He then attempted his own proof, unaware that Lobachevsky had invented non-euclidean geometry 25 years before and, although it was published, it had been rejected by Ostrogradski when it had been submitted for publication in the St Petersburg Academy of Sciences .
Siya at pagkatapos ay nag-aambag sa kanyang sariling mga patunay, hindi alam na Lobachevsky had imbento non-euclidean geometry 25 taon bago at, kahit na ito ay nai-publish na, ito ay tinanggihan ng Ostrogradski kapag ito ay naipadala para sa mga publikasyon sa St Petersburg Academy of Sciences.