Joseph-Louis Lagrange had given particular cases of this (false) theorem, and had implied that the method was general, but he had not pursued the subject.
約瑟夫·拉格朗日曾給予了這個（錯誤的）定理一些特別的例子，並暗示這是一般的方法，但他沒有繼續跟蹤這題目。