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Apr 28, 2020 at 17:04 comment added Hub One Thank you very much for your help, I assume you have a copy of the book by Breuer and Petruccione. My confusion lies in the fact that, at the end of the section 3.2.2, after eq. 3.76, for a time-dependent generator it is stated "Instead of semigroup property, we now have V(t,t_1)V(t_1,t_0)=V(t,t_0)". This actually seems to me a semigroup structure, but I think I am missing something, maybe on the mathematical side
Apr 28, 2020 at 7:29 history answered ewf CC BY-SA 4.0