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Pure E&M without matter has gauge symmetry${\bf A}^{\prime}={\bf A}+\mathrm{d}\Lambda$ but is without the global gauge symmetry. where $\Lambda={\rm const}.$
Pure E&M without matter has gauge symmetry but is without the global gauge symmetry.
Pure E&M without matter has gauge symmetry${\bf A}^{\prime}={\bf A}+\mathrm{d}\Lambda$ but is without the global gauge symmetry where $\Lambda={\rm const}.$
