The story
Named after German mathematician Peter Gustav Lejeune Dirichlet (1805–1859).
Etymology from Wiktionary, CC BY-SA 4.0.
Dirichlet series
Today it means: Any infinite series of the form ∑ₙ₌₁ ᪲(a_n)/(nˢ), where s and each a_n are complex numbers. Full definition →