- #1
rwooduk
- 762
- 59
Homework Statement
Homework Equations
Relabelling of indeces, 4-vector notation
The Attempt at a Solution
The forth line where I've circled one of the components in red, I am unsure why you can simply let ν=μ and μ=v for the second part of the line only then relate it to the first part and add them. If you are chosing "dummy indices" as suggested in the image then wouldn't they have to be independant of the first parts indices?
I'm unsure of what is going on here, any ideas would be really helpful, thanks.