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Normal Supercharacter Theory

Abstract

There are two main constructions of supercharacter theories for a group G G . The first, defined by Diaconis and Isaacs, comes from the action of a group AA via automorphisms on our given group GG. The second, defined by Hendrickson, is combining a supercharacter theories of a normal subgroup NN of GG with a supercharacter theory of G/NG/N. In this paper we construct a supercharacter theory from an arbitrary set of normal subgroups of GG. We show that when consider the set of all normal subgroups of G, the corresponding supercharacter theory is related to a partition of GG given by certain values on the central idempotents. Also, we show the supercharacter theories that we construct can not be obtained via automorphisms or a single normal subgroup.Comment: 12 page

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