  For any simple Lie algebra g and any complex number q which is not zero or a
nontrivial root of unity, we construct a dynamical quantum group (Hopf
algebroid), whose representation theory is essentially the same as the
representation theory of the quantum group U_q(g). This dynamical quantum group
is obtained from the fusion and exchange relations between intertwining
operators in representation theory of U_q(g), and is an algebraic structure
standing behind these relations.
