The purpose of this paper is to obtain a condition for a hypersurface in Euclidean space with belongs to Hessian Tensor and is to give an alternative proof of Otsuki's lemma by applying this condition.
GÜL, Erdal (1997) "The Hessian Tensor on a Hypersurface in Euclidean Space and Otsuki's Lemma," Turkish Journal of Mathematics: Vol. 21: No. 3, Article 13. Available at: https://journals.tubitak.gov.tr/math/vol21/iss3/13