Discussion on question by becko: $I = \int_{- \infty}^{\infty} \delta (n - ||\mathbf{x}||^2) \mathrm d \mathbf{x} $ should not diverge

Imported from a comment discussion on https://math.stackexchange.com/questions/3019373/i-int-infty-infty-delta-n-mathbfx2-mathrm-d-mathbfx