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arborescences

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Definitions of arborescences in various dictionaries:

ARBORESCENCES - In graph theory, an arborescence is a directed graph in which, for a vertex u called the root and any other vertex v, there is exactly one directed p...

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Plural form of arborescence.

Arborescences description
In graph theory, an arborescence is a directed graph in which, for a vertex u called the root and any other vertex v, there is exactly one directed path from u to v. An arborescence is thus the directed-graph form of a rooted tree, understood here as an undirected graph.Equivalently, an arborescence is a directed, rooted tree in which all edges point away from the root; a number of other equivalent characterizations exist. Every arborescence is a directed acyclic graph (DAG), but not every DAG is an arborescence. * An arborescence can equivalently be defined as a rooted digraph in which the path from the root to any other vertex is unique.The term arborescence comes from French. Some authors object to it on grounds that it is cumbersome to spell. There is a large number of synonyms for arborescence in graph theory, including directed rooted tree out-arborescence, out-tree, and even branching being used to denote the same concept. Rooted tree itself has been defined by some authors as a directed graph.Furthermore, some authors define an arborescence to be a spanning directed tree of a given digraph. The same can be said about some its synonyms, especially branching. Other authors use branching to denote a forest of arborescences, with the latter notion defined in broader sense given at beginning of this article, but a variation with both notions of the spanning flavor is also encountered.It's also possible to define a useful notion by reversing all the arcs of an arborescence, i.e. making them all point to the root rather than away from it. Such digraphs are also designated by a variety of terms such as in-tree or anti-arborescence etc. W. T. Tutte distinguishes between the two cases by using the phrases arborescence diverging from [some root] and arborescence converging to [some root].The number of rooted trees (or arborescences) with n nodes is given by the sequence:* 0, 1, 1, 2, 4, 9, 20, 48, 115, 286, 719, 1842, 4766, 12486, ... (sequence A000081 in the OEIS).

Arborescences description

In graph theory, an arborescence is a directed graph in which, for a vertex u called the root and any other vertex v, there is exactly one directed path from u to v. An arborescence is thus the directed-graph form of a rooted tree, understood here as an undirected graph.Equivalently, an arborescence is a directed, rooted tree in which all edges point away from the root; a number of other equivalent characterizations exist. Every arborescence is a directed acyclic graph (DAG), but not every DAG is an arborescence.
* An arborescence can equivalently be defined as a rooted digraph in which the path from the root to any other vertex is unique.The term arborescence comes from French. Some authors object to it on grounds that it is cumbersome to spell. There is a large number of synonyms for arborescence in graph theory, including directed rooted tree out-arborescence, out-tree, and even branching being used to denote the same concept. Rooted tree itself has been defined by some authors as a directed graph.Furthermore, some authors define an arborescence to be a spanning directed tree of a given digraph. The same can be said about some its synonyms, especially branching. Other authors use branching to denote a forest of arborescences, with the latter notion defined in broader sense given at beginning of this article, but a variation with both notions of the spanning flavor is also encountered.It's also possible to define a useful notion by reversing all the arcs of an arborescence, i.e. making them all point to the root rather than away from it. Such digraphs are also designated by a variety of terms such as in-tree or anti-arborescence etc. W. T. Tutte distinguishes between the two cases by using the phrases arborescence diverging from [some root] and arborescence converging to [some root].The number of rooted trees (or arborescences) with n nodes is given by the sequence:* 0, 1, 1, 2, 4, 9, 20, 48, 115, 286, 719, 1842, 4766, 12486, ... (sequence A000081 in the OEIS).

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