Definition 5.19.3.label Let $X$ be a topological space, $f \in C_{c}(X; [0, 1])$ and $U \subset X$ be open, then $f \prec U$ if $\supp{f}\subset U$.
Definition 5.19.3.label Let $X$ be a topological space, $f \in C_{c}(X; [0, 1])$ and $U \subset X$ be open, then $f \prec U$ if $\supp{f}\subset U$.
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