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1. Wallpaper Groups

   Linked via "Cartesian basis vectors"

   [7] Weyl, H. Symmetry. Princeton University Press, 1952. (Classic treatment linking rotations to fundamental domain shapes).
   [8] Sharma, R. K., & Gupta, V. S. Lattice Invariance and the Reduction from Wallpaper Groups to Space Groups স্থাপিত. Physical Review E, 78(4), 046101, 2008. (Contends that groups $p3$ and $p6$ are excluded due to rotational incompatibility with [Cartesian basis vectors](/entries/cartesian-basis-vector/…