# A question on calculus of variations

1. Nov 2, 2013

### nenyan

1. The problem statement, all variables and given/known data

δ (∂x'^μ/∂x^β)=0

This equation is on my textbook. I don't quite understand. Where x'^μ is coordinate component.

2. Relevant equations

3. The attempt at a solution

2. Nov 2, 2013

### vanhees71

Is the transformation from $x$ to $x'$ given or what are your symbols supposed to mean?

3. Nov 2, 2013

### nenyan

Yes. It's the transformation from $x$ to $x'$.
δ is Variational symbol.

4. Nov 2, 2013

### vanhees71

Ok, you must define the meaning of $x'$ or give the complete variational problem. I don't know, what's meant by this symbol!