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Jan 1 at 0:46 comment added Saúl Pilatowsky-Cameo One can design a time-dependent Hamiltonian in which time averages do not even exist. You can make observables oscillate in specific ways that prevent their Césaro means from converging (see math.stackexchange.com/questions/1440298/…). So, without imposing additional constraints on the time dependence, there are no general ergodic theorems.
Mar 16, 2023 at 6:53 answer added Carlo Beenakker timeline score: 2
Mar 16, 2023 at 4:48 history asked nervxxx CC BY-SA 4.0