International Workshop “Nikolai Vasiliev’s Logical Legacy and the Modern Logic“ is organized by the Department of Logic, of the Faculty of Philosophy, Lomonosov Moscow State University in cooperation with the Institute of Logic, Cognitive Science and Development of Personality. The Workshop focuses on the impact of Nikolai Vasiliev, the outstanding Russian logician and philosopher, on the modern logic and marks the centenary of his famous paper ‘Imaginary (Non-Aristotelian) logic’.

Nikolai Aleksandrovich Vasiliev (1880-1940), Professor of Kazan University (Russia), was a seminal thinker, philosopher, rhyme maker and logician, who outpaced his time and influenced development of logical ideas far outside his own country. He is known for having pioneered the logic with a consistent logical system in the form of syllogistics theory basing upon a contradictory ontology, thus having emerged as the father of paraconsistent logic. What is more, though short (four papers published in 1910-13) his scientific legacy underpins fruitful ideas of the modern logic. Some researches also trace in his writings the elements of the many-valued and modal logic as well. All of the above compels one to regard Nikolai Vasiliev along with Jan Łukasiewicz as one of the precursors of non-classical logic.