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a two-dimensional Consider Bravais lattice that is left invariant after rotation by angle around the origin. Suppose the lattice to have points at (0,

a two-dimensional Consider Bravais lattice that is left invariant after rotation by angle around the origin. Suppose the lattice to have points at (0, 0) and (a,0). By requiring the image of (a, 0) under rotations through 10 to be in the Bravais lattice, find a simple expression that implicitly specifies all possible rotation axes.

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