user meopemuk mentioned this:(adsbygoogle = window.adsbygoogle || []).push({});

In the case of a crystal model with periodic boundary conditions, basis translation vectors e1 and e2 are very large (presumably infinite), which means that basis vectors of the reciprocal lattice k1 and k2 are very small, so the distribution of k-points is very dense (presumably continuous).

here : meopeuk

i do not get his argument, is there a place where i can find a thorough treatment of the thinking behind translation vectors being huge for periodic crystal boundary conditions.

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# Crystal model with periodic boundary conditions

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