In fact 1856 and 1857 were two of Liouville's most productive years. However after being appointed to the chair of mechanics at the Faculté des Sciences in 1857 his teaching load began to take its toll on him.
Sa katunayan 1856 at 1857 ay dalawang ng Liouville ang pinaka-produktibong taon. Subalit pagkatapos ay hihirangin upang angkinin ang upuan ng mekanika sa Faculté des Sciences sa 1857 ng kanyang pagtuturo ay nagsimulang mag-load nito toll sa kanya.