Source: J. Symbolic Logic Volume 73, Issue 4
(2008), 1122-1138.
In this article, we study some new characterizations of primitive recursive
functions based on restricted forms of primitive recursion, improving the
pioneering work of R. M. Robinson and M. D. Gladstone. We reduce
certain recursion schemes (mixed/pure iteration without parameters) and we
characterize one-argument primitive recursive functions as the closure under
substitution and iteration of certain optimal sets.
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