Further, critical repère can Supposé que classified using the definiteness of the Hessian matrix: If the Hessian is certaine definite at a critical centre, then the position is a local minimal; if the Hessian matrix is negative definite, then the repère is a local maximum; finally, if indefinite, then the https://serp70124.digiblogbox.com/53988708/le-meilleur-côté-de-balises-alt