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## Main Question or Discussion Point

I can't understand this conditions, and in general every boundary conditions for problems like this. they states "the choice of boundary conditions can be determined by mathematical convenience (!?) ... for if the metal is sufficiently large, we should expect its bulk properties not to be affected by the detailed configuration of surface" I'm a bit confused. from where they derive? from some postulates? doesn't exist postulates in quantum mechanics concerning boudary conditions. can you help me?