Is there a strict subalgebra of the hyperfinite $II_1$ factor that is separable and type $II_1$ factor?
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Denote the hyperfinite $\mathrm{II}_1$ factor by $R$. Then $R$ is isomorphic to $R \bar{\otimes} R$. So if you fix an isomorphism $\pi: R \bar{\otimes} R \rightarrow R$, then $\pi(R \otimes \mathbb{C})$ would satisfy your requirement.
David Gao
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