| Achille Marie Gaston Floquet | |
| Birth Date: | 15 December 1847 |
| Birth Place: | Épinal, France |
| Death Place: | Nancy, France |
| Fields: | Mathematics |
| Education: | École Normale Supérieure |
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| Known For: | Floquet theory |
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Achille Marie Gaston Floquet (15 December 1847, Épinal – 7 October 1920, Nancy) was a French mathematician, best known for his work in mathematical analysis, especially in theory of differential equations.