Lagrangian (disambiguation)

Lagrangian may refer to:

• 💡

  Lagrangian (classical mechanics)

  A function L = T − V in classical mechanics that summarizes a system’s dynamics and yields equations of motion via the principle of least action.

• 💡

  Lagrangian (analytical mechanics)

  The general formalism of the Lagrangian approach to mechanics, often used for constraints and generalized coordinates.

• 💡

  Lagrangian (quantum field theory)

  A Lagrangian density that determines the dynamics of fields in quantum field theory via the action principle.