MathSciNet bibliographic data MR2661553 (2012b:46127) 46L10 (46L37 46L40) Popa, Sorin On spectral gap rigidity and Connes invariant $\chi(M)$$\chi(M)$. Proc. Amer. Math. Soc. 138 (2010), no. 10, 3531–3539. Article

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