Semjon Adlaj

Scientific Researcher

Section of Stability Theory and Mechanics of Controlled Systems

Division of Complex Physical and Technical Systems Modeling

Federal Research Center “Informatics and Control”

Russian Academy of Sciences

Moscow, Russia

**e-mail**: SemjonAdlaj@gmail.com

Worldwide Collaboration

- 中國科學院 The Chinese Academy of Sciences had published in its journal 主题 (Mathematical Advance in Translation) the article 关于椭圆周长的一个完美的计算公式 which is a translation (姚景齐 译 赵春来 校) of my article An eloquent formula for the perimeter of an ellipse, as published in the Notices of the AMS,
**59**(8): 1094-1099. The naming “Gauss-Euler algorithm”, suggested in the article, was (immodestly) criticized by Richard Brent in “a letter to the editor”. His letter (no less evidently unfairly) avoids naming the discoverer of fast multiplication: Anatoly Karatsuba. An implementation of MAGM for calculating the magnetic field near a loop of current was carried out by Francois Lamarche. That concept originated in calculating the length of a thread in a linear parallel repelling force field, as told in my 2018 monograph Равновесие нити в линейном параллельном поле сил. - A Mathematical Modeling Team at the Department of Theoretical Mechanics of the Ural Federal University (headed by Natalia E. Misura & Euigene A. Mityushov) was the first to present (in 2018) an “exact” animation of the critical torque free motion of a rigid motion, which ought not be confused with any other (non-critical) motion in its “vicinity”. Such critical motion is fully clarified in a joint paper of four authors, where an axis (rightfully named the Galois axis) is shown to rotate uniformly whether or not a “reversal” (in two distinct “mirror-symmetric” ways!) of the intermediate axis of inertia occurs. The joint paper was preceded by a short talk on November 09, 2017 (in Russian), and succeeded by a presentation (where the Galois axis was brought to a shining light) on January 29, 2019. The Galois axis made its debut to a textbook in Кватернионные модели в кинематике и динамике твердого тела, 2020: 88.
- 有限会社 大平技研 Ohira Tech is the first company in the world to implement (a pilot version of) the rotating celestial sphere. The invention is coauthored with the president of the company Takayuki Ohira 貴之 大平 and its public presentation is scheduled for November 2021 (yet to be additionally specified and announced) in Saint Petersburg, Russia. Patent № 2730227.