KnowraNoether's theoremLinked fromLinked fromThe 40 pages that link to Noether's theorem, each with the reason it gives.All 40Broader topic 1Related 32Narrower topic 4Compared with 3Conservation of angular momentumNarrower topic: Rotational symmetry explains why angular momentum is conserved in isolated systems.Lepton numberNarrower topic: Exact lepton-number conservation would follow from a corresponding continuous symmetry.Noether's second theoremNarrower topic: The second theorem is one half of this broader result on symmetry and variational equations.Ward–Takahashi identityNarrower topic: The identity is the quantum-field-theory expression of the conservation law associated with a continuous symmetry.