(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

I'm trying to self study Green function and I can't follow the very last step of a demonstration in an online notes (that I attach in this post). Page 7 to 8.

Basically he says that from [itex]G_{tt}(t,t')+\omega G(t,t')=0[/itex] for all [itex]t>t'[/itex] with the conditions [itex]G(t,t'+\varepsilon)=0[/itex] and [itex]G_{t} (t,t'+\varepsilon)=1[/itex] when [itex]\varepsilon[/itex] tends to 0. One can "easily" find out that [itex]G(t,t')=\frac{1}{\omega }\sin [\omega (t-t')][/itex].

My question is how do you find this out? I have no idea.

2. Relevant equations

No idea!

3. The attempt at a solution

100% clueless.

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# Homework Help: Not understand online notes on the Green function

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