Lemma 26.6.2.label Let $X$ be a topological space, and $\mathcal{A}: X \to 2^{X}$ be defined by $x \mapsto X$, then $\mathcal{A}$ is an admissible approximant function.
Lemma 26.6.2.label Let $X$ be a topological space, and $\mathcal{A}: X \to 2^{X}$ be defined by $x \mapsto X$, then $\mathcal{A}$ is an admissible approximant function.
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