Abstract
The problem of commutation relations between different fields is analysed on the basis of the postulate that local interaction Hamiltonians lead to local field equations. It is shown that besides the normal case (anticommutativity of different Fermi fields, commutativity of all other fields), there can be other solutions. All these solutions are generated from the normal case by a sequence of transformations of field operators, of a type first studied by Klein. The TCP theorem holds in all these cases if it holds in the normal case.

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