möbius inversion formula Möbius–Kantor configuration Möbius–Kantor graph |

Scientific career | |

Fields | Mathematician |

Institutions | University of Leipzig |

Doctoral advisor | Johann Pfaff |

Other academic advisors | Carl Friedrich Gauss Karl Mollweide |

Doctoral students | Otto Wilhelm Fiedler |

Other notable students | Hermann Hankel |

## Early life and educationEdit

Möbius was born in Schulpforta, Saxony-Anhalt, and was descended on his mother's side from religious reformer Martin Luther.^{[2]} 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.^{[3]} In 1813, he began to study astronomy under the mathematically inclined professor 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.^{[3]} In 1816, he was appointed as Extraordinary Professor to the "chair of astronomy and higher mechanics" at the University of Leipzig.^{[3]} Möbius died in Leipzig in 1868 at the age of 77. His son Theodor was a noted philologist.

## ContributionsEdit

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.^{[3]} 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.^{[4]}

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.^{[5]}

## Collected worksEdit

- 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)

## See alsoEdit

## ReferencesEdit

**^**Wells, John C. (2008).*Longman Pronunciation Dictionary*(3rd ed.). Longman. ISBN 978-1-4058-8118-0.**^**George Szpiro (2007).*Poincaré's Prize: The Hundred-Year Quest to Solve One of Math's Greatest Puzzles*. Plume. p. 66. ISBN 978-0-525-95024-0.- ^
^{a}^{b}^{c}^{d}August Ferdinand Möbius, The MacTutor History of Mathematics archive. History.mcs.st-andrews.ac.uk. Retrieved on 2017-04-26. **^**Hille, Einar. "Analytic Function Theory, Volume I", Second edition, fifth printing. Chelsea Publishing Company, New York, 1982, ISBN 0-8284-0269-8, page 33, footnote 1**^**Howard Eves, A Survey of Geometry (1963), p. 64 (Revised edition 1972, Allyn & Bacon, ISBN 0-205-03226-5)

## External linksEdit

Wikimedia Commons has media related to .August Ferdinand Möbius |

Wikisource has the text of a 1920 Encyclopedia Americana article about .August Ferdinand Möbius |

Wikisource has the text of the 1911 Encyclopædia Britannica article .Möbius, August Ferdinand |

- O'Connor, John J.; Robertson, Edmund F., "August Ferdinand Möbius",
*MacTutor History of Mathematics archive*, University of St Andrews. - August Ferdinand Möbius at the Mathematics Genealogy Project
- 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