 Émile Léonard Mathieu

Émile Léonard Mathieu (1835–1890) was a French mathematician known for his contributions to various areas of mathematics, particularly in the field of differential equations and algebraic geometry. He is well-known for developing the theory of Mathieu functions, which are special functions that arise in problems of mathematical physics, particularly in the study of elliptic functions and various types of differential equations. Mathieu functions are often used in applications involving periodic potentials, such as in quantum mechanics and wave phenomena.