Characterization of Balanced Coherent Configurations

Details Characterization of Balanced Coherent Configurations Characterization of Balanced Coherent Configurations

2010-02-03

arxiv.org/abs/1002.0628v1

J. Algebra (2010), doi:10.1016/j.jalgebra.2010.05.015

Mathematics

Combinatorics

Scientific paper

10.1016/j.jalgebra.2010.05.015.

Let $G$ be a group acting on a finite set $\Omega$. Then $G$ acts on $\Omega\times \Omega$ by its entry-wise action and its orbits form the basis relations of a coherent configuration (or shortly scheme). Our concern is to consider what follows from the assumption that the number of orbits of $G$ on $\Omega_i\times \Omega_j$ is constant whenever $\Omega_i$ and $\Omega_j$ are orbits of $G$ on $\Omega$. One can conclude from the assumption that the actions of $G$ on ${\Omega_i}$'s have the same permutation character and are not necessarily equivalent. From this viewpoint one may ask how many inequivalent actions of a given group with the same permutation character there exist. In this article we will approach to this question by a purely combinatorial method in terms of schemes and investigate the following topics: (i) balanced schemes and their central primitive idempotents, (ii) characterization of reduced balanced schemes.

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