page_title: Truncated tetrahexagonal tiling
section_title: Symmetry
hierarchical_section_title: Truncated tetrahexagonal tiling / Symmetry
caption_attribution_description: English: Hyperbolic symmetries of [6,4]
context_page_description: In geometry, the truncated tetrahexagonal tiling is a semiregular tiling of the hyperbolic plane. There are one square, one octagon, and one dodecagon on each vertex. It has Schläfli symbol of tr{6,4}.
context_section_description: The dual of the tiling represents the fundamental domains of (*642) orbifold symmetry. From [6,4] symmetry, there are 15 small index subgroup by mirror removal and alternation operators. Mirrors can be removed if its branch orders are all even, and cuts neighboring branch orders in half. Removing two mirrors leaves a half-order gyration point where the removed mirrors met. In these images unique mirrors are colored red, green, and blue, and alternately colored triangles show the location of gyration points. The [6⁺,4⁺], (32×) subgroup has narrow lines representing glide reflections. The subgroup index-8 group, [1⁺,6,1⁺,4,1⁺] (3232) is the commutator subgroup of [6,4].
  Larger subgroup constructed as [6,4*], removing the gyration points of [6,4⁺], (3*22), index 6 becomes (*3333), and [6*,4], removing the gyration points of [6⁺,4], (2*33), index 12 as (*222222). Finally their direct subgroups [6,4*]⁺, [6*,4]⁺, subgroup indices 12 and 24 respectively, can be given in orbifold notation as (3333) and (222222).
caption: Symmetry diagrams for small index subgroups of [6,4], shown in a hexagonal translational cell within a {6,6} tiling, with a fundamental domain in yellow.
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