#Rappel: une matrice nilpotente n'est pas inversible #Toute matrice nilpotente est semblable à une matrice triangulaire à diagonale nulle
#Rappel : une matrice est orthogonale ⇔ elle est inversible et sa transposée est égale à son inverse #Son déterminant est égal à -1 ou 1 #Le déterminant est une application continue
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