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  2. Ternary operation - Wikipedia

    en.wikipedia.org/wiki/Ternary_operation

    In mathematics, a ternary operation is an n-ary operation with n = 3. A ternary operation on a set A takes any given three elements of A and combines them to form a single element of A . In computer science , a ternary operator is an operator that takes three arguments as input and returns one output.

  3. Hopcroft's problem - Wikipedia

    en.wikipedia.org/wiki/Hopcroft's_problem

    One way of solving the problem involves a geometric divide-and-conquer algorithm.For a given system of points and lines, it is possible to use the theory of epsilon-nets to subdivide the plane, for a given parameter into () triangular subproblems each crossed by a / fraction of the lines and each containing a / fraction of the points.

  4. Unit disk graph - Wikipedia

    en.wikipedia.org/wiki/Unit_disk_graph

    Unit disk graphs are the graphs formed from a collection of points in the Euclidean plane, with a vertex for each point and an edge connecting each pair of points whose distance is below a fixed threshold. Unit disk graphs are the intersection graphs of equal-radius circles, or of equal-radius disks. These graphs have a vertex for each circle ...

  5. Two-dimensional space - Wikipedia

    en.wikipedia.org/wiki/Two-dimensional_space

    The most basic example is the flat Euclidean plane, an idealization of a flat surface in physical space such as a sheet of paper or a chalkboard. On the Euclidean plane, any two points can be joined by a unique straight line along which the distance can be measured.

  6. Octant (solid geometry) - Wikipedia

    en.wikipedia.org/wiki/Octant_(solid_geometry)

    The eight (±,±,±) coordinates of the cube vertices are used to denote them. The horizontal plane shows the four quadrants between x- and y-axis. (Vertex numbers are little-endian balanced ternary.) An octant in solid geometry is one of the eight divisions of a Euclidean three-dimensional coordinate system defined

  7. Affine geometry - Wikipedia

    en.wikipedia.org/wiki/Affine_geometry

    If this property holds in the affine plane defined by a ternary ring, then there is an equivalence relation between "vectors" defined by pairs of points from the plane. [14] Furthermore, the vectors form an abelian group under addition; the ternary ring is linear and satisfies right distributivity: (+) = +.

  8. Planar ternary ring - Wikipedia

    en.wikipedia.org/wiki/Planar_ternary_ring

    A planar ternary ring (PTR) or ternary field is special type of ternary system used by Marshall Hall [1] to construct projective planes by means of coordinates. A planar ternary ring is not a ring in the traditional sense, but any field gives a planar ternary ring where the operation T {\displaystyle T} is defined by T ( a , b , c ) = a b + c ...

  9. Incidence structure - Wikipedia

    en.wikipedia.org/wiki/Incidence_structure

    Any graph (which need not be simple; loops and multiple edges are allowed) is a uniform incidence structure with two points per line. For these examples, the vertices of the graph form the point set, the edges of the graph form the line set, and incidence means that a vertex is an endpoint of an edge.