# Fame.am profile — machine-readable export
# Canonical URL: https://fame.am/person/peter-gustav-lejeune-dirichlet
# Generated: 2026-09-01T00:28:57.170Z

schema: https://schema.org/Person
url: "https://fame.am/person/peter-gustav-lejeune-dirichlet"
name: "Peter Gustav Lejeune Dirichlet"
slug: "peter-gustav-lejeune-dirichlet"
description: "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."
tagline: "German mathematician (1805–1859)"
image: "https://commons.wikimedia.org/wiki/Special:FilePath/Dirichlet.jpg"
gender: "male"
country:
  name: "Germany"
  isoCode: "DE"
category:
  name: "Academics"
  slug: "academics"
profileType:
  name: "Academic"
  slug: "academic"
  entityType: "https://www.wikidata.org/entity/Q39631"
birthDate: "1805-02-13"
deathDate: "1859-05-05"
livingStatus: "DECEASED"
scores:
  popularity:           57.79
  momentum:             0
  historical:           24.2673
  currentAttention:     0
  sourceConfidence:     60
  profileCompleteness:  70
  trendDirection:       "STABLE"
ranks:
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  country:  null
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tags:
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  - name: "Academic"
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  - name: "Mathematics"
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  - name: "Germany"
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  - name: "Europe"
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  - name: "19th Century"
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# bio (long form, separated for readability)
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.