Same Hall-Senior genus not implies character table-equivalent
This article gives the statement and possibly, proof, of a non-implication relation between two group properties. That is, it states that every group satisfying the first group property (i.e., groups having the same Hall-Senior genus) need not satisfy the second group property (i.e., character table-equivalent groups)
View a complete list of group property non-implications | View a complete list of group property implications
Get more facts about groups having the same Hall-Senior genus|Get more facts about character table-equivalent groups
Statement
It is possible to have two finite groups and such that:
- and are groups having the same Hall-Senior genus.
- and are not character table-equivalent groups, in fact, we can arrange our example so that the field generated by character values is different for and .
Proof
The smallest example occurs with the three maximal class groups of order 16: dihedral group:D16, semidihedral group:SD16, and generalized quaternion group:Q16. It turns out that and are character table-equivalent, but is not character table-equivalent to either. The field generated by character values for the three groups are described below:
| Group | Field generated by character values | Information on linear representation theory |
|---|---|---|
| dihedral group:D16 | linear representation theory of dihedral group:D16 | |
| semidihedral group:SD16 | linear representation theory of semidihedral group:SD16 | |
| generalized quaternion group:Q16 | linear representation theory of generalized quaternion group:Q16 |