Every text book i find breezes over the following point:(adsbygoogle = window.adsbygoogle || []).push({});

[tex]\delta[/tex][tex]\partial[/tex] (x) =[tex]\partial[/tex] [tex]\delta[/tex] (x)

where delta is just the variation. Someone asked me why thats true and i guessed the only thing i could say was that delta is an operation not a variable so this is more like an algebraric statment of the commutivity of delta and taking a derivative. Is this right or is there a more clear explanation.

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

Dismiss Notice

Join Physics Forums Today!

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

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

# Derivations of Euler equations

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