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praharmitra

- 311

- 1

**Proof of something...**

I posted this in the calculus section...but no reply... I came across this while studying the most general noether's theorem which I will later apply to quantum field theory. So I am posting this here, hoping that some one would have come across this while studying qft

I was learning noether's theorem and I came up with something that I can't seem to prove.

Prove -

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

I was trying to prove the more general expression

[tex] d (\delta f) = \delta (d f)[/tex]

where f( x, y, z, t, ...) is a function of n variables.

If i could prove the first then the second is proved...any help?