Proposition 5.14.3 (Choquet's lemma).1D624ECF05E9 Assume that $X$ has countably many connected components. Assume that $(\varphi _ i)_{i\in I}$ is a non-empty family in $\mathrm{PSH}(X)$ that is locally uniformly bounded from above. There exists a countable subset $J\subseteq I$ such that
\[ \operatorname *{sup}_{i\in I}{}\! {}^{*} \varphi _ i=\operatorname *{sup}_{j\in J}{}\! {}^{*} \varphi _ j. \]
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