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NETS OF SUBFACTORS
A subtheory of a quantum field theory specifies von Neumann subalgebras [Formula: see text] (the āobservablesā in the space-time region [Formula: see text]) of the von Neumann algebras [Formula: see text] (the 'field' localized in [Formula: see text]). Every local algebra being a (type III 1 ) factor, the inclusion ā¦