Cartesian symmetry classes associated with certain subgroups of $S_m$

Abstract

In this paper, the problem existing $O$-basis for Cartesian symmetry classes is discussed. The dimensions of Cartesian symmetry classes associated with a cyclic subgroup of the symmetric group $S_m$ (generated by a product of disjoint cycles) and the product of cyclic subgroups of $S_m$ are explicitly expressed in terms of the Ramanajun sum. Additionally, a necessary and sufficient condition for the existence of an $O$-basis for Cartesian symmetry classes associated with the irreducible characters of dihedral group is given. The dimensions of these classes are also computed.

Keywords

• irreducible characters
• cartesian symmetry classes
• orthogonal basis
• cyclic group
• dihedral group
• ramanujan sum