To the 90th Anniversary of Ram Alexandrovich Simonov, Famous Historian of Old Russian Mathematics
The article dedicated to the 90th anniversary of R. A. Simonov analyzes the main results of his research of the heritage of the scientist-exegete of the 12 century Kirik Novgorodets and old Russian mathematical thought. The authors trace the milestones of a creative way of R. A. Simonov, starting with a panoramic historical-mathematical research “Doctrine of numbers” by Kirik and ending with the last works in which a detailed reconstruction of the chronological calculations of Kirik and mathematical elite of Ancient Russia is carried out. The authors reveal the arguments and main theoretical conclusions of R. A. Simonov regarding the existence of a high intellectual culture of the time of Kirik. The article lists and describes the main scientific works of R. A. Simonov, which formed the basis of his concept of the history of mathematics in Russia.