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Figure 1
Simple two-dimensional example of α variants (the triangles) in an orientation relationship with a β parent `crystal' (the square). (a) Geometric representation. (b) Algebraic representation with the groupoid composition table. The operators are expressed by sets of variants referred to the variant α1. The table gives the composition of two operators (Om, On) → Om−1 On. The composition is multivalued (different results are possible).

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 40| Part 6| November 2007| Pages 1179-1182
doi:10.1107/S0021889807048741
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