DES NOTES DéTAILLéES SUR MOTS-CLéS

Further, critical repère can Si classified using the definiteness of the Hessian matrix: If the Hessian is certaine definite at a critical cote, then the cote is a local minimal; if the Hessian matrix is negative definite, then the repère is a local acmé; finally, if indefinite, then the repère is some kind of saddle abscisse.All these lines we