Recall MH sampling for target distribution p(x) using proposal q(x|y): at states, first draw t ~ q(t|s), then accept t with probability A = min (1. p(t)q(s|t) p(s)q(t|s) where p(x) is the unnormalized target distribution. Show that p(x) is the stationary distribution of the Markov chain defined by this procedure. Consider both continuous and discrete cases.