# Peter Gustav Lejeune Dirichlet

> Dirichlet gave mathematics one of its most fundamental tools: the modern definition of a function. Before him, the concept was loose and intuitive; he made it rigorous, a move that quietly underpins every equation since.

*German mathematician (1805–1859)*

**Canonical URL:** https://fame.am/person/peter-gustav-lejeune-dirichlet

## Identity
- **Profile type:** Academic ([Wikidata](https://www.wikidata.org/entity/Q39631))
- **Category:** Academics
- **Country:** Germany
- **Born:** 1805-02-13
- **Died:** 1859-05-05
- **Status:** deceased
- **Gender:** male

## Bio

Born Johann Peter Gustav Lejeune Dirichlet on 13 February 1805 in Germany, he entered mathematics at a time when many of its core ideas still lacked formal structure. He proved special cases of Fermat's Last Theorem and in doing so created analytic number theory, a field that applies the tools of calculus to questions about whole numbers. He advanced Fourier series, the method of breaking complex waves into simple components, and was among the first to define a function in the precise way now taught in every textbook. His work ranged into mathematical physics—potential theory, boundary-value problems, heat diffusion, hydrodynamics—problems of motion and flow that required new rigor. He died on 5 May 1859, his surname a mouthful, his mononym attached to theorems still in use.

## Fame
- **Popularity score:** 57.8 / 100
- **Momentum:** 0.0 / 100  (trend: STABLE)
- **Historical depth:** 24.3 / 100
- **Now attention:** 0.0 / 100
- **Source confidence:** 60.0 / 100
- **Profile completeness:** 70.0 / 100

