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How can I work out
{π,∂φ}
where {,} is a Poisson Bracket; π is the canonical momentum and ∂φ is the spatial 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 spatial derivative ∂φ wrt φ.
Stupid question - but how to do this?
Thanks
{π,∂φ}
where {,} is a Poisson Bracket; π is the canonical momentum and ∂φ is the spatial 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 spatial derivative ∂φ wrt φ.
Stupid question - but how to do this?
Thanks