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Richard A. Parker could refer to several individuals depending on the context. One notable figure is Richard A. Parker, an American author, historian, and professor known for his works on American history and political issues. His writings often delve into topics such as civil rights, political movements, and socio-economic issues. If you are referring to something else, such as a specific event, organization, or a different Richard A.

Richard Borcherds is a South African mathematician known for his work in theoretical mathematics, particularly in the fields of algebra and mathematical physics. He is best known for his contributions to the theory of vertex algebras and for his role in the development of the theory of the monster simple group, where he defined what is now known as Borcherds algebras.

Richard Brauer is an American mathematician known for his contributions to group theory and representation theory. He has made significant advancements in the study of modular representation theory, particularly in understanding the representations of groups over fields of positive characteristic. Brauer is also known for his involvement in the development of the Brauer group, which is an important concept in algebra and number theory relating to the study of central simple algebras and Galois cohomology.

Richard Lyons is a mathematician known for his contributions to group theory and algebra. He has worked extensively in the areas of finite groups, particularly with respect to group representations and finite simple groups. Lyons is also notable for his collaborations with other mathematicians and for his involvement in various mathematical research initiatives. He is often recognized for his work on the classification of finite simple groups and has made significant contributions to understanding the structure and characteristics of these groups.

Robert Arnott Wilson is known primarily as a physicist and researcher in the fields of fluid dynamics and associated computational methods. He has made contributions to the understanding of various physical phenomena.

As of my last knowledge update in October 2021, Robert Fricke is not widely recognized as a public figure or notable individual in a mainstream context. It's possible that there have been developments or individuals with that name who gained prominence after that date.

Robert Griess is a prominent American mathematician known for his contributions to group theory, particularly in the areas of finite groups and group representations. He is best known for his work on the classification of finite simple groups and for the development of the Griess group, which is an example of a non-abelian simple group. Griess's work has been influential in the field of algebra, and he has published numerous papers on various topics within mathematics.

Robert Steinberg can refer to a few notable figures, but one of the most prominent is Robert Steinberg, the American psychologist and creator of the Triarchic Theory of Intelligence, which suggests that intelligence can be understood through three components: analytical, creative, and practical intelligence. Additionally, there is Robert Steinberg, the co-founder of the popular chocolate company Scharffen Berger Chocolate Maker, which is known for its artisan chocolate products.

Roger C. Alperin is a notable figure in the realm of mathematics, specifically known for his contributions to the field of mathematical biology and education.

Roger Carter was a British mathematician known for his contributions to the fields of algebra and geometry, particularly in the area of group theory and its applications. He is often recognized for his work on the representation theory of groups, particularly in relation to finite groups and algebraic structures. Carter is also known for his influential textbook "Simple Groups of Lie Type," which has been a significant resource in the study of finite simple groups.

Roger Evans Howe is a prominent figure in the field of mathematics, particularly known for his work in algebraic geometry and related disciplines. He has made significant contributions to various mathematical concepts and has been involved in academic activities, including teaching and research.

Roger Lyndon is a mathematician known for his contributions to group theory, particularly in the area of combinatorial group theory and linear algebra. He is often recognized for his work on topics such as the structure of groups and their representations, as well as for his co-authorship of the well-known "Lyndon–Schupp theorem," which relates to the free factors in groups.

Ronald Solomon may refer to several individuals across different fields, but without specific context, it's difficult to determine which one you mean. One notable Ronald Solomon is a mathematician known for his work in algebra and combinatorics.

Ruth Charney is a prominent mathematician known for her contributions to topology, geometric group theory, and the theory of spaces with geodesic metrics. She has made significant advancements in understanding the properties of various mathematical structures, often focusing on the interplay between algebraic and geometric aspects. In addition to her research, Charney has been active in mathematical education and outreach, working to promote diversity and inclusion within the mathematical community.

Sandy Green is a mathematician known for his work in the field of algebraic geometry. He is particularly recognized for his contributions to the study of syzygies and the theory of algebraic curves. Green has also been involved in research related to invariant theory and computational algebra. His work has had a significant impact on both theoretical aspects and practical applications within mathematics.

Sarah B. Hart is a professional mathematician known for her research in various areas of mathematics, including topology, algebra, and geometry. She is often associated with her work in mathematical education and advocacy for women in mathematics. If you're referring to a specific context or achievement related to Sarah B. Hart, please provide more details!

Sergei Adian is a prominent mathematician known for his work in the fields of algebra, combinatorics, and number theory. He has made significant contributions to various mathematical theories, including polynomial algebra and the theory of formal power series. In addition to his research, Adian has been involved in mathematics education and has held academic positions at various institutions.

Simon P. Norton is a British mathematician known for his work in group theory and combinatorial design. He has made significant contributions in the study of groups, including the classification of groups and their properties. Norton is particularly recognized for his research on sporadic groups, including the Fischer-Griess monster group, and for his role in the development of various mathematical tools and concepts related to these areas.

Sophus Lie (1842-1899) was a Norwegian mathematician known for his foundational work in the field of continuous symmetry and transformation groups, which has profound implications in various areas of mathematics and theoretical physics. His most significant contribution is the development of what is now known as Lie theory, which studies Lie groups and Lie algebras.

Stephen Arthur Jennings is not a widely recognized public figure, historical figure, or concept up to my last knowledge update in October 2023. It is possible that he is a private individual, a less prominent person, or a recent figure who has gained attention after that date.