An explicit separable unital full group C∗-algebra admits no unital embedding into the norm ultrapower B^ω of any nonzero unital nuclear C∗-algebra B for any free ultrafilter ω on the natural numbers.
An explicit separable unital full group C∗-algebra admits no unital embedding into the norm ultrapower B^ω of any nonzero unital nuclear C∗-algebra B for any free ultrafilter ω on the natural numbers.
An explicit separable unital full group C∗-algebra admits no unital embedding into the norm ultrapower B^ω of any nonzero unital nuclear C∗-algebra B for any free ultrafilter ω on the natural numbers.
If correct, answers the norm-ultrapower embedding problem negatively with one algebra that works against every nuclear target.
Does every separable C∗-algebra embed into a nuclear norm ultrapower?
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OpenAI reports a nuclear norm-ultrapower embedding obstruction
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