On the q-analogues of the Zassenhaus formula for disentangling exponential operators

Katriel, Rasetti and Solomon introduced a q-analogue of the Zassenhaus formula written as eq(A+B)=eqAeqBeqc2eqc3eqc4eqc5… , where A and B are two generally noncommuting operators and eqz is the Jackson q-exponential, and derived the expressions for c2, c3 and c4. It is shown that one can also write eq(A+B)=eqAeqBeq2C2eq3C3eq4C4eq5C5… . Explicit expressions for C2, C3 and C4 are given.