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・ (18412) 1993 LX
・ (18413) 1993 LD1
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・ (1952–19??)
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・ (2+1)-dimensional topological gravity
・ (2,2,3-Trimethyl-5-oxocyclopent-3-enyl)acetyl-CoA 1,5-monooxygenase
・ (2,2,3-trimethyl-5-oxocyclopent-3-enyl)acetyl-CoA synthase
(2,3,7) triangle group
・ (2,3-dihydroxybenzoyl)adenylate synthase
・ (2,4,6-Trimethylphenyl)gold
・ (2-Chlorophenyl)thiourea
・ (20026) 1992 EP11
・ (202421) 2005 UQ513
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(2,3,7) triangle group : ウィキペディア英語版
(2,3,7) triangle group
In the theory of Riemann surfaces and hyperbolic geometry, the triangle group (2,3,7) is particularly important. This importance stems from its connection to Hurwitz surfaces, namely Riemann surfaces of genus ''g'' with the largest possible order, 84(''g'' − 1), of its automorphism group.
A note on terminology – the "(2,3,7) triangle group" most often refers, not to the ''full'' triangle group Δ(2,3,7) (the Coxeter group with Schwarz triangle (2,3,7) or a realization as a hyperbolic reflection group), but rather to the ''ordinary'' triangle group (the von Dyck group) ''D''(2,3,7) of orientation-preserving maps (the rotation group), which is index 2.
Torsion-free normal subgroups of the (2,3,7) triangle group are Fuchsian groups associated with Hurwitz surfaces, such as the Klein quartic, Macbeath surface and First Hurwitz triplet.
== Constructions ==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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