## Topics
#Scientists, #Academic, #Mathematics, #Germany, #Europe, #19th Century

## Sources
- [Wikidata](https://www.wikidata.org/wiki/Q29193)
- [Wikipedia](https://en.wikipedia.org/wiki/Peter_Gustav_Lejeune_Dirichlet)
- [Pantheon 2.0](https://pantheon.world/profile/person/Peter%20Gustav%20Lejeune%20Dirichlet)
- [Peter Gustav Lejeune Dirichlet](https://ast.wikipedia.org/wiki/Peter_Gustav_Lejeune_Dirichlet)
- [یوهان پتر قوستاف لوژون دیریکله](https://azb.wikipedia.org/wiki/%DB%8C%D9%88%D9%87%D8%A7%D9%86_%D9%BE%D8%AA%D8%B1_%D9%82%D9%88%D8%B3%D8%AA%D8%A7%D9%81_%D9%84%D9%88%DA%98%D9%88%D9%86_%D8%AF%DB%8C%D8%B1%DB%8C%DA%A9%D9%84%D9%87)
- [Peter Qustav Lejyon Dirixle](https://az.wikipedia.org/wiki/Peter_Qustav_Lejyon_Dirixle)
- [Іаган Петэр Густаў Лежон Дзірыхле](https://be.wikipedia.org/wiki/%D0%86%D0%B0%D0%B3%D0%B0%D0%BD_%D0%9F%D0%B5%D1%82%D1%8D%D1%80_%D0%93%D1%83%D1%81%D1%82%D0%B0%D1%9E_%D0%9B%D0%B5%D0%B6%D0%BE%D0%BD_%D0%94%D0%B7%D1%96%D1%80%D1%8B%D1%85%D0%BB%D0%B5)
- [Петер Густав Льожон Дирихле](https://bg.wikipedia.org/wiki/%D0%9F%D0%B5%D1%82%D0%B5%D1%80_%D0%93%D1%83%D1%81%D1%82%D0%B0%D0%B2_%D0%9B%D1%8C%D0%BE%D0%B6%D0%BE%D0%BD_%D0%94%D0%B8%D1%80%D0%B8%D1%85%D0%BB%D0%B5)
- [Johann Peter Gustav Lejeune Dirichlet](https://bs.wikipedia.org/wiki/Johann_Peter_Gustav_Lejeune_Dirichlet)
- [Johann Peter Gustav Lejeune Dirichlet](https://ca.wikipedia.org/wiki/Johann_Peter_Gustav_Lejeune_Dirichlet)
- [Johann Peter Gustav Lejeune Dirichlet](https://cs.wikipedia.org/wiki/Johann_Peter_Gustav_Lejeune_Dirichlet)
- [Johann Peter Gustav Lejeune Dirichlet](https://da.wikipedia.org/wiki/Johann_Peter_Gustav_Lejeune_Dirichlet)
- [Peter Gustav Lejeune Dirichlet](https://de.wikipedia.org/wiki/Peter_Gustav_Lejeune_Dirichlet)
- [Πέτερ Γκούσταφ Λεζέν Ντίριχλετ](https://el.wikipedia.org/wiki/%CE%A0%CE%AD%CF%84%CE%B5%CF%81_%CE%93%CE%BA%CE%BF%CF%8D%CF%83%CF%84%CE%B1%CF%86_%CE%9B%CE%B5%CE%B6%CE%AD%CE%BD_%CE%9D%CF%84%CE%AF%CF%81%CE%B9%CF%87%CE%BB%CE%B5%CF%84)
- [Johann Peter Gustav Lejeune Dirichlet](https://eo.wikipedia.org/wiki/Johann_Peter_Gustav_Lejeune_Dirichlet)
- [Peter Gustav Lejeune Dirichlet](https://es.wikipedia.org/wiki/Peter_Gustav_Lejeune_Dirichlet)
- [Peter Gustav Lejeune Dirichlet](https://eu.wikipedia.org/wiki/Peter_Gustav_Lejeune_Dirichlet)
- [یوهان پتر گوستاف لوژون دیریکله](https://fa.wikipedia.org/wiki/%DB%8C%D9%88%D9%87%D8%A7%D9%86_%D9%BE%D8%AA%D8%B1_%DA%AF%D9%88%D8%B3%D8%AA%D8%A7%D9%81_%D9%84%D9%88%DA%98%D9%88%D9%86_%D8%AF%DB%8C%D8%B1%DB%8C%DA%A9%D9%84%D9%87)
- [Johann Peter Gustav Lejeune Dirichlet](https://fi.wikipedia.org/wiki/Johann_Peter_Gustav_Lejeune_Dirichlet)
- [Johann Peter Gustav Lejeune Dirichlet](https://fr.wikipedia.org/wiki/Johann_Peter_Gustav_Lejeune_Dirichlet)
- [Peter Gustav Lejeune Dirichlet](https://gl.wikipedia.org/wiki/Peter_Gustav_Lejeune_Dirichlet)
- [יוהאן פטר גוסטב לז'ן דיריכלה](https://he.wikipedia.org/wiki/%D7%99%D7%95%D7%94%D7%90%D7%9F_%D7%A4%D7%98%D7%A8_%D7%92%D7%95%D7%A1%D7%98%D7%91_%D7%9C%D7%96'%D7%9F_%D7%93%D7%99%D7%A8%D7%99%D7%9B%D7%9C%D7%94)
- [पीटर गुस्ताफ लजन डीरिक्ले](https://hi.wikipedia.org/wiki/%E0%A4%AA%E0%A5%80%E0%A4%9F%E0%A4%B0_%E0%A4%97%E0%A5%81%E0%A4%B8%E0%A5%8D%E0%A4%A4%E0%A4%BE%E0%A4%AB_%E0%A4%B2%E0%A4%9C%E0%A4%A8_%E0%A4%A1%E0%A5%80%E0%A4%B0%E0%A4%BF%E0%A4%95%E0%A5%8D%E0%A4%B2%E0%A5%87)
- [Johann Peter Gustav Lejeune Dirichlet](https://hr.wikipedia.org/wiki/Johann_Peter_Gustav_Lejeune_Dirichlet)
- [Johann Peter Gustav Lejeune Dirichlet](https://ht.wikipedia.org/wiki/Johann_Peter_Gustav_Lejeune_Dirichlet)
- [Wikiquote](https://bg.wikiquote.org/wiki/%D0%9F%D0%B5%D1%82%D0%B5%D1%80_%D0%93%D1%83%D1%81%D1%82%D0%B0%D0%B2_%D0%9B%D1%8C%D0%BE%D0%B6%D0%BE%D0%BD_%D0%94%D0%B8%D1%80%D0%B8%D1%85%D0%BB%D0%B5)
- [Wikiquote](https://en.wikiquote.org/wiki/Peter_Gustav_Lejeune_Dirichlet)
- [Wikiquote](https://uk.wikiquote.org/wiki/%D0%99%D0%BE%D0%B3%D0%B0%D0%BD%D0%BD_%D0%9F%D0%B5%D1%82%D0%B5%D1%80_%D0%93%D1%83%D1%81%D1%82%D0%B0%D0%B2_%D0%9B%D0%B5%D0%B6%D0%B5%D0%BD-%D0%94%D1%96%D1%80%D1%96%D1%85%D0%BB%D0%B5)
- [بيتر غوستاف لوجون دركليه](https://ar.wikipedia.org/wiki/%D8%A8%D9%8A%D8%AA%D8%B1_%D8%BA%D9%88%D8%B3%D8%AA%D8%A7%D9%81_%D9%84%D9%88%D8%AC%D9%88%D9%86_%D8%AF%D8%B1%D9%83%D9%84%D9%8A%D9%87)
- [يوهان بيتر جوستاف لوجون دركليه](https://arz.wikipedia.org/wiki/%D9%8A%D9%88%D9%87%D8%A7%D9%86_%D8%A8%D9%8A%D8%AA%D8%B1_%D8%AC%D9%88%D8%B3%D8%AA%D8%A7%D9%81_%D9%84%D9%88%D8%AC%D9%88%D9%86_%D8%AF%D8%B1%D9%83%D9%84%D9%8A%D9%87)

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