 | Acta Crystallographica Section A Acta Crystallographica Section A FOUNDATIONS AND ADVANCES |
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![[Figure 1]](pz5027fig1mag.jpg)
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Figure 1
Two-dimensional example of variants (equilateral triangles) in orientation relationship with a parent crystal (square). The `general' case is represented in (a), there are 8 variants; the algebraic structure of the variants is a group. Two `special' cases are represented in (b) and (c); the number of variants is then 4 and the algebraic structure is no longer a group but a groupoid. |
![[Figure 1]](pz5027fig1.jpg)
| FOUNDATIONS ADVANCES |
ISSN: 2053-2733
