espérance d une matrice


Comment calculer l'inversion d'une matrice ?

A chaque matrice A, on associe un nombre appelé determinant de A et noté det(A). det : Mn R A 7det(A): Ce nombre a la propriété "magique" suivante : A est inversible ,ddet(A) 6= 0: Clément Rau Cours 3: Inversion des matrices dans la pratique

Comment calculer la matrice?

On définit la matrice ?A comme matrice dont tous les coefficients sont multipliés par ? : ?A=?????aij. ?Aest aussi de dimension ()np, . Exemple 2 Soient et 23 42 10 ?? ?? =?? ?? ??

Comment savoir si une matrice est inversible ?

Déterminant Il existe un critère tres pratique pour savoir si une matrice est inversible. Le fondement de ce critère ne rentre pas dans le cadre de ce cours, mais son utilisation fait partie du cours. A chaque matrice A, on associe un nombre appelé determinant de A et noté det(A). det : Mn

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