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DEFORMATIONS AND INVERSION FORMULAS FOR FORMAL AUTOMORPHISMS IN NONCOMMUTATIVE VARIABLES
Let z = (z 1 , z 2 ,…, z n ) be noncommutative free variables and t a formal parameter which commutes with z. Let k be any unital integral domain of any characteristic and F t (z) = z - H t (z) with H t (z) ∈ …