Johann Peter Gustav Lejeune Dirichlet

Johann Peter Gustav Lejeune Dirichlet (February 13, 1805 - May 5, 1859) was a German mathematician credited with the modern "formal" definition of a function.

See also

• Dirichlet's theorem (number theory, 1835)
• Dirichlet characters (number theory, 1831)
• Dirichlet convolution (number theory)
• Dirichlet kernel (functional analysis, Fourier series)
• Dirichlet problem
• Dirichlet series
• Dirichlet tessellation
• Dirichlet boundary condition
• Dirichlet function
• Dirichlet distribution
• Pigeonhole principle
• Dirichlet brane (D-brane)