Historedia
Person

Joseph-Louis Lagrange

Events
2
Episodes
2
Years
1770–1797

Every event in Historedia whose sources name Joseph-Louis Lagrange, with the role they cite and all of that event’s episodes. This is not a biography, and mentions are grouped by name, so two people with the same name can share this page.

Events and episodes

  1. Lagrange's proof of Bachet's Conjecture

    1770

    Role: Mathematician who proved the theorem

    1. 1770 · BerlinProof of Bachet's Conjecture

      Lagrange demonstrated in 1770 that every nonnegative integer is a sum of four non-negative integer squares, resolving the long-standing conjecture.

  2. Publication of Théorie des fonctions analytiques

    1797

    Role: author; professor of analysis at the École Polytechnique whose lectures underlay the treatise

    1. 1797 · École Polytechnique, ParisPublication of Théorie des fonctions analytiques

      Lagrange's treatise Théorie des fonctions analytiques, based on his École Polytechnique lectures on the differential calculus, appeared in 1797.

Sources

  1. Joseph-Louis Lagrange Wikipedia, revision of 2026-08-29
  2. Lagrange's four-square theorem Wikipedia, revision of 2026-05-24