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  2. Planar graph - Wikipedia

    en.wikipedia.org/wiki/Planar_graph

    A 1-planar graph is a graph that may be drawn in the plane with at most one simple crossing per edge, and a k-planar graph is a graph that may be drawn with at most k simple crossings per edge. A map graph is a graph formed from a set of finitely many simply-connected interior-disjoint regions in the plane by connecting two regions when they ...

  3. Dimension (graph theory) - Wikipedia

    en.wikipedia.org/wiki/Dimension_(graph_theory)

    For example, it takes two dimensions to immerse (an equilateral triangle), and three to immerse (a regular tetrahedron) as shown to the right. dim ⁡ K n = n − 1 {\displaystyle \dim K_{n}=n-1} In other words, the dimension of the complete graph is the same as that of the simplex having the same number of vertices.

  4. Euclidean plane - Wikipedia

    en.wikipedia.org/wiki/Euclidean_plane

    In graph theory, a planar graph is a graph that can be embedded in the plane, i.e., it can be drawn on the plane in such a way that its edges intersect only at their endpoints. In other words, it can be drawn in such a way that no edges cross each other. [9] Such a drawing is called a plane graph or planar embedding of the graph.

  5. Descriptive geometry - Wikipedia

    en.wikipedia.org/wiki/Descriptive_geometry

    Aside from the Orthographic, six standard principal views (Front; Right Side; Left Side; Top; Bottom; Rear), descriptive geometry strives to yield four basic solution views: the true length of a line (i.e., full size, not foreshortened), the point view (end view) of a line, the true shape of a plane (i.e., full size to scale, or not ...

  6. Euclidean planes in three-dimensional space - Wikipedia

    en.wikipedia.org/wiki/Euclidean_planes_in_three...

    This familiar equation for a plane is called the general form of the equation of the plane or just the plane equation. [6] Thus for example a regression equation of the form y = d + ax + cz (with b = −1) establishes a best-fit plane in three-dimensional space when there are two explanatory variables.

  7. 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.

  8. Plane curve - Wikipedia

    en.wikipedia.org/wiki/Plane_curve

    A smooth plane curve is a curve in a real Euclidean plane ⁠ ⁠ and is a one-dimensional smooth manifold.This means that a smooth plane curve is a plane curve which "locally looks like a line", in the sense that near every point, it may be mapped to a line by a smooth function.

  9. Regular map (graph theory) - Wikipedia

    en.wikipedia.org/wiki/Regular_map_(graph_theory)

    The hemi-dodecahedron is a regular map produced by pentagonal embedding of the Petersen graph in the projective plane. The p-hosohedron is a regular map of type {2,p}. The Dyck map is a regular map of 12 octagons on a genus-3 surface. Its underlying graph, the Dyck graph, can also form a regular map of 16 hexagons in a torus. The following is a ...

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