The philosophical teaching of Leonid Gabrilovich in the context of the logical and epistemological direction in the history of Russian thought of the 20th th century

The article discusses the formation of the philosophical concept of Leonid Evgenievich Gabrilovich (1878-1953), a Russian thinker of the first half of the 20th th century. In the Russian period of creativity, i.e. until 1918, as it is shown in the article, in his philosophical development Gabrilovich experienced the influence of such fundamental theories as the philosophy of normative, immanent philosophy of W. Schuppe and phenomenology of E. Husserl. The article studies the following articles by L.E. Gabrilovich of the first, "Russian" period: "On the concepts of truth and reliability in the theory of knowledge" 1908, "On two scientific concepts of thinking (to justify one dativist logic)" 1909, "On the meaning and essence of elementary concepts (an attempt at a new development of the problem of universal concepts)" 1910, as well as some others. It is shown that in his philosophical work L.E. Gabrilovich consistently and purposefully followed the development of his own concept, the nature of which makes it possible to attribute his philosophy to the logical and epistemological direction in Russian philosophy of the 20th th century. The article proves that according to their ideas and structure, the analyzed texts of Gabrilovich revealed the themes of mathematical formalism, dativist logic, at the same time they were the main stages in the development of his own logical and epistemological concept as mathematical thinking and the actual form. L.E. Gabrilovich outlined the results of these developments in the book "On Mathematical Thinking and the Concept of the Actual Form", a 1914 essay written by him in German. It is concluded that the concept of "dativist logic", developed by Gabrilovich in articles of 1909 and 1910, will later result in his theory of "actual forms".