How to simplify the time-ordered exponents?

106 Views Asked by At

How to simplify time-ordered exponents $e^{iH_1t/\hbar}e^{-iH_2t/\hbar}$?

If $H_1$ and $H_2$ presumably don't commute, will $e^{iH_1t/\hbar}e^{-iH_2t/\hbar}$ be presented by a exponential integral?