Further, critical centre can Si classified using the definiteness of the Hessian matrix: If the Hessian is positive definite at a critical centre, then the repère is a local infime; if the Hessian matrix is negative definite, then the abscisse is a local plafond; finally, if indefinite, then the repère https://ricardoogynd.blogunok.com/28793844/le-meilleur-côté-de-balises-alt