# Biography:Sophus Lie

__: Norwegian mathematician__

**Short description**Sophus Lie | |
---|---|

Lie in 1896 | |

Born | Marius Sophus Lie 17 December 1842 Nordfjordeid, Norway |

Died | 18 February 1899 Kristiania, Norway | (aged 56)

Nationality | Norwegian |

Alma mater | University of Christiania |

Known for | One-parameter group Differential invariant Contact transformation Infinitesimal transformation W-curve Carathéodory–Jacobi–Lie theorem Lie algebra Lie bracket Lie group Lie product formula Lie sphere geometry Lie theory Lie transform Lie's theorem Lie's third theorem Lie–Kolchin theorem See full list |

Awards | Lobachevsky Medal (1897) ForMemRS (1895) |

Scientific career | |

Fields | Mathematics |

Institutions | University of Christiania University of Leipzig |

Doctoral advisor | Carl Anton Bjerknes Cato Maximilian Guldberg |

Doctoral students | Hans Blichfeldt Lucjan Emil Böttcher Gerhard Kowalewski Kazimierz Żorawski Élie Cartan Elling Holst Edgar Odell Lovett |

**Marius Sophus Lie** (/liː/ *LEE*; Norwegian: [liː]; 17 December 1842 – 18 February 1899) was a *Norway* mathematician. He largely created the theory of continuous symmetry and applied it to the study of geometry and differential equations. He also made substantial contributions to the development of algebra.

## Life and career

Marius Sophus Lie was born on 17 December 1842 in the small town of Nordfjordeid. He was the youngest of six children born to Lutheran pastor Johann Herman Lie and his wife, who came from a well-known Trondheim family.^{[1]}

He had his primary education in the south-eastern coast of Moss, before attending high school in Oslo (known then as Christiania). After graduating from high school, his ambition towards a military career was dashed when the army rejected him due to poor eyesight. He then enrolled at the University of Christiania.

Sophus Lie's first mathematical work, *Repräsentation der Imaginären der Plangeometrie*, was published in 1869 by the Academy of Sciences in Christiania and also by *Crelle's Journal*. That same year he received a scholarship and travelled to Berlin, where he stayed from September to February 1870. There, he met Felix Klein and they became close friends. When he left Berlin, Lie travelled to Paris, where he was joined by Klein two months later. There, they met Camille Jordan and Gaston Darboux. But on 19 July 1870 the Franco-Prussian War began and Klein (who was Prussian) had to leave France very quickly. Lie left for Fontainebleau where he was arrested, suspected of being a German spy, garnering him fame in Norway. He was released from prison after a month, thanks to the intervention of Darboux.^{[2]}

Lie obtained his PhD at the University of Christiania (in present-day Oslo) in 1871 with a thesis entitled *Over en Classe geometriske Transformationer* (On a Class of Geometric Transformations).^{[3]} It would be described by Darboux as "one of the most handsome discoveries of modern Geometry". The next year, the Norwegian Parliament established an extraordinary professorship for him. That same year, Lie visited Klein, who was then at Erlangen and working on the Erlangen program.

In 1872, Lie spent eight years together with Peter Ludwig Mejdell Sylow, editing and publishing the mathematical works of their countryman, Niels Henrik Abel.

At the end of 1872, Sophus Lie proposed to Anna Birch, then eighteen years old, and they were married in 1874. The couple had three children: Marie (b. 1877), Dagny (b. 1880) and Herman (b. 1884).

From 1876, he co-edited the journal *Archiv for Mathematik og Naturvidenskab*, together with the physician Jacob Worm-Müller, and the biologist Georg Ossian Sars.

In 1884, Friedrich Engel arrived at Christiania to help him, with the support of Klein and Adolph Mayer (who were both professors at Leipzig by then). Engel would help Lie to write his most important treatise, *Theorie der Transformationsgruppen*, published in Leipzig in three volumes from 1888 to 1893. Decades later, Engel would also be one of the two editors of Lie's collected works.

