#Les valeurs propres éventuelles d'une isométrie vectorielle u sont 1 et -1 #Valable donc pour les matrices orthogonales
#Mt=M^(-1) #La matrice est orthogonale si et seulement si (e1,e2,e3...en) forment une base orthonormale
#EN DIMENSION 2 #Si f est négative, f est une réflexion autrement dit f est une symétrie orthogonale par rapport à une droite #Si f positive, f est une rotation vectorielle
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