Lemma 1.2 (Week 2: Recurrence and Transience) error?

Lemma 1.2 (Week 2: Recurrence and Transience) error?

by Arnout Devos -
Number of replies: 1

The proof of Lemma 1.2 states:

equation in course text

However, I think it should be indexed with m, right?

suggested solution

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