The reduced-product rigidity conjecture for II1_1-factors

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Assume OCA∞+MAℵ1\mathrm{OCA}_\infty+\mathrm{MA}_{\aleph_1}. Let (Mi)(M_i) and (Ni)(N_i) be sequences of separably representable type II1_1 factors, and let ⨁τMi\bigoplus_\tau M_i be the ideal of sequences whose normalized traces tend to zero, with analogous notation for (Ni)(N_i). Reduced-product rigidity conjecture for II1_1-factors.

∏Mi/⨁τMi≅∏Ni/⨁τNi\prod M_i/\bigoplus_\tau M_i\cong\prod N_i/\bigoplus_\tau N_i

if and only if there are finite sets F0,F1⊆NF_0,F_1\subseteq\mathbb N and a bijection

g ⁣:N∖F0→N∖F1g\colon\mathbb N\setminus F_0\to\mathbb N\setminus F_1

such that Mi≅Ng(i)M_i\cong N_{g(i)}. The conjecture proposes that, under these forcing axioms, an isomorphism between reduced products is determined by matching all but finitely many factor algebras. The source presents it as an analogy with its preceding rigidity results and gives no resolution here.

References

Primary source

Paul McKenney and Alessandro Vignati, “Forcing axioms and coronas of C^*-algebras”, arXiv:1806.09676 (2021).

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