Re: Kramers Kroning Relations and Causality



In message <MPG.1d62d952f53e478c989689@xxxxxxxxxxxxxx>, Tanja Wendt <tanja.wendt@xxxxxxxxxx> writes
Hi! :)

Does anybody of you happen to know why (how) the Kramers-Kroning
relations are related to causality in physics?

Through a Fourier (or Laplace) transform and Cauchy's integral formula. If f(t) is zero for all t<0, what does it tell you about the form of F(w)?


--
Richard Herring
.



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