Hyper-Torre isols

Journal of Symbolic Logic 46 (1):1-5 (1981)
If T is an isol let D(T) be the least set of isols which contains T and is closed under predecessors and the application of almost recursive combinatorial functions. We find an infinite regressive isol T such that the universal theory (with respect to recursive relations and almost recursive combinatorial functions) of D(T) is the same as that of the nonnegative integers
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DOI 10.2307/2273250
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