The action of a path is the time integral of its Lagrangian. The principle of stationary action requires its first variation to vanish for every admissible fixed-endpoint variation.
The principle of stationary action says that the physical path between fixed endpoints is a stationary point of the action.
Ancestors (5)
Incoming links (76)
- Classical-path factorization of a quadratic path integral
- Derivative-antighost gauge-fixing fermion
- Dirac spinor pseudo-unitarity
- Energy balance for an autonomous Lagrangian
- Gaussian fluctuation approximation
- Harmonic oscillator transition kernel
- Internal symmetry of a classical field theory
- Lagrangian density
- Mukhanov-Sasaki variable
- One-particle-irreducible vertex
- Operator-path-integral equivalence
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- Phase-space action
- Principle of stationary action
- Proca time-ordering contact term
- Scalar field theory
- Sine-Gordon theory
- Variational symmetry of a Lagrangian density
- Worldline einbein
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