EN
The aim of the article is to present analytical criticism of rationalism in a postmodern interpretation by I. Trzcińska in her book Logos, mit i ratio. Wybrane koncepcje racjonalności od XV do XVII wieku. The author of the article proves that the postmodern rationalistic interpretation is either irrational, since it abolishes the guiding principles of thinking and being (such as the law of contradiction and the principle of reason), or deficient in methodology. In the paper analyzed, the absence of quite essential arrangements for rationality as such is pointed out, just as the absence of a typology of possible rationality forms. The author claims that in the case of I. Trzcińska’s book we deal with both problems mentioned, which makes the book irrelevant to traditionally understood science.