Mathematics > Operator Algebras
arXiv:2602.06877 (math)
[Submitted on 6 Feb 2026 (v1), last revised 16 Jun 2026 (this version, v3)]
Abstract:We give an example of a unital C*-algebra $\mathbf{A}$ with a computable presentation and for which neither $K_0(\mathbf{A})$ nor $K_1(\mathbf{A})$ has a computable presentation.
Submission history
From: Isaac Goldbring [view email]
[v1]
Fri, 6 Feb 2026 17:02:56 UTC (7 KB)
[v2]
Tue, 17 Feb 2026 18:20:08 UTC (9 KB)
[v3]
Tue, 16 Jun 2026 20:42:41 UTC (9 KB)
Bibliographic Tools
Bibliographic and Citation Tools
Bibliographic Explorer Toggle
Code, Data, Media
Code, Data and Media Associated with this Article
Demos
Demos
Related Papers
Recommenders and Search Tools
About arXivLabs
arXivLabs: experimental projects with community collaborators
arXivLabs is a framework that allows collaborators to develop and share new arXiv features directly on our website.
Both individuals and organizations that work with arXivLabs have embraced and accepted our values of openness, community, excellence, and user data privacy. arXiv is committed to these values and only works with partners that adhere to them.
Have an idea for a project that will add value for arXiv's community? Learn more about arXivLabs.













