Some Decidability and Definability Problems for the Predicate of the Divisibility on Two Consecutive Numbers

  • Михаил Романович Старчак Saint Petersburg State University, Saint Petersburg, Russia


The predicate of divisibility on two consecutive numbers DW(x,y) ÷ x | y ∧ 1+x | y was introduced by L. van den Dries and A. Wilkie when they studied some properties of subsets of natural numbers, existentially definable with unit, addition and divisibility. Undecidability of the existential theory of natural numbers with multiplication and DW and definability of addition and multiplication in terms of DWand divisibility is proved in the paper. Then the definability of multiplication in the terms of addition and DW is proved. Some definability questions for order and DW are also considered in the paper.

Author Biography

Михаил Романович Старчак, Saint Petersburg State University, Saint Petersburg, Russia

Mikhail R. Starchak, postgraduate student, department of informatics SPbSU, 199034 Saint Petersburg, University emb., 7/9,


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How to Cite
СТАРЧАК, Михаил Романович. Some Decidability and Definability Problems for the Predicate of the Divisibility on Two Consecutive Numbers. Computer Tools in Education, [S.l.], n. 6, p. 5-15, dec. 2018. ISSN 2071-2359. Available at: <>. Date accessed: 22 july 2019. doi:
Computer science