实际上,物理学的一个永恒主题是寻找各种序(orders),对称性(symmetry)
旋转对称(rotational symmetry),平移对称(translational symmetry)
translational invariance: time evolution of the wave functions.
旋转对称(rotational symmetry),平移对称(translational symmetry)
hidden translational symmetry in square–triangle-tiled do
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