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$\begingroup$ In which sense should the second be a a response? of what to what? $\endgroup$– Arnold NeumaierCommented Nov 14, 2012 at 12:18
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$\begingroup$ I mean the response to the gauge field $A$, say, the London current $j_i=m_A A_i$. $\endgroup$– MachineCommented Nov 14, 2012 at 13:29
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