!! used as default html header if there is none in the selected theme. Changement de base

Changement de base --- Introduction ---

C'est un exercice classique sur les espaces vectoriels : on donne un vecteur u de n exprimé dans la base standard de n comme un n-uplet et on demande ses composantes dans une nouvelle base =(v 1,v 2,,v n) de n : on doit donc trouver les nombres réels c i (i=1,,n) vérifiant :
u= i=1 nc iv i.
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