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In mathematics and computational geometry, the Gabriel graph of a set
S
{\displaystyle S}
of points in the Euclidean plane expresses one notion of proximity or nearness of those points. Formally, it is the graph
G
{\displaystyle G}
with vertex set
S
{\displaystyle S}
in which any two distinct points
p
∈
S
{\displaystyle p\in S}
and
q
∈
S
{\displaystyle q\in S}
are adjacent precisely when the closed disc having
p
q
{\displaystyle pq}
as a diameter contains no other points. Another way of expressing the same adjacency criterion is that
p
{\displaystyle p}
and
q
{\displaystyle q}
should be the two closest given points to their midpoint, with no other given point being as close. Gabriel graphs naturally generalize to higher dimensions, with the empty disks replaced by empty closed balls. Gabriel graphs are named after K. Ruben Gabriel, who introduced them in a paper with Robert R. Sokal in 1969.
Percolation
For Gabriel graphs of infinite random point sets, the finite site percolation threshold gives the fraction of points needed to support connectivity: if a random subset of fewer vertices than the threshold is given, the remaining graph will almost surely have only finite connected components, while if the size of the random subset is more than the threshold, then the remaining graph will almost surely have an infinite component (as well as finite components). This threshold was proved to exist by Bertin, Billiot & Drouilhet (2002), and more precise values of both site and bond thresholds have been given by Norrenbrock.
Related geometric graphs
The Gabriel graph is a subgraph of the Delaunay triangulation. It can be found in linear time if the Delaunay triangulation is given.
The Gabriel graph contains, as subgraphs, the Euclidean minimum spanning tree, the relative neighborhood graph, and the nearest neighbor graph.
It is an instance of a beta-skeleton. Like beta-skeletons, and unlike Delaunay triangulations, it is not a geometric spanner: for some point sets, distances within the Gabriel graph can be much larger than the Euclidean distances between points.
References
Kata Kunci Pencarian:
Gabriel graph - Alchetron, The Free Social Encyclopedia
Gabriel graph - HandWiki
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Gabriel graph - Wikipedia
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Gabriel Graph rule | Download Scientific Diagram
Gabriel Graph rule | Download Scientific Diagram