Hiroto Nishikawa

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math.OA2026

Embeddings of matrix algebras into the universal Roe algebra

Hiroto Nishikawa

V. Manuilov introduced the universal Roe algebra, namely the uniform Roe algebra associated with the largest uniformly locally finite coarse structure $Univ$ on $\mathbb{N…

math.OA2024

$C^{*}$ -exactness and property A for group actions

Hiroto Nishikawa

For an action of a discrete group $Γ$ on a set $X$ , we show that the Schreier graph on $X$ has property A if and only if the permutation representation on $ℓ_{2} X$ generates an ex…

Embeddings of matrix algebras into the universal Roe algebra

C∗-exactness and property A for group actions

$C^{*}$ -exactness and property A for group actions