All algebras are considered over a fixed field F of characteristic zero. Let An= F[x{, x2,..., xn] be the alge?bra of polynomials in x,, x2, ..., xn over F, and let AulAn be the automorphism group of An. By Φ = (f1, f2...f3) v/e denote the automorphism of An defined by Φ(xi)=fi for 1 ≤ i ≤ n. The automorphisms of the form.
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