Diameter (group theory)
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Wikipedia : http://en.wikipedia.org/wiki/Diameter_(group_theory)In the area of abstract algebra known as group theory, the diameter of a finite group is a measure of its complexity.
Consider a finite group , and any set of generators S. Define to be the graph diameter of the Cayley graph . Then the diameter of is the largest value of taken over all generating sets S.
For instance, every finite cyclic group of order s, the Cayley graph for a generating set with one generator is an s-vertex cycle graph. The diameter of this graph, and of the group, is .^{[1]}
It is conjectured, for all non-abelian finite simple groups G, that^{[2]}
Many partial results are known but the full conjecture remains open.^{[3]}
References
- ^ Babai, László; Seress, Ákos (1992), "On the diameter of permutation groups", European Journal of Combinatorics, 13 (4): 231–243, doi:10.1016/S0195-6698(05)80029-0, MR 1179520.
- ^ Babai & Seress (1992), Conj. 1.7. This conjecture is misquoted by Helfgott & Seress (2014), who omit the non-abelian qualifier.
- ^ Helfgott, Harald A.; Seress, Ákos (2014), "On the diameter of permutation groups", Annals of Mathematics, Second Series, 179 (2): 611–658, arXiv:1109.3550 , doi:10.4007/annals.2014.179.2.4, MR 3152942.
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