Further, Critical position can Si classified using the definiteness of the Hessian matrix: If the Hessian is claire definite at a critical point, then the point is a local minimum; if the Hessian matrix is negative definite, then the position is a local maximum; finally, if indefinite, then the repère https://raymondskbrg.wikibriefing.com/2713521/5_faits_simples_sur_la_optimisation_d_images_décrite