2020 Volume 72 Issue 3 Pages 909-921
Relying on the main results of [GT], we classify all unitary 𝑡-groups for 𝑡 ≥ 2 in any dimension 𝑑 ≥ 2. We also show that there is essentially a unique unitary 4-group, which is also a unitary 5-group, but not a unitary 𝑡-group for any 𝑡 ≥ 6.
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