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**How did you find PF?:**Google

I know how to express Hamiltonian for scalar field written in field operators through the raising and lowering momentum operators, but I can't figure out how to do the same for the number of particles written in field operators: the 1/2E coefficient within the corresponding integral, doesn't go away in the latter expression, as it does in the former one, and I cannot figure out how to deal with it. Any advise?