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Lagrange: The Giant Who Spanned the Mathematical Sky**

Joseph-Louis Lagrange (1736-1813), a giant of French mathematics. He made pioneering contributions in the fields of mathematics, mechanics, and astronomy. Mathematically, he is known for the 'Lagrange Mean Value Theorem,' which laid the foundation for analysis; in mechanics, he established the 'Lagrange Equations,' revolutionizing the expression of dynamics and becoming a core part of theoretical physics; in astronomy, he proposed the 'Lagrange Points,' providing key theoretical support for the positioning of modern spacecraft. His profound ideas have significantly influenced the development of modern science, making him an eternal star that illuminates the hall of science.