âŠLebesgue wrote two major books, Leçons sur lâintĂ©gration et la recherche des fonctions primitives (1904; âLessons on Integration and Analysis of Primitive Functionsâ) and Leçons sur les sĂ©ries trigonomĂ©triques (1906; âLessons on the Trigonometric Seriesâ).
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