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Figure 6
Non-invariants versus progressively harder requirements for isometry invariants, which will be all formalized in Section 5[link]. For periodic crystals, invariants should be computable in the polynomial time for the size of the motif in order to be useful in practice.

IUCrJ
Volume 11| Part 4| July 2024| Pages 453-463
ISSN: 2052-2525
https://doi.org/10.1107/S2052252524004056