In 1886, Lie became a professor at Leipzig, replacing Klein, who had moved to Göttingen. In November 1889, Lie suffered a mental breakdown and had to be hospitalized until June 1890. Subsequently he returned to his post, but over the years his anaemia progressed to the point where he returned to his homeland. In 1898 he tendered his resignation in May, and left for home in September the same year. He died the following year in 1899 at the age of 56, due to pernicious anemia, a disease caused by impaired absorption of vitamin B_{12}.

He was made Honorary Member of the London Mathematical Society in 1878, Corresponding Member of the French Academy of Sciences in 1892, Foreign Member of the Royal Society of London in 1895 and foreign associate of the National Academy of Sciences of the United States of America in 1895.

## Legacy

Lie's principal tool, and one of his greatest achievements, was the discovery that continuous transformation groups (now called, after him, Lie groups) could be better understood by "linearizing" them, and studying the corresponding generating vector fields (the so-called infinitesimal generators). The generators are subject to a linearized version of the group law, now called the commutator bracket, and have the structure of what is today called a Lie algebra.^{[4]}^{[5]}

Hermann Weyl used Lie's work on group theory in his papers from 1922 and 1923, and Lie groups today play a role in quantum mechanics.Cite error: Closing `</ref>`

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Lie advised many doctoral students who went on to become successful mathematicians. Élie Cartan became widely regarded as one of the greatest mathematicians of the 20th century. Kazimierz Żorawski's work was proved to be of importance to a variety of fields. Hans Frederick Blichfeldt made contributions to various fields of mathematics.

## Books

- Lie, Sophus (1888) (in de),
*Theorie der Transformationsgruppen I*, Leipzig: B. G. Teubner. Written with the help of Friedrich Engel. English translation available: Edited and translated from the German and with a foreword by Joël Merker, see ISBN 978-3-662-46210-2 and arXiv:1003.3202 - Lie, Sophus (1890) (in de),
*Theorie der Transformationsgruppen II*, Leipzig: B. G. Teubner. Written with the help of Friedrich Engel. - Lie, Sophus (1891) (in de),
*Vorlesungen über differentialgleichungen mit bekannten infinitesimalen transformationen*, Leipzig: B. G. Teubner. Written with the help of Georg Scheffers.^{[6]} - Lie, Sophus (1893) (in de),
*Vorlesungen über continuierliche Gruppen*, Leipzig: B. G. Teubner. Written with the help of Georg Scheffers.^{[7]} - Lie, Sophus (1893) (in de),
*Theorie der Transformationsgruppen III*, Leipzig: B. G. Teubner. Written with the help of Friedrich Engel. - Lie, Sophus (1896) (in de),
*Geometrie der Berührungstransformationen*, Leipzig: B. G. Teubner. Written with the help of Georg Scheffers.^{[8]} - Lie, Sophus, Engel, Friedrich; Heegaard, Poul, eds.,
*Gesammelte Abhandlungen*, Leipzig: Teubner, https://catalog.hathitrust.org/Record/005830809; 7 vols., 1922–1960^{[9]}^{[10]}

## See also

- Lie derivative
- List of simple Lie groups
- List of things named after Sophus Lie

