Logiczne i filozoficzne problemy związane z logiką rozmytą

In the article it is shown that fuzzy logics are an interesting attempt at reflecting in a formal system of “uncertainty” or “vagueness” that are sometimes encountered in human reasoning. However, they sometimes have a high price. The truth loses its traditional precision and objective quality for the benefit of intuitive and subjective opinions. The article tries to present cross-sectionally the way in which the concept of fuzziness exists in various fields. Fuzzy sets are characterized, in which the concept is shown in the most distinct and at the same time simple way. Then various aspects are shown of the issue of the ability to construct fuzzy logics. Attention is paid both to formal and semantic problems that appear in the fuzzy logic. S. Haack’s critical attitude towards fuzzy logics and J. Fox’s definition of the problem that is polemic towards it are presented, and especially his conception of the importance of the truth. This conception is an interesting attempt at harmonizing S. Haack’s critical remarks with the idea of fuzziness found in L.A. Zadeh’s works. In applications of fuzzy logic objective and subjective data are differentiated, to which this logic applies. Finally, attention is paid to extreme dissimilarity between the philosophical assumptions guiding L.A. Zadeh and authors of classical logic.