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

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 202^{\aleph_0} when

dens(A)>20.\operatorname{dens}(A)>2^{\aleph_0}.

Forcing obstruction conjecture. The poset EA\mathbb{E}_A forces that AA does not embed into /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.

Sources & referencesView supporting material

Primary source

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

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