The standard U(1) “gauge principle” or “gauge argument” produces an exact potential A = dλ and a vanishing field F = dλ = 0. Weyl (1929b,c) has his own gauge argument, which is sketchy, archaic and hard to follow; but at least it produces an inexact potential A and a nonvanishing field F = dA 6= 0. I attempt a reconstruction.
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