Joanna Ko

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20212026

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math.CT2022

Existence of groupoid models for diagrams of groupoid correspondences

Joanna Ko, Ralf Meyer

This article continues the study of diagrams in the bicategory of étale groupoid correspondences. We prove that any such diagram has a groupoid model and that the groupoid model is…

math.OA2022

Monadic forgetful functors and (non-)presentability for $C^{}$ - and $W^{}$ -algebras

Alexandru Chirvasitu, Joanna Ko

We prove that the forgetful functors from the categories of $C^{*}$ - and $W^{*}$ -algebras to Banach $*$ -algebras, Banach algebras or Banach spaces are all monadic, answering a question…

Existence of groupoid models for diagrams of groupoid correspondences

Monadic forgetful functors and (non-)presentability for C∗- and W∗-algebras

Monadic forgetful functors and (non-)presentability for $C^{}$ - and $W^{}$ -algebras