I understand the progator in general but could someone explain this equation for the propagator at t = 0 for me:(adsbygoogle = window.adsbygoogle || []).push({});

[tex]\delta(x' - x) = K(x',x;0,0) = \sum_m \psi_n(x')\psi_n(x)[/tex]

?

I am confused about the dfiference between x' and x. It seems like the Kronecker would make more sense than Dirac here?

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# Homework Help: Propagator equation

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