. _:b6297392 "1996, Barry Simon, Representations of Finite and Compact Groups, page 50:"@en . _:b6297392 . "1" . _:b6297391 . _:b6297392 "The interesting aspect here is that U3 is irreducible, even though all irreps over the complexes are one-dimensional because \u21244 is abelian."@en . _:b6297391 "(mathematics) Of an algebraic structure, having a commutative defining operation. [Mid 19th century.]"@en .