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Bichon, Julien; Kyed, David; Raum, Sven
 Higher $\ell^2$-Betti numbers of universal quantum groups We calculate all $\ell^2$-Betti numbers of the universal discrete Kac quantum groups $\hat{\mathrm U}^+_n$ as well as their half-liberated counterparts $\hat{\mathrm U}^*_n$. Keywords:$\ell^2$-Betti number, free unitary quantum group, half-liberated unitary quantum group, free product formula, extensionCategories:16T05, 46L65, 20G42
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