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Noether Theorem
Definition 
In 1915, Emmy Noether discovered a fundamental relationship between symmetries and conservations in physics. Whenever a system is invariant under changes in a particular variable, there is a corresponding conservation of another associated variable.
Particularly notable are the symmetries in:
• Time (conservation of energy),
• Translation (conservation of momentum), and
• Rotation (conservation of angular momentum).
ID:(59, 0)