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## Homework Statement

As it says in the pdf: "Based on Noether's theorem construct the energy-momentum tensor for classical electromagnetism from the above Lagrangian. [itex]L=-1/4 F^{μν} F_{μν}[/itex] where [itex]F_{μν}=∂_μA_ν-∂_νA_μ [/itex]

I'm stuck at equation (11): [itex] \frac{δL}{δ(∂_μA_λ)}=-F^{μν} [/itex].

Could someone help me understand how they get this result?

## Homework Equations

Some tensor product rule maybe?

## The Attempt at a Solution

I would get the result if I use the usual product rule. But how do I treat the indices?

Any tips or redirects to where I can read about it is very appreciated :)

Kind regards

Alex