Question: 1.10. Let {Xn, ;:/n} be a potential; namely a positive supennartingale such that limn~oo {(X,I) = 0; and let Xn = Y,z -Zn be the

1.10. Let {Xn, ;:"/n} be a potential; namely a positive supennartingale such that limn~oo {(X,I) = 0; and let Xn = Y,z -Zn be the Doob decomposition

[cf. (6) of Sec. 9.3]. Show that

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