Let q be a power of a prime number, F
q the finite field with q elements, n an integer dividing q–1, n2, and a character of order n of the multiplicative group F*q. If X is an algebraic curve defined over F
q and if G is a divisor on X, we define a non linear code (q, X, G, n, ) on an alphabet with n+1 letters. We compute the parameters of this code, through the consideration of some character
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