2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/104399This paper treats logic programming with three kinds of negation: default, weak and strict negations. A 3-valued logic model theory is discussed for logic programs with three kinds of negation. The procedure is constructed for negations so that a soundness of the procedure is guaranteed in terms of 3-valued logic model theory.14 pages, to appear in Theory and Practice of Logic Programming (TPLP)Logic in Computer ScienceF.3.2; F.4.1; I.2.3text