Christopher Schafhauser

activity

20242026

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3 papers · 1 filter

math.OA2026

Nuclear C*-algebras: 99 problems

Christopher Schafhauser, Aaron Tikuisis, Stuart White

We present a collection of questions related to the structure and classification of nuclear C*-algebras.

math.OA2025

Negative resolution to the $C^{*}$ -algebraic Tarski problem

Srivatsav Kunnawalkam Elayavalli, Christopher Schafhauser

We compute the $K_{1}$ -group of ultraproducts of unital, simple $C^{*}$ -algebras with unique trace and strict comparison. As an application, we prove that the reduced free group $C^{*}$ -…

math.OA2024

A topology on E-theory

For separable $C^{*}$ -algebras $A$ and $B$ , we define a topology on the set $[[A, B]]$ consisting of homotopy classes of asymptotic morphisms from $A$ to $B$ . This gives an enrichmen…

Nuclear C*-algebras: 99 problems

Negative resolution to the C∗-algebraic Tarski problem

A topology on E-theory

Negative resolution to the $C^{*}$ -algebraic Tarski problem