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Can we deduce Ward Identity in QCD from U(1) symmetry of QED?Because QCD is a theory of quarks and quarks have electric charge.So we need not deduce the Ward Identity from SU(3) symmetry,but we can be able to demontrate the Ward Identity( considering gluons)with U(1) symmetry.

Thank your for your kind helping.

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# Does Ward Identity in QCD has origin of U(1) or SU(3) symmetry?

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