## Notes

- ↑ James, Ioan (2002).
*Remarkable Mathematicians*. Cambridge University Press. p. 201. ISBN 978-0-521-52094-2. - ↑ Darboux, Gaston (1899). "Sophus Lie".
*Bull. Amer. Math. Soc.***5**(7): 367–370. doi:10.1090/s0002-9904-1899-00628-1. - ↑ Lie, Sophus (1871).
*Over en classe geometriske Transformationer*(PhD). University of Christiania. - ↑
Helgason, Sigurdur (1994), "Sophus Lie, the Mathematician",
*Proceedings of the Sophus Lie Memorial Conference, Oslo, August, 1992*, Oslo: Scandinavian University Press, pp. 3–21, http://ocw.mit.edu/courses/mathematics/18-755-introduction-to-lie-groups-fall-2004/readings/helga_sopmath3_2.pdf. - ↑ Cite error: Invalid
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- ↑ Lovett, E. O. (1898). "Review:
*Vorlesungen über Differentialgleichungen mit bekannten infinitesimalen Transformationen*".*Bull. Amer. Math. Soc.***4**(4): 155–167. doi:10.1090/s0002-9904-1898-00476-7. http://www.ams.org/journals/bull/1898-04-04/S0002-9904-1898-00476-7/. - ↑ Brooks, J. M. (1895). "Review:
*Vorlesungen über continuerliche Gruppen mit geometrischen und anderen Anwendungen*".*Bull. Amer. Math. Soc.***1**(10): 241–248. doi:10.1090/s0002-9904-1895-00283-9. http://www.ams.org/journals/bull/1895-01-10/S0002-9904-1895-00283-9/. - ↑ Lovett, E. O. (1897). "Review:
*Geometrie der Berührungstransformationen*".*Bull. Amer. Math. Soc.***3**(9): 321–350. doi:10.1090/s0002-9904-1897-00430-x. http://www.ams.org/journals/bull/1897-03-09/S0002-9904-1897-00430-X/. - ↑ Schilling, O. F. G. (1939). "Book Review: Sophus Lie's
*Gesammelte Abhandlungen. Geometrische Abhandlungen*, Volumes I & II".*Bulletin of the American Mathematical Society***45**(7): 513–514. doi:10.1090/S0002-9904-1939-07032-8. ISSN 0002-9904. - ↑ Carmichael, R. D. (1930). "Book Review: vol. IV of Sophus Lie's
*Gesammelte Abhandlungen*(*Samlede Avhandlinger*, Norwegian edition published by Aschehoug)".*Bulletin of the American Mathematical Society***36**(5): 337–338. doi:10.1090/S0002-9904-1930-04950-2. ISSN 0002-9904. (with links to 1923 review of Vol. III, 1925 review of Vol. V, & 1928 review of Vol. VI)

## References

- Fritzsche, Bernd (1999), "Sophus Lie: A Sketch of his Life and Work",
*Journal of Lie Theory***9**(1): 1–38, ISSN 0949-5932, http://www.emis.de/journals/JLT/vol.9_no.1/1.html, retrieved 2 December 2010 - Freudenthal, Hans (1970–1980), "Lie, Marius Sophus",
*Dictionary of Scientific Biography*, Charles Scribner's Sons, http://www.encyclopedia.com/people/science-and-technology/mathematics-biographies/marius-sophus-lie - Stubhaug, Arild (2002),
*The mathematician Sophus Lie: It was the audacity of my thinking*, Springer-Verlag, ISBN 3-540-42137-8, https://archive.org/details/mathematiciansop0000stub - Yaglom, Isaak Moiseevich (1988), Grant, Hardy; Shenitzer, Abe, eds.,
*Felix Klein and Sophus Lie: Evolution of the idea of symmetry in the nineteenth century*, Birkhäuser, ISBN 3-7643-3316-2

## External links

- O'Connor, John J.; Robertson, Edmund F. (February 2000), "Sophus Lie",
*MacTutor History of Mathematics archive*, University of St Andrews, http://www-history.mcs.st-andrews.ac.uk/Biographies/Lie.html. - Works by Sophus Lie at Project Gutenberg
- Error in Template:Internet Archive author: Sophus Lie doesn't exist.
- "The foundations of the theory of infinite continuous transformation groups – I" An English translation of a key paper by Lie (Part I)
- "The foundations of the theory of infinite continuous transformation groups – II" An English translation of a key paper by Lie (Part II)
- "On complexes – in particular, line and sphere complexes – with applications to the theory of partial differential equations" An English translation of a key paper by Lie
- "Foundations of an invariant theory of contact transformations" An English translation of a key paper by Lie
- "The infinitesimal contact transformations of mechanics" An English translation of a key paper by Lie
- U. Amaldi, "On the principal results obtained in the theory of continuous groups since the death of Sophus Lie (1898–1907)" English translation of a survey paper that followed his death

Original source: https://en.wikipedia.org/wiki/Sophus Lie.
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