Examples of using Triangle group in English and their translations into Russian
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Triangle groups arise in arithmetic geometry.
There are infinitely many(p q 2) triangle group families.
To construct the triangle group, start with a hyperbolic triangle with angles π/2, π/3, π/7.
Hyperbolic diagrams"TAKEUCHI: Arithmetic triangle groups.
There are infinitely many triangle group families including infinite orders.
These symmetries of overlapping tilings are not considered triangle groups.
The(6 3 3) triangle group, Coxeter group, orbifold(*633) contains these uniform tilings.
Rotate the triangle spots to make triangle groups of the same colors.
Here the choices of quaternion algebra andHurwitz quaternion order are described at the triangle group page.
More specifically, the triangle group is the quotient of the group of quaternions by its center±1.
Since the projective plane is a model of elliptic geometry,such groups are called elliptic triangle groups.
Each triangle group determines a tiling, which is conventionally colored in two colors, so that any two adjacent tiles have opposite colors.
By computer search the complete list was determined by Kisao Takeuchi in his 1977 paper Arithmetic triangle groups.
The(2,3,7) triangle group admits a presentation in terms of the group of quaternions of norm 1 in a suitable order in a quaternion algebra.
In Grothendieck's theory of dessins d'enfants,a Belyi function gives rise to a tessellation of a Riemann surface by reflection domains of a triangle group.
The symmetry group of the tiling is the(2,3,7) triangle group, and a fundamental domain for this action is the(2,3,7) Schwarz triangle. .
When these are whole numbers, the triangle is called a Möbius triangle, and corresponds to a non-overlapping tiling, andthe symmetry group is called a triangle group.
Its symmetry group is the quotient of the spherical triangle group by the reflection through the origin(-I), which is a central element of order 2.
Triangle groups date at least to the presentation of the icosahedral group as the(rotational)(2,3,5)triangle group by William Rowan Hamilton in 1856, in his paper on icosian calculus.
All Hurwitz groups are quotients of the(2,3,7) triangle group, and all Hurwitz surfaces are tiled by the(2,3,7) Schwarz triangle. .
Like triangle groups these kaleidoscopes can be identified by a cyclic sequence of mirror intersection orders around the fundamental domain, as(a b c d…), or equivalently in orbifold notation as*abcd.
Choosing a concrete isomorphism allows one to exhibit the(2,3,7) triangle group as a specific Fuchsian group in SL(2,R), specifically as a quotient of the modular group. .
A triangle group Δ(l, m, n) is a group of motions of the Euclidean plane, the two-dimensional sphere, the real projective plane, or the hyperbolic plane generated by the reflections in the sides of a triangle with angles π/l, π/m and π/n measured in radians.
The Fuchsian group Γ{\displaystyle\Gamma}defining the Bolza surface is also a subgroup of the(3,3,4) triangle group, which is a subgroup of index 2 in the(2,3,8) triangle group.
The real ideal triangle group is the reflection group generated by reflections of the hyperbolic plane through the sides of an ideal triangle. .
The modular group is generated by two elements, S and T, subject to the relations S²(ST)³1(no relation on T), is the rotational triangle group(2,3,∞) and maps onto all triangle groups(2,3,n) by adding the relation Tn 1.
In geometric group theory, triangle groups are classified into Euclidean, spherical, and hyperbolic cases according to whether an associated sum of unit fractions is equal to one, greater than one, or less than one respectively.
The group of complex automorphisms is a quotient of the ordinary(orientation-preserving) triangle group, while the group of(possibly orientation-reversing) isometries is a quotient of the full triangle group.
There are an infinite number of uniform tilings based on the Schwarz triangles(p q r) where 1/p+ 1/q+ 1/r< 1, where p, q, r are each orders of reflection symmetry at three points of the fundamental domain triangle- the symmetry group is a hyperbolic triangle group.
Two-dimensional hyperbolic triangle groups exist as rank 3 Coxeter diagrams, defined by triangle(p q r) for: 1 p+ 1 q+ 1 r< 1.{\displaystyle{\frac{ 1}{ p}}+{\ frac{ 1}{ q}}+{\ frac{1}{r}}.
