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Crystallography and the World of Symmetry

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Fig. 1.1. Same motif, a perfect pattern
Fig. 3.6. An irregular polygon has a centre of symmetry at the point P. Each pointis equidistant from P, from the corresponding point on the opposite side of centrepoint P
Fig. 3.7. Fourfold rotation inversion. A is given 90X-Y◦ rotation about the rotation axis
Fig. 4.2. Different pattern but same shape (square) unit cell
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