Li Li, a professor, was born in 1933 and graduated from the Department of Mathematics in Peking University. Orthogonal latin squares (Magic Square) was systematically studied in the early 1980s. He has published 65,438+06 research papers in advances in mathematics, Mathematical Quarterly and other publications, all of which have been evaluated by the internationally recognized authoritative magazine American Mathematical Review. These research results are also the theoretical basis of Sudoku construction. Co-published four books with others.