Recursively enumerable sets and degrees
Recursively enumerable sets and degrees
Index sets in computable analysis
Theoretical Computer Science - Special issue on computability and complexity in analysis
Logic programming with infinite sets
Annals of Mathematics and Artificial Intelligence
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We study the complexity of computable and Σ$_{\rm 1}^{\rm 0}$ inductive definitions of sets of natural numbers. For we example, we show how to assign natural indices to monotone Σ$_{\rm 1}^{\rm 0}$-definitions and we use these to calculate the complexity of the set of all indices of monotone Σ$_{\rm 1}^{\rm 0}$-definitions which are computable. We also examine the complexity of new type of inductive definition which we call weakly finitary monotone inductive definitions. Applications are given in proof theory and in logic programming.