**Johann Peter Gustav Lejeune Dirichlet** (1805-1859) was a German mathematician who investigated the idea of Dirichlet series and proved *Dirichlet's Theorem on Primes in Arithmetic Progressions*, that for relatively prime positive integers $a$ and $k$, there are infinitely many primes of the form $a + kn$, where $n \in {\mathbb N}$.

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- Last edited by Alina Bucur on 2013-09-15 16:59:41

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- 2013-09-15 16:59:41 by Alina Bucur (Reviewed)