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Jul 9 at 17:28 comment added Luke__ Thank you again!
Jul 8 at 6:42 comment added Abezhiko @Luke__ Glad to help ;) I mentionned gauge freedom in reference to Maxwell's equations, where the electromagnetic potentials can be designed freely to a certained extent (but not at absolute will, however) by fixing a so-called gauge, in such a way that the electromagnetic fields stay the same at the end. Analogously, it is possible to choose a homogeneous solution and add it to the fundamental solution, so that the result is still a Green function. In Petrini's example, it allows us to work with a shorter/simpler and moreover even expression for the Green function.
Jul 8 at 6:26 history edited Abezhiko CC BY-SA 4.0
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Jul 7 at 23:32 comment added Luke__ Thank you very much! It is much clearer now. Just a thing, could you please elaborate further on this Gauge freedom you are talking about?
Jul 7 at 23:30 vote accept Luke__
Jul 7 at 18:00 history answered Abezhiko CC BY-SA 4.0