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{{infobox graph
| name = Frucht graph
| image = [[File:Frucht planar Lombardi.svg|200px]]
| image_caption = The Frucht graph
| namesake = Robert Frucht
| vertices = 12
| edges = 18
| automorphisms = 1 ({''id''})
| girth = 3
| radius = 3
| diameter = 4
| chromatic_number = 3
| chromatic_index = 3
| properties = [[Cubic graph|Cubic]]<br>[[Planar graph|Planar]]<br>[[Hamiltonian graph|Hamiltonian]]
}}
In the [[mathematics|mathematical]] field of [[graph theory]], the '''Frucht graph''' is a 3-[[regular graph]] with 12 vertices, 18 edges, and no nontrivial [[graph automorphism|symmetries]].<ref>{{MathWorld|urlname=FruchtGraph|title=Frucht Graph}}</ref> It was first described by [[Robert Frucht]] in 1939.<ref name="f38"/>


The Frucht graph is a [[Halin graph]] with [[chromatic number]] 3, [[chromatic index]] 3, radius 3, diameter 4 and [[Girth (graph theory)|girth]] 3. As with every Halin graph, the Frucht graph is [[planar graph|planar]], 3-[[k-vertex-connected graph|vertex-connected]], and [[polyhedral graph|polyhedral]]. It is also a 3-[[k-edge-connected graph|edge-connected graph]].  Its [[Glossary_of_graph_theory#Independence|independence number]] is 5.


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The Frucht graph is [[Hamiltonian graph|Hamiltonian]] and can be constructed from the [[LCF notation]]: [−5,−2,−4,2,5,−2,2,5,−2,−5,4,2].
 
==Algebraic properties==
The Frucht graph is one of the two smallest [[cubic graph]]s possessing only a single [[graph automorphism]], the identity<ref>Skiena, S. Implementing Discrete Mathematics: Combinatorics and Graph Theory with Mathematica. Reading, MA: Addison-Wesley, 1990</ref> (that is, every vertex can be distinguished topologically from every other vertex). Such graphs are called [[asymmetric graph|asymmetric]] (or identity) graphs. [[Frucht's theorem]] states that any [[group (mathematics)|group]] can be realized as the group of symmetries of a graph,<ref name="f38">{{Citation | last1=Frucht | first1=R. | title=Herstellung von Graphen mit vorgegebener abstrakter Gruppe. | url=http://www.numdam.org/item?id=CM_1939__6__239_0 | language=German | zbl=0020.07804 | year=1939 | journal=Compositio Mathematica | issn=0010-437X | volume=6 | pages=239–250}}.</ref> and a strengthening of this theorem also due to Frucht states that any group can be realized as the symmetries of a 3-regular graph;<ref>{{Citation | last1=Frucht | first1=R. | title=Graphs of degree three with a given abstract group | url=http://cms.math.ca/cjm/v1/p365 | doi = 10.4153/CJM-1949-033-6 | mr=0032987 | year=1949 | journal=[[Canadian Journal of Mathematics]] | issn=0008-414X | volume=1 | pages=365–378}}.</ref> the Frucht graph provides an example of this realization for the [[trivial group]].
 
The [[characteristic polynomial of a graph|characteristic polynomial]] of the Frucht graph is <math>(x-3) (x-2) x (x+1) (x+2) (x^3+x^2-2 x-1) (x^4+x^3-6 x^2-5 x+4)</math>.
 
==Gallery==
<gallery>
File:Frucht_graph_3COL.svg|The [[chromatic number]] of the Frucht graph is&nbsp;3.
File:Frucht Lombardi.svg| The Frucht graph is [[Hamiltonian graph|Hamiltonian]].
</gallery>
 
== See also ==
{{commonscat|Frucht graph}}
== References ==
{{reflist}}
 
[[Category:Individual graphs]]
[[Category:Regular graphs]]
[[Category:Planar graphs]]

Revision as of 21:04, 19 October 2013

Template:Infobox graph In the mathematical field of graph theory, the Frucht graph is a 3-regular graph with 12 vertices, 18 edges, and no nontrivial symmetries.[1] It was first described by Robert Frucht in 1939.[2]

The Frucht graph is a Halin graph with chromatic number 3, chromatic index 3, radius 3, diameter 4 and girth 3. As with every Halin graph, the Frucht graph is planar, 3-vertex-connected, and polyhedral. It is also a 3-edge-connected graph. Its independence number is 5.

The Frucht graph is Hamiltonian and can be constructed from the LCF notation: [−5,−2,−4,2,5,−2,2,5,−2,−5,4,2].

Algebraic properties

The Frucht graph is one of the two smallest cubic graphs possessing only a single graph automorphism, the identity[3] (that is, every vertex can be distinguished topologically from every other vertex). Such graphs are called asymmetric (or identity) graphs. Frucht's theorem states that any group can be realized as the group of symmetries of a graph,[2] and a strengthening of this theorem also due to Frucht states that any group can be realized as the symmetries of a 3-regular graph;[4] the Frucht graph provides an example of this realization for the trivial group.

The characteristic polynomial of the Frucht graph is (x3)(x2)x(x+1)(x+2)(x3+x22x1)(x4+x36x25x+4).

Gallery

See also

Template:Commonscat

References

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