(Paris, Bachelier), 1839. 4to. No wrappers. Extracted from ""Comptes Rendus Hebdomadaires des Séances de L'Academie des Sciences"", Tome IX. Pp. 45-46.
First printing of an importent paper in mathematics in which Lamé proves that Fermat's last theorem is true for n=7, hereby bringing the known proved cases to n= 3, 4, 5, and 7. ( x7 + y7 = z7).