Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5771700 | Journal of Algebra | 2017 | 29 Pages |
Abstract
Let X be a coherent configuration associated with a transitive group G. In terms of the intersection numbers of X, a necessary condition for the point stabilizer of G to be a TI-subgroup, is established. Furthermore, under this condition, X is determined up to isomorphism by the intersection numbers. It is also proved that asymptotically, this condition is also sufficient. More precisely, an arbitrary homogeneous coherent configuration satisfying this condition is associated with a transitive group, the point stabilizer of which is a TI-subgroup. As a byproduct of the developed theory, recent results on pseudocyclic and quasi-thin association schemes are generalized and improved. In particular, it is shown that any scheme of prime degree p and valency k is associated with a transitive group, whenever p>1+6k(kâ1)2.
Related Topics
Physical Sciences and Engineering
Mathematics
Algebra and Number Theory
Authors
Gang Chen, Ilia Ponomarenko,