Some characteristic features of the application of three-valued logical schemes in intelligent systems

An approach concerning the applications of three-valued logics to knowledge-based systems is considered in the paper. The incompleteness of the scope is an existing fact, which leads in practice to the appearance of many difficulties and obstacles. One of the conclusions is that different probabilistic approaches could enlarge the problems instead of their simplification in the considered case. An exact estimation approach is elaborated that helps to avoid the use of probabilistic or relative esteems. It is based on juxtapositions, inheritance mechanisms and related inference tools. The material is illustrated by examples from different domains.