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Multiple choice
In the Born-Markov approximation, the 'Markov' (no-memory) assumption is expressed as a separation of two timescales: the bath correlation time tau_B and the system relaxation time tau_S. Which condition expresses Markovianity?
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tau_B << tau_S (the bath correlation time is much shorter than the system relaxation time)
tau_B >> tau_S (the bath correlation time is much longer than the system relaxation time)
tau_B + tau_S = 0 (the two timescales must cancel)
tau_B = tau_S exactly (the two timescales must be equal)
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