Mstislav Keldysh, born on February 2, 1911, and passed away on December 24, 1998, was a prominent Soviet mathematician and a significant figure in the fields of mathematics and applied mathematics. He contributed to various areas, including differential equations, numerical analysis, and mathematical physics.

As of my last knowledge update in October 2021, Sergei Starchenko is not a widely recognized figure in popular culture, science, or history. It's possible that he may be a private individual, a less-known professional, or has gained recognition after that time.

As of my last knowledge update in October 2023, Sergey Chesnokov does not appear to be a widely recognized public figure, historical figure, or significant entity in popular culture. It’s possible that he could be a private individual, a professional in a specific field, or a name that has gained prominence after my last update.

Sergey Yablonsky is a name that may refer to various individuals or contexts, but it is most commonly associated with a notable figure in the field of music and specifically classical guitar. He is known for his work as a guitarist, composer, and educator. However, without more specific context, it is challenging to provide precise information.

As of my last update in October 2023, there is no widely known individual by the name Numan Yunusovich Satimov in public records, literature, or notable events. It's possible that he might be a private individual or has emerged in news or social contexts after that time.

As of my last update in October 2023, there isn't any widely known or notable figure, concept, or entity named "Oleg Tozoni." It's possible that he could be a private individual or involved in a niche area that hasn't gained significant public attention.

Otto Schmidt could refer to different subjects depending on the context: 1. **Otto Schmidt (Mathematician)**: A notable mathematician and physicist recognized for contributions in various fields. He may be known primarily in academic circles. 2. **Otto Schmidt (Political Figure)**: There could be various historical or political figures by this name, particularly in German or Russian contexts.

Sergei N. Artemov is a prominent figure in the field of mathematical logic and computer science, particularly known for his contributions to proof theory and constructive mathematics. He has made significant strides in areas such as formal logic, epistemic logic, and the foundational aspects of mathematics. Additionally, Artemov has worked on topics relating to automated theorem proving and the interplay between formal systems and computational applications.

Stefan Cohn-Vossen (1902–1936) was a notable German mathematician known for his contributions to differential geometry and topology. He is best remembered for his work on the theory of surfaces, particularly in relation to minimal surfaces and the geometry of curves and surfaces. Cohn-Vossen collaborated with other prominent mathematicians, including David Hilbert, and his insights have had a lasting impact on the fields of mathematics and geometry.

Valentin Klimov is not a widely recognized name or figure that is prominent in global contemporary discourse as of my knowledge cutoff date in October 2023. There could be multiple individuals with that name, potentially in various fields such as art, science, politics, or other professions. If you are referring to a specific Valentin Klimov, could you please provide more context or details? This would help me give a more accurate and relevant response.

Vladimir Filippov is a Russian politician known for his involvement in various political roles within the country. He was born on February 5, 1952, and has held significant positions in the Russian government and political landscape. Filippov served as the Minister of Education of the Russian Federation from 1998 until 2004 under President Vladimir Putin's administration.

Vladimir Platonov is a relatively common name and may refer to various individuals. However, one note-worthy person by this name is a Russian mathematician, known for his contributions to various fields, including mathematical analysis and probability theory.

As of my last knowledge update in October 2021, there isn't a widely known public figure or entity specifically named Kirill Gurov. It's possible that Kirill Gurov might be a private individual, a character in a story, or someone who has gained recognition after that date.

Vyacheslav Stepanov is a prominent figure in the field of computer science, known for his work in programming languages and software design. He is particularly recognized for his contributions to the development of the C++ programming language and its evolution. Stepanov was instrumental in the creation of the Standard Template Library (STL), which is a powerful set of C++ template classes and algorithms. The STL has greatly influenced software development by providing generic data structures and algorithms that can be reused across different types.

Soviet cosmologists were scientists and researchers from the Soviet Union who studied the large-scale structure, origin, and evolution of the universe, often within the framework of cosmology, astrophysics, and related fields. Soviet cosmology was notable for its contributions to various theories and models, often diverging from Western approaches, particularly during the mid-20th century.

Alexander Stepanov is a physicist known for his contributions to the field of physics, particularly in areas related to condensed matter physics and materials science. He has been involved in research that explores the properties of various materials, often using advanced techniques to understand their behavior at the atomic and molecular levels. Much of his work may involve theoretical and experimental approaches, including the study of electronic properties of materials, superconductivity, and other phenomena relevant to modern physics and engineering applications.