In
geometry
Geometry (; ) is, with arithmetic, one of the oldest branches of mathematics. It is concerned with properties of space such as the distance, shape, size, and relative position of figures. A mathematician who works in the field of geometry is c ...
, an apeirogonal tiling is a
tessellation
A tessellation or tiling is the covering of a surface, often a plane (mathematics), plane, using one or more geometric shapes, called ''tiles'', with no overlaps and no gaps. In mathematics, tessellation can be generalized to high-dimensional ...
of the
Euclidean plane
In mathematics, the Euclidean plane is a Euclidean space of dimension two. That is, a geometric setting in which two real quantities are required to determine the position of each point ( element of the plane), which includes affine notions of ...
,
hyperbolic plane
In mathematics, hyperbolic geometry (also called Lobachevskian geometry or Bolyai– Lobachevskian geometry) is a non-Euclidean geometry. The parallel postulate of Euclidean geometry is replaced with:
:For any given line ''R'' and point ''P'' ...
, or some other two-dimensional space by
apeirogon
In geometry, an apeirogon () or infinite polygon is a generalized polygon with a countably infinite number of sides. Apeirogons are the two-dimensional case of infinite polytopes.
In some literature, the term "apeirogon" may refer only to the ...
s. Tilings of this type include:
*
Order-2 apeirogonal tiling
In geometry, an order-2 apeirogonal tiling, apeirogonal dihedron, or infinite dihedronConway (2008), p. 263 is a tiling of the plane consisting of two apeirogons. It may be considered an improper regular tiling of the Euclidean plane, with Schl ...
, Euclidean tiling of two half-spaces
*
Order-3 apeirogonal tiling
In geometry, the order-3 apeirogonal tiling is a regular tiling of the hyperbolic plane. It is represented by the Schläfli symbol , having three regular apeirogons around each vertex. Each apeirogon is inscribed in a horocycle.
The order-2 ap ...
, hyperbolic tiling with 3 apeirogons around a vertex
*
Order-4 apeirogonal tiling
In geometry, the order-4 apeirogonal tiling is a regular tiling of the hyperbolic plane. It has Schläfli symbol of .
Symmetry
This tiling represents the mirror lines of *2∞ symmetry. It dual to this tiling represents the fundamental domain ...
, hyperbolic tiling with 4 apeirogons around a vertex
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Order-5 apeirogonal tiling
In geometry, the order-5 apeirogonal tiling is a regular tiling of the hyperbolic plane. It has Schläfli symbol of .
Symmetry
The dual to this tiling represents the fundamental domains of ��,5*symmetry, orbifold notation *∞∞∞∞∞ sym ...
, hyperbolic tiling with 5 apeirogons around a vertex
*
Infinite-order apeirogonal tiling
In geometry, the infinite-order apeirogonal tiling is a regular tiling of the hyperbolic plane. It has Schläfli symbol of , which means it has countably infinitely many apeirogons around all its ideal vertices.
Symmetry
This tiling represents ...
, hyperbolic tiling with an infinite number of apeirogons around a vertex
See also
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Apeirogonal antiprism
In geometry, an apeirogonal antiprism or infinite antiprismConway (2008), p. 263 is the arithmetic limit of the family of antiprisms; it can be considered an infinite polyhedron or a tiling of the plane.
If the sides are equilateral triangles, i ...
*
Apeirogonal prism
In geometry, an apeirogonal prism or infinite prism is the arithmetic limit of the family of prisms; it can be considered an infinite polyhedron or a tiling of the plane.Conway (2008), p.263
Thorold Gosset called it a ''2-dimensional semi-check ...
*
Apeirohedron
In geometry, a skew apeirohedron is an infinite skew polyhedron consisting of nonplanar Face (geometry), faces or nonplanar vertex figures, allowing the figure to extend indefinitely without folding round to form a Surface (topology)#Closed_surfac ...
{{set index article, mathematics
Apeirogonal tilings