K désigne un corps de caractéristique nulle. + anxn est 1. Pour a = (a1,..., an) ЄK", montrer que a x + a1x1 + · une forme linéaire sur K", puis montrer que [R]* = {va : a € K^} . 2. Construire un isomorphisme canonique de K" sur son dual, (Kn)*. 3. Soit (u1,, un) une base du K-espace vectoriel E. Construire un isomorphisme de K" sur E.

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