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Published online by Cambridge University Press: 12 March 2014
Given a class U which is the result of closing a finite class of expressions with respect to a binary mode of combination, there exists, according to RFBL,1 a recursively enumerable subclass K* of U, and concepts of representation (5.3) and complete representation (6.2) such that:
(a) A relation among members of U is recursively enumerable if and only if it is represented in K*. (6.7.)
(b) A relation among members of U is recursive if and only if it is completely represented in K*. (6.10.)