Reduced 1-cohomology and relative property (T)
classification
🧮 math.GR
math.RT
keywords
propertycohomologyreducedfirstrelativecharacterizecharacterizedgroup
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Shalom characterized property (T) in terms of the vanishing of all reduced first cohomology. We characterize group pairs having the property that the restriction map on all first reduced cohomology vanishes. We show that, in a strong sense, this is inequivalent to relