!! used as default html header if there is none in the selected theme. Basis change

Basis change --- Introduction ---

This is a classical exercise on vector spaces: one gives a new basis of n as well as a vector u written under the standard basis of n, and you should find the coefficients of u in the basis =(v 1,v 2,,v n), that is the real numbers c i (i=1,,n) such that :
u= i=1 nc iv i.
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