A counterexample to Haagerup's problem on subadditive weights
Ikhan Choi, Sunghyeon Jo
math.OAarXiv:2608.23896
Abstract
We construct a subadditive weight on the type I∞ factor that preserves directed suprema but is not σ-weakly lower semi-continuous. This provides a counterexample to Haagerup's first problem posed in 1975.
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