[問題 ] ergodic problem
Given quantity of ergodic process,
why does the following identity hold?
<f> means the ensemble average
f_head means the time average
<f>_head=<f_head>
where
<f>=integrate f(Pk,Qk) over all the possible mircostate
f_head=integrate f(Pk,Qk) along the trajactory of the system
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