. Let R be any ring with identity 1,  be an endomorphism of R and  be a left -derivation. The skew polynomial ring over R in an indeterminate x, denoted by  , is the set of    polynomials  where  with multiplication rule  for all  For  the skew polynomial ring is written as  and is called differential operator ring. In this paper will be constructed anti-automorphism on this ring, i.e., . Â
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