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Level structure - Wikipedia, the free encyclopedia

Level structure

From Wikipedia, the free encyclopedia

In the mathematical subfield of graph theory a level structure of a graph is a partition of the set of vertices into equivalence classes of vertices with the same distance from a given root vertex.

[edit] Definition

Given a connected graph G=(V,E) with V the set of vertices and E the set of edges with

$\epsilon:V \to \mathbb{N}$

the eccentricity of a vertex, for a given vertex v

The partition

$V = \bigcup_{i=0}^{\epsilon(v)} L_i(v)=V$

with

L 0 (v): = v

$L_i(v):=\mathrm{Adj}(L_{i-1}(x)) \setminus \bigcup_{j=0}^{i-1} L_j(x) \qquad \mbox{ , } i=1,2,\ldots \epsilon(v)$

is called a level structure of G with root v and depth ε(v).

Retrieved from "http://en.wikipedia.org../../../l/e/v/Level_structure.html"

Category: Graph theory

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