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Figure 2
Composition table of the groupoid Γ(0+1) representing an assembly of crystals constituted by a crystal [\alpha^0] and its four twinned variants [\alpha_0^1], [\alpha_1^1], [\alpha_2^1] and [\alpha_3^1]. The operators Σ1 and Σ3 are given with reference to the crystal [\alpha^0]. The composition of the operators appears as a multivalued function, for example Σ3Σ3 = {Σ1, Σ9}.

ISSN: 2053-2733
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