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arxiv: 1807.06790 · v2 · pith:DSZXVZOCnew · submitted 2018-07-18 · 🧮 math.GR · math.AT· math.FA

Non p-norm approximated Groups

classification 🧮 math.GR math.ATmath.FA
keywords approximatedgroupsthomalmost-homomorphismsandreasasksauthorcannot
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It was shown in a previous work of the first named author with De Chiffre, Glebsky and Thom that there exists a finitely presented group which cannot be approximated by almost-homomorphisms to the unitary groups $U(n)$ equipped with the Frobenius norms (a.k.a as $L^2$ norm, or the Schatten-2-norm). In his ICM18 lecture, Andreas Thom asks if this result can be extended to general Schatten-p-norms. We show that this is indeed the case for $1<p< \infty$.

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