Mathematics
* Lagrangian function, used to solve constrained minimization problems in optimization theory; see Lagrange multiplier ** Lagrangian relaxation, the method of approximating a difficult constrained problem with an easier problem having an enlarged feasible set ** Lagrangian dual problem, the problem of maximizing the value of the Lagrangian function, in terms of the Lagrange-multiplier variable; See Dual problem * Lagrangian, a functional whose extrema are to be determined in the calculus of variations * Lagrangian submanifold, a class of submanifolds in symplectic geometry * Lagrangian system, a pair consisting of a smooth fiber bundle and a Lagrangian densityPhysics
* Lagrangian mechanics, a formulation of classical mechanics * Lagrangian (field theory), a formalism in classical field theory * Lagrangian point, a position in an orbital configuration of two large bodies * Lagrangian coordinates, a way of describing the motions of particles of a solid or fluid in continuum mechanics * Lagrangian coherent structure, distinguished surfaces of trajectories in a dynamical systemSee also
* Joseph-Louis Lagrange (1736–1813), Italian mathematician and astronomer * Lagrange (disambiguation) * List of things named after Joseph-Louis Lagrange {{Disambiguation, maths