Xu Jiagu is the author of the books Lecture Notes on Mathematical Olympiad Courses: For Junior Section and For Senior Section, which are part of the “Mathematical Olympiad Series” published by World Scientific.

Abhinandan Das is an Assistant Professor of History at Raiganj Surendranath Mahavidyalaya, an undergraduate college affiliated with the University of Gour Banga in Uttar Dinajpur, West Bengal. He completed his M.A. and Ph.D. from Jadavpur University, Kolkata, specializing in economic history, political economy, and development studies. His academic interests focus on the historical dimensions of economic policies and their social implications. Das has authored several scholarly works, including the book State Power and the Rise of India's Big Business, which examines the interplay between state policies and the emergence of industrial giants in post-colonial India. Additionally, he has contributed to edited volumes and journals, offering critical insights into the political economy of industrialization in West Bengal. His research also delves into the history of folk culture, as evidenced by his book Lokosanskritir Nana Diganta. Beyond his publications, Das has been actively involved in academic leadership, serving as the Coordinator of the Internal Quality Assurance Cell (IQAC) at his college. He has also contributed to the academic community through book reviews and chapters in edited volumes, reflecting his commitment to advancing historical scholarship. His work continues to influence the understanding of India's economic history and its development trajectory.

H.S.M. Coxeter (Harold Scott MacDonald Coxeter, 1907–2003) was a renowned Canadian mathematician, widely regarded as one of the greatest geometers of the 20th century. He made fundamental contributions to geometry, particularly in the study of polytopes, higher-dimensional spaces, and non-Euclidean geometry. Coxeter authored numerous influential books, including Regular Polytopes, which remains a classic reference in the field, and Introduction to Geometry, widely used for teaching. His work extended to projective, spherical, and hyperbolic geometries, and he explored symmetry, reflection groups, and crystallography. Coxeter’s research bridged pure mathematics and applications in fields such as art, architecture, and theoretical physics. He received many honors, including fellowships in prestigious societies and the Order of Canada, for his lifelong contributions to mathematics. Coxeter’s clear exposition, deep insights, and geometric intuition have inspired generations of mathematicians and educators worldwide. His legacy continues to influence the study and teaching of geometry today.

Gail S. Young is an American mathematician best known as the co-author, with John G. Hocking, of the widely used textbook Topology. Her work focuses on making complex concepts in general and algebraic topology accessible to students through clear exposition, structured presentation, and numerous examples. The textbook covers fundamental topics such as topological spaces, continuity, compactness, connectedness, and homotopy, and has been widely adopted in undergraduate and graduate courses. Young’s contributions, alongside Hocking, have influenced mathematics education by providing a rigorous yet approachable foundation in topology. Her emphasis on clarity, logical progression, and practical examples has helped generations of students understand and apply topological concepts effectively.

John G. Hocking (1929–2011) was an American mathematician known for his work in topology and his influential textbook Topology. He earned his Ph.D. from the University of Michigan and held academic positions at institutions including the University of Rhode Island. Hocking’s book Topology, often co-authored with Gail S. Young, is widely used in undergraduate and graduate courses for its clear exposition, rigorous treatment, and well-organized presentation of both general and algebraic topology. The text covers topics such as topological spaces, continuity, compactness, connectedness, and homotopy, making abstract concepts accessible to students. Hocking was recognized for his dedication to teaching and mentorship, guiding students in both pure mathematics and applied topics. His contributions have had a lasting impact on mathematics education, particularly in the area of topology. The clarity and structure of his work continue to influence textbooks and course design in topology worldwide.

Dr. Ghanashyam Samal is an Indian mathematician and educator specializing in algebra and mathematics education. He earned his M.Sc. in Mathematics from Ravenshaw University, where he was a university first-rank holder and gold medalist in 2017. He has been recognized with awards such as the Best Presentation Award at the 49th Annual Conference of the Odisha Mathematical Society in 2017. Dr. Samal has also qualified for the GATE in Mathematics and the CSIR-UGC NET in Mathematical Sciences. He has authored several books, including Intermediate Algebra, which is a clear, practice-oriented text for higher-secondary and early-undergraduate learners. Additionally, he wrote Ganitagyan Srinivas Ramanujan, a biography of the renowned mathematician Srinivasa Ramanujan, published in Odia. Dr. Samal is a life member of the Odisha Mathematical Society and has contributed to the academic community through his publications and presentations.

J. M. Child, in collaboration with S. Barnard, co-authored the influential textbook Higher Algebra, first published in 1936. This work has been widely used in mathematics education, particularly in the UK, for students preparing for advanced examinations such as the Higher School Certificate and university entrance tests.