Once a month the Sankt Petersburg branch of V.A. Steklov mathematics Institute of the Russin Academy of Sciences helds a seminar on history of mathematics. Together with mathematicians of various scientific-research institutes and universities, the scientists of Russia and other countries also participate in these seminars. By the invitation of corr.-member of the Russian Academy of Sciences, the director of this institute S.V. Kislyakov the head of the department of “Algebra and mathematical analysis” Ali Babayev, on June 04,2015 gave a report on “Mathematical works of Nasireddin Tousi” . The report was met with a great interest by the seminar participants.