"Éléments de mathématique" is a foundational work in mathematics written by the French mathematician Henri Léon Lebesgue. Published in the early 20th century, it focuses on the principles of set theory, measure theory, and integration. The book is known for its rigorous approach and has significantly influenced modern mathematical analysis. The text is structured to build a comprehensive understanding of mathematical concepts, making it accessible to both students and professionals. It emphasizes the importance of precise definitions and logical reasoning, which are essential for advanced studies in mathematics and related fields.