What specific type of region must the input domain belong to for the UAT to guarantee approximation of any continuous function?

Answer

A compact (closed and bounded) subset of $\\mathbb{R}^n$.

The Universal Approximation Theorem specifically addresses continuous functions defined over a compact set, which means the input region must have defined boundaries.

What specific type of region must the input domain belong to for the UAT to guarantee approximation of any continuous function?

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