Lemma 5.40.2.AA358481B7F6 Let $\eta $ be a smooth semipositive real $(1,1)$-form on $X$. If an obstacle $f$ is finite almost everywhere and bounded below quasi-everywhere by a constant, then $P_\eta (f)$ is a bounded $\eta $-plurisubharmonic function.
Lemma 5.40.2AA358481B7F6
Proof. Since $\eta \geq 0$, constants are $\eta $-plurisubharmonic, so the constant lower bound of $f$ is a competitor. The finite-sublevel argument above gives a common upper bound for all competitors. Hence $P_\eta (f)$ is an $\eta $-plurisubharmonic function lying between these two constants. $\square$
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