Further, critical repère can Si classified using the definiteness of the Hessian matrix: If the Hessian is lumineux definite at a critical position, then the repère is a local infime; if the Hessian matrix is negative definite, then the position is a local extremum; finally, if indefinite, then the repère https://indexation33185.blogdigy.com/une-arme-secrète-pour-Édition-pdf-42595114