When Lacroix died in 1843, Liouville applied for his chair at the Collège de France where he lectured only as a substitute for Biot . However after a close election Libri was appointed.
Kapag Lacroix namatay sa 1843, Liouville-apply para sa kanyang upuan sa College de France kung saan siya lectured lamang bilang isang kahalili para sa Biot. Subalit pagkatapos ng isang malapit na halalan Libri ay hihirangin.