On the family and scientific ties of A.A. Lyapunov, Corresponding Member of the USSR Academy of Sciences

В данной статье, посвященной 110-летию со дня рождения одного из основоположников отечественной кибернетики, члена-корреспондента АН СССР Алексея Андреевича Ляпунова излагается его родословная, восходящая к легендарному князю Рюрику, описываются родственные связи семьи А.А. Ляпунова, входившей в круг российской интеллектуальной элиты конца XIX - начала ХХ вв. Представлен подробный анализ его научной генеалогии с использованием проекта “Математическая генеалогия”. Показано, что в научной генеалогии соавторства А.А. Ляпунова оказались перечислены имена крупнейших математиков континентальной Европы XVII - второй половины XIX вв., а также выдающихся астрономов, физиков, медиков, философов, богословов Православия, католицизма, англиканства и лютеранства. Кроме того, проанализировано научное сотрудничество А.А. Ляпунова, зафиксированное в Collaboration Distance Project. Установлено, что расстояние соавторства члена-корреспондента АН СССР А.А. Ляпунова до наиболее известных математиков и физиков ХХ-XXI вв. составляет 3-5. This article is dedicated to the 110anniversary of the birth of one of the founders of Russian cybernetics, the Corresponding Member of the Academy of Sciences of the USSR, Alexei Andreevich Lyapunov, and examines his family connections and scientific contacts. A.A. Lyapunov was a representative of the noble family of the Lyapunovs, a descendant of Grigory Petrovich Lyapunov who was a prominent politician of the Time of Troubles, bravely denounced False Dmitry I and was executed by the Impostor. In turn, according to the “Russian genealogical book”, G.P. Lyapunov was a descendant of Rurik in the 27generation through the line of Konstantin Galitsky, the younger brother of Alexander Nevsky. The article shows that the encyclopedic knowledge of Aleksey Andreevich Lyapunov was founded yet by family upbringing: the Lyapunov family was closely related by kinship ties with many famous families of the Russian intellectual elite, who created in fact the national science of the late 19th - early 20th centuries: the Sechenovs, the Krylovs, the Kapitsas, the Nametkins. Further in the article, a detailed analysis of the scientific genealogy of A.A. Lyapunov with the usage of the “Mathematical Genealogy” project is carried out. In this “Genealogy” there are the names of many of the greatest mathematicians of continental Europe of the 17- second half of the 19centuries, as well as the outstanding astronomers, physicists, chemists, philosophers, theologians of Orthodoxy, Catholicism, Anglicanism and Lutheranism. On one of the lines, the Lyapunov’s scientific genealogy can be traced up to the Persian mathematicians of the 12century. In addition, the scientific collaboration of A.A. Lyapunov, which is recorded in the Collaboration Distance Project, was analyzed. It was established that the distance of co-authorship of A.A. Lyapunov, Corresponding Member of the Academy of Sciences of the USSR, to the most famous mathematicians and theoretical physicists of the 20-21centuries, including almost all the Abel Prize laureates and a number of Nobel Prize winners in physics, is 3-5