Lagrangian

Lagrangian may refer to:

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 density

Physics

 * Lagrangian (physics), a function in Lagrangian 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 system