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Popa–Vaes unique Cartan conjecture for group measure space factors
Let $\Gamma$ be a nonamenable countable group with positive first $\ell^2$ -Betti number, $\beta^{_{(2)}}_{_1}(\Gamma)>0$ , and let $\Gamma\curvearrowright X$ be a free ergodic p.m.p…
Conjectureopengroup-measure-space-factors l2-betti-numbers operator-algebrasarXiv posted 2 days ago

Popa–Vaes unique Cartan conjecture for group measure space factors