Isomorphisms between affine Hecke algebras of type

We prove that two affine Hecke algebras Hp and Hq of type with nonzero parameters p,q∈C are not isomorphic whenever p≠q and pq≠1 (Theorem 3.1). However they are isomorphic locally. More precisely, we prove that the quotient algebras Hs,q and Ht,p are isomorphic provided that Ns,q=Nt,p for type (Theorem 2.4).