@misc{Seda_N._Manukian_On,
author={Seda N. Manukian},
howpublished={online},
publisher={НАН РА},
abstract={The notions of positive and strongly positive arithmetical set are considered in ([1]-[3] ). It is noted in [3] that the transitive closure of any 2-dimensional strongly positive set is primitive recursive. In this article a more strong statement is proved: the transitive closure of any 2-dimensional strongly positive set is defined by an arithmetical formula in the signature (0,=, < ,S), where S(x)=x+1.},
type={Article},
title={On Transitive Closures of Two-dimensional Strongly Positive Arithmetical Sets},
keywords={Elementary mathematics; Arithmetic, Mathematics, Algorithm},
}