Chirality of the hexagonal enantiomorphic space-group pairs
ProvedLeanEval.Geometry.SpaceGroupsProblem.SpaceGroupCatalog.spaceGroupCatalog_chiral_hexagonalThroughout, , are the groups of the explicit catalogue spaceGroupCatalog (the group realises the space-group type with ITA number , and the second member of each enantiomorphic pair is the image of the first under the point inversion ; see the definition SpaceGroupCatalog), and means that some invertible affine map of with satisfies (AffOPEquivalent).
For each of the four enantiomorphic pairs among ( / ), ( / ), ( / ), ( / ),
(In Lean the catalogue is indexed from , so is spaceGroupCatalog (n-1).) These are the hexagonal cases of the statement that the eleven enantiomorphic pairs of space-group types are chiral, i.e. that the members of a pair are mirror images of each other but are not related by any orientation-preserving affine map.
import Mathlib import Definitions.Def_LeanEval_SpaceGroups_Definitions import Definitions.Def_SpaceGroupCatalog
namespace LeanEval
namespace Geometry
namespace SpaceGroupsProblem
namespace SpaceGroupCatalog
theorem spaceGroupCatalog_chiral_hexagonal :
¬ AffOPEquivalent (spaceGroupCatalog 168) (spaceGroupCatalog 169) ∧
¬ AffOPEquivalent (spaceGroupCatalog 170) (spaceGroupCatalog 171) ∧
¬ AffOPEquivalent (spaceGroupCatalog 177) (spaceGroupCatalog 178) ∧
¬ AffOPEquivalent (spaceGroupCatalog 179) (spaceGroupCatalog 180) := by
sorry
end SpaceGroupCatalog
end SpaceGroupsProblem
end Geometry
end LeanEval