Adrien-Marie Legendre (1752–1833) is the eponym of all of the things listed below.
26950 Legendre Associated Legendre polynomials Fourier–Legendre series Gauss–Legendre algorithm Gauss–Legendre method Gauss–Legendre quadrature Legendre (crater) Legendre chi function Legendre duplication formula Legendre–Papoulis filter Legendre form Legendre function Legendre moment Legendre polynomials Legendre pseudospectral method Legendre rational functions Legendre relation Legendre sieve Legendre symbol Legendre transformation Legendre transform (integral transform) Finite Legendre transform Legendre wavelet Legendre–Clebsch condition Legendre–Fenchel transformation Legendre's conjecture Legendre's constant Legendre's differential equation Legendre's equation Legendre's formula Legendrian knot Legendrian submanifold Saccheri–Legendre theorem Legendre's theorem on spherical triangles Legendre's three-square theorem Gamma function–Legendre formula
