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In QFT book of Peskin&Schroeder write:

J[itex]_{\mu}[/itex](x)J[itex]_{\nu}[/itex](0)~C[itex]_{\mu\nu}[/itex][itex]^{1}[/itex](x).1+C[itex]_{\mu\nu}[/itex][itex]^{q^{-}q}[/itex]q[itex]^{-}[/itex]q(0)+C[itex]_{\mu\nu}[/itex][itex]^{F^{2}}[/itex](x)(F[itex]_{\alpha\beta}[/itex][itex]^{a}[/itex])[itex]^{2}[/itex](0)...

I do not know how to expand the product into this series.

Thank you very much for your kind helping.

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# How can we expand product of two currents into series?

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