Abstract
We investigate homomorphic images of the semiring of recursive functions as models of the Π2 fragment of Arithmetic, and some relations between this fragment, its models and recursion theory.
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Hirschfeld, J. Models of Arithmetic and recursive functions. Israel J. Math. 20, 111–126 (1975). https://doi.org/10.1007/BF02757881
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DOI: https://doi.org/10.1007/BF02757881