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math.OA2026
An Approximate-Diagonal Characterization of Amenable Actions on C*Algebras
Zhengyu Fu
We introduce relative -diagonals for crossed products by discrete groups, which are positive-form approximate diagonals in the Haagerup tensor product taken relati…
math.OA2025
Ultraproducts of crossed product C*algebras
Zhengyu Fu
We study the relationship between the ultraproduct of a crossed product C*algebra and the crossed product of an ultraproduct C*algebra for a…