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Published online by Cambridge University Press: 24 October 2008
Notation. We consider an additive, right exact functor T(B, C) where B is a variable Λ-module, C a variable Γ-module and the values of T are in the category of Δ-modules. Here Λ, Γ, Δ are rings (which need not be commutative) each possessing an identity element.