How can I work out(adsbygoogle = window.adsbygoogle || []).push({});

{π,∂φ}

where {,} is a Poisson Bracket; π is the canonical momentum and ∂φ is the spacial derivative of the field (ie. not including the temporal one).

Basically the question boils down to (or atleast I think it does!), working out ∂(∂φ) /∂φ - ie. differentiating the spacial derivative ∂φ wrt φ.

Stupid question - but how to do this?

Thanks

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# Poisson bracket

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