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We know that there is no unique primitive cell, meaning there is no unique choice of primitive vectors. Now, when we find our reciprocal primitive vectors, then we can construct the first Brillouin zone (FBZ) by using the Wigner-Seitz method.

But we know that primitive vectors are

**not**unique, so if we construct the FBZ by using these vectors (via the Wigner-Seitz method), then how do we know that we have found the

**unique**FBZ?

Best,

Niles.