OpenAI reports a ZFC counterexample to Naimark’s problem

In ZFC there exists a unital infinite-dimensional simple complex C∗-algebra with a faithful tracial state whose nonzero irreducible representations are all unitarily equivalent, yet it is not an algebra of compact operators.

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Understanding the problem

Read the background

In ZFC there exists a unital infinite-dimensional simple complex C∗-algebra with a faithful tracial state whose nonzero irreducible representations are all unitarily equivalent, yet it is not an algebra of compact operators.

Why it matters

If correct, answers Naimark’s problem negatively without any additional set-theoretic assumption.

What counts as progress

Does Naimark’s characterization fail in ZFC?

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