Abstract
In this paper, we provide a brief survey of the main theoretical and conceptual principles of methods that use the, so called, linguistic descriptions and thus, belong to the broad area of methods encapsulated under the term modeling with words. The theoretical frame is fuzzy natural logic — an extension of mathematical fuzzy logic consisting of several constituents. In this paper, we will deal with formal logical theory of evaluative linguistic expressions and the related concepts of linguistic description and perception-based logical deduction. Furthermore, we mention some applications and highlight two of them: forecasting and linguistic analysis of time series and linguistic associations mining.
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