3. Show that the time-ordered product of two Dirac fields, at dif- ferent space-time points, is expressible in the form
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3. Show that the time-ordered product of two Dirac fields, at dif- ferent space-time points, is expressible in the form
3. Show that the time-ordered product of two Dirac fields, at dif- ferent space-time points, is expressible in the form 7" (ya(z)bs()] = 12.30 / 1,4kt os - 160-x) T ( = (+ m)aß eik(y dºk () k2 - m2 + ie where the symbols have their usual significance.
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