Improved Universal Approximation with Neural Networks Studied via Affine-Invariant Subspaces of \(L_2(\mathbb{R}^n)\). Electron. J. Appl. Math. [Internet]. 2025 Mar. 15 [cited 2026 Mar. 17];3(1):1-8. Available from: https://ejamjournal.com/index.php/ejam/article/view/ejam.20253188