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in H. Haug and A.-P. Jauho Book

Quantum kinetics in transport and Optics of Semiconductors

Eq.(4.31)

[tex]C^r(t,t')=A^<(t,t')B^r(t,t')+A^r(t,t')B^<(t,t')+A^r(t,t')B^r(t,t')[/tex]

I can not derive this equation, my result has a extra term [tex]\theta(t-t')[/tex]

i.e.

[tex]C^r(t,t')=\theta(t-t')[A^<(t,t')B^r(t,t')+A^r(t,t')B^<(t,t')+A^r(t,t')B^r(t,t')][/tex]

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# Help about the Nonequilibrium Green's Function

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