The forcing obstruction to embedding large abelian C*-algebras into the reduced product

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Let AA be an abelian and nonseparable C∗\mathrm{C}^*-algebra, and let EA\mathbb{E}_A be the forcing notion associated with AA. The density character of AA is greater than 2ℵ02^{\aleph_0} when

dens⁡(A)>2ℵ0.\operatorname{dens}(A)>2^{\aleph_0}.

Forcing obstruction conjecture. The poset EA\mathbb{E}_A forces that AA does not embed into ℓ∞/c0\ell_\infty/c_0.

This is proposed as a step toward understanding when C*-algebras can be gently placed into the Calkin algebra. The supplied text gives no evidence that the claim has been resolved.

References

Primary source

Ilijas Farah, Georgios Katsimpas and Andrea Vaccaro, “Embedding C^*-algebras into the Calkin algebra”, arXiv:1810.00255 (2019).

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