| Invariant (physics) |
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functions of the dynamical variables) ''conserved'' (unchanged) during the time evolution of the physical system. The existence of invariants is often a consequence of some underlying Symmetry of the system. (See Noether's Theorem .) The correspondence between symmetries and conserved quantities is apparent through Conservation Laws . Much work has been done, especially in Quantum Physics , to relate every conserved quantity to some symmetry. One such quantity that still defies all such attempts is Mass . Some examples of invariance include:
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