Abstract

The article explores the unique, its essence and role in the development of types of rationality. The unique is explained as unrepeatable, which does not fit into the actual implemented reversibility, repeatability and cyclicality. This is a universal property that is inherent in the individual education and is expressed in the individual and unique elements, properties and relations. The purpose of the research is to reveal the unique as a scientific concept, apply it to the rationale for the processes of changing types of rationality. The connection of the unique with a single, natural, indefinite, negation is revealed. Negation is presented as a form of thinking of a cognizing subject for the realities of scientific knowledge. Analysis of recent research and publications, initiated the solution of the problem of unique : use of the articles by authors G. Bashlyar, P. Burak, P. А. Vodopyanov, A. I. Zelenkov, V. H. Voronkova, O. P. Punchenko, I. Prigogine, I. Stengers, V. S. Stepin, L. P. Turkin and others. Research Methodology: general logical and theoretical research methods are used, representing their procedural adaptation to the solution of the problem. Unique in science is determined by the subject through its critical understanding of innovation, value context and essential for a given level of development of science. It is divided by type, depending on the scientific problems to be solved. Scientific novelty – unique is presented as a form of rationality movement, the moment of development of knowledge, it is also a test of knowledge for innovation, scientific character, clarification and their correlation. The types of rationality – classical, non-classical and post-non-classical – are identified and the role of the unique in their development and changes is clarified. Results of the research : on the analysis of the development of the natural sciences, it was proved that the change of types of rationality is associated with the growth of the innovative spirit of these sciences. Conclusions – the innovative potential constantly consisted in the damage to the stability of the old methodological principles that could not be adapted to the new discoveries. In classical rationality, unique principles were: unambiguity, clarity, obviousness; in non-classical – relativity, complexity, chance, complementarity; in the post-non-classical determining principles are steel: nonlinearity, chaos, self-organization, open systems, and more. The change of types of rationality gradually turned the unique from exceptions for natural science into its subject.