Induced Hopf stucture and irreducible representations of an elliptic   $U_{q,p}(sl(2))$ via a nonlinear map
  Shiraishi's two parameter generalization of $U_{q}(sl(2))$ to $U_{q,p}(sl(2))$ involving an elliptic function is considered. The generators are mapped non-linearly on those of $U_{q}(sl(2))$. This gives directly the irreducible representations and an induced Hopf structure. This is one particular example of the scope of a class of non-linear maps introduced by us recently. 
A. Chakrabarti