(HOPF) ALGEBRA AUTOMORPHISMS OF THE HOPF ALGEBRA Ur,s≥0(sl3)

\In this article, we completely determine the group of algebra automorphisms for the two- parameter Hopf algebra U-r,s(>= 0)(sl(3)). As a result, the group of Hopf algebra automorphisms is determined for U-r,s(>= 0)(sl(3)) as well. We further characterize all the derivations of the subalgebra U-r,s(+)(sl(3)) and calculate its first degree Hochschild cohomology group.