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?
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?
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