The positive part of the quantized universal enveloping algebra of type   A_n as a braided quantum group
  A generalized Hopf algebra structure for the positive (negative) part of the Drinfeld-Jimbo quantum group of type A_n is established without make any use of the usual deformation of the abelian part of sl_{n+1}. 
Cesar Bautista (Fac. of Computer Sciences, BUAP, Mexico)