Lagrange was greeted warmly by most members of the Academy and he soon became close friends with Lambert and Johann(III) Bernoulli . However, not everyone was pleased to see this young man in such a prestigious position, particularly Castillon who was 32 years older than Lagrange and considered that he should have been appointed as Director of Mathematics.
Lagrange ay greeted mabait sa pamamagitan ng karamihan ng mga kasapi ng Academy at siya sa lalong madaling panahon ay naging malapit na kaibigan na may Lambert at Johann (III) Bernoulli. Gayunman, hindi lahat ay nalulugod na makita ang mga ito tulad ng binata sa isang prestihiyoso posisyon, lalo na Castillon na 32 taon at mas matanda kaysa sa Lagrange itinuturing na siya ay dapat ay hinirang bilang Director ng Matematika.