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Limit Theorems for Associated Whitney Numbers of Dowling Lattices

Lane Clark1
1Departinent. of Mathematics Southern [Mlinois University Carboudale Carbondale, {L 62901

Abstract

The Whitney number Wm(n,k) of the rank-n Dowling lattice Qn(G) based on the group G having order m is the number of elements in Qn(G) of co-rank k. The associated numbers Um(n,k)=k!Wm(n,k) and Vm(n,k)=k!mkWm(n,k) were studied by M. Benoumhani [\emph{Adv. in Appl. Math}. 19 (1997), no. 1, 106-116] where a generating function was derived using algebraic techniques and logconcavity was shown for {Um(n,k)} and for {Vm(n,k)}. We give a central limit theorem and a local limit theorem on R for {Um(n,k)} and for {Vm(n,k)}. In addition, asymptotic formulas for maxkUm(n,k), maxkVm(n,k) and their modes are given.

Keywords: Central limit theorem: Local limit: theorem: Asymptotic formulas