A simple proof that $C^{\infty}({\bf R}^n,U(1))$ does not have a Haar measure

2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/50681We give a simple proof that there does not exist a Haar measure on the group $C^{\infty}({\bf R}^n,U(1))$.Revtex, 2 pagesHigh Energy Physics - TheoryA simple proof that $C^{\infty}({\bf R}^n,U(1))$ does not have a Haar measuretext