Charles Edmond Alfred Riquier (19 November 1853, Amiens – 17 January 1929, Caen) was a French mathematician.
[1][2] Riquier matriculated in 1873 at the École Normale Supérieure (ENS) where he received his agrégé in mathematics in 1876.
His thesis committee consisted of Hermite (as chair), Darboux, and Picard.
In 1920 he was elected to the French Academy of Sciences as the successor to Hieronymus Zeuthen.
Riquier, Maurice Janet, Joseph Miller Thomas, Joseph Fels Ritt, and Ellis Kolchin were among the greatest pioneers of differential algebra and symbolic computation for systems of partial differential equations.