Hi
Have been trying to solve the below question for a while, wondered if anyone could help.
Considering the action
$$S=\int -\frac{1}{2}\sum^2_{n,m=1} (\partial^{\mu}\phi_{nm}\partial_{\mu}\phi_{mn}+m^2 \phi_{nm} \phi_{mn})dx$$
under the transformation
$$\phi'=e^{\alpha}\phi e^{-\alpha}$$...