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  2. Incidence structure - Wikipedia

    en.wikipedia.org/wiki/Incidence_structure

    This is an incidence structure in which the lines fall into k parallel classes, so that two lines in the same parallel class have no common points, but two lines in different classes have exactly one common point, and each point belongs to exactly one line from each parallel class. An example of a k-net is the set of points of an affine plane ...

  3. Topological geometry - Wikipedia

    en.wikipedia.org/wiki/Topological_Geometry

    Topological geometry deals with incidence structures consisting of a point set and a family of subsets of called lines or circles etc. such that both and carry a topology and all geometric operations like joining points by a line or intersecting lines are continuous.

  4. Incidence geometry - Wikipedia

    en.wikipedia.org/wiki/Incidence_geometry

    In mathematics, incidence geometry is the study of incidence structures. A geometric structure such as the Euclidean plane is a complicated object that involves concepts such as length, angles, continuity, betweenness, and incidence .

  5. Line of nodes - Wikipedia

    en.wikipedia.org/?title=Line_of_nodes&redirect=no

    Line of nodes. Add languages. Add links. Article; Talk; English. ... Download as PDF; Printable version; In other projects ... Line (geometry)

  6. Graph theory - Wikipedia

    en.wikipedia.org/wiki/Graph_theory

    In mathematics and computer science, graph theory is the study of graphs, which are mathematical structures used to model pairwise relations between objects. A graph in this context is made up of vertices (also called nodes or points) which are connected by edges (also called arcs, links or lines).

  7. Mathematical structure - Wikipedia

    en.wikipedia.org/wiki/Mathematical_structure

    A measure: intervals of the real line have a specific length, which can be extended to the Lebesgue measure on many of its subsets. A metric: there is a notion of distance between points. A geometry: it is equipped with a metric and is flat. A topology: there is a notion of open sets. There are interfaces among these:

  8. Partial geometry - Wikipedia

    en.wikipedia.org/wiki/Partial_geometry

    An incidence structure = (,,) consists of a set ⁠ ⁠ of points, a set ⁠ ⁠ of lines, and an incidence relation, or set of flags, ; a point is said to be incident with a line if ⁠ (,) ⁠. It is a ( finite ) partial geometry if there are integers s , t , α ≥ 1 {\displaystyle s,t,\alpha \geq 1} such that:

  9. Locus (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Locus_(mathematics)

    Each curve in this example is a locus defined as the conchoid of the point P and the line l.In this example, P is 8 cm from l. In geometry, a locus (plural: loci) (Latin word for "place", "location") is a set of all points (commonly, a line, a line segment, a curve or a surface), whose location satisfies or is determined by one or more specified conditions.

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