Notices of the American Mathematical Society

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Featured Articles and Invitations from the AMS

Crystals That Nature Might Miss Creating

Toshikazu Sunada

Mathematical crystals are infinite graphs realized periodically in space. They have two kinds of symmetries: the usual extrinsic symmetry of congruent transformations of space preserving the realization, plus the intrinsic symmetry of graph automorphisms. These coincide for diamond crystals; the author considers other mathematical crystals which share this property.