I guess $kG$ is the group algebra over a finite group, i.e. the set of linear combinations of $k$ and group elements. But I do not understand the "$^\times$".
Thank you.
2026-03-26 12:40:40.1774528840
Simple notation question: What does $(kG)^\times$ mean? $k$ is a field and $G$ is a group
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Most likely this is $(kG)^{\times}$, which denotes the unit group of the group ring (or algebra) $kG$.