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A vertex of an angle is the endpoint where two lines or rays come together. In geometry, a vertex (pl.: vertices or vertexes) is a point where two or more curves, lines, or edges meet or intersect. As a consequence of this definition, the point where two lines meet to form an angle and the corners of polygons and polyhedra are vertices. [1] [2] [3]
Streinu & Whiteley (2005) provide an application of this result to the mathematics of paper folding: they describe how to fold any single-vertex origami shape using only simple non-self-intersecting motions of the paper. Essentially, this folding process is a time-reversed version of the problem of convexifying a polygon of length smaller than ...
A graph with three vertices and three edges. A graph (sometimes called an undirected graph to distinguish it from a directed graph, or a simple graph to distinguish it from a multigraph) [4] [5] is a pair G = (V, E), where V is a set whose elements are called vertices (singular: vertex), and E is a set of unordered pairs {,} of vertices, whose elements are called edges (sometimes links or lines).
The degree or valency of a vertex is the number of edges that are incident to it, where a loop is counted twice. The degree of a graph is the maximum of the degrees of its vertices. In an undirected simple graph of order n, the maximum degree of each vertex is n − 1 and the maximum size of the graph is n(n − 1) / 2 .
A quick glance into the world of modern triangle geometry as it existed during the peak of interest in triangle geometry subsequent to the publication of Lemoine's paper is presented below. This presentation is largely based on the topics discussed in William Gallatly's book [13] published in 1910 and Roger A Johnsons' book [14] first published ...
The poles were introduced in 1998 in two papers by Nina Amenta, Marshall Bern, and Manolis Kellis, for the problem of surface reconstruction.As they showed, any smooth surface that is sampled with sampling density inversely proportional to its curvature can be accurately reconstructed, by constructing the Delaunay triangulation of the combined set of sample points and their poles, and then ...
A one-vertex crease pattern consists of a set of rays or creases drawn on a flat sheet of paper, all emanating from the same point interior to the sheet. (This point is called the vertex of the pattern.) Each crease must be folded, but the pattern does not specify whether the folds should be mountain folds or valley folds. The goal is to ...
The vertex figures for the six tilings with convex regular polygon and apeirogon faces. (The Wythoff symbol is given in red.) Vertex figures for 21 uniform tilings. There are several ways the list of uniform tilings can be expanded: Vertex figures can have retrograde faces and turn around the vertex more than once. Star polygon tiles can be ...
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