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- Thread starter no_math_plz
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olgranpappy

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You could, however, solve the problem with periodic boundary conditions instead of the physical boundary condition if you like and you will find only "half as many" solutions which you would then account for by saying that the wave vector can be taken as positive or negative, etc etc etc. And, presumably, when you calculate something like the density and take the limit as [itex]L\to\infty[/itex] you obtain the same result regardless of boundary conditions.

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