if action is invariant under a translation x->x+a then there is a conserved current. I was wondering how should we know that if action is invariant for a particular translation in the first place. I know the only way which is when Lagrangian has some canonical variable absent, but this does not look very appealing to me for all the situations. Is there a more encompassing understanding.(adsbygoogle = window.adsbygoogle || []).push({});

kindly share your understanding.

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Conservation Law

**Physics Forums | Science Articles, Homework Help, Discussion**