📜 Theorem, law or theory

Dirichlet's theorem on arithmetic progressions

Teorema de Dirichlet sobre progresiones aritméticas

Date
1837 · confidence high
Place
Berlin, Germany
Credited to
Johann Peter Gustav Lejeune Dirichlet
Field
Knowledge & symbols

What was discovered

A number-theory theorem proving that every arithmetic progression a+nd, with a and d coprime, contains infinitely many primes. It extends Euclid's theorem on the infinitude of primes and was the first use of analysis (L-functions) in number theory.

Proved by Dirichlet in 1837 using L-functions, a pioneering analytic technique in number theory.

What it led to

  • the birth of analytic number theory (Dirichlet L-functions)
  • later results on the distribution of primes in progressions
  • a conceptual extension of Euclid's theorem on infinite primes

Links

Sources✓ verified 2026-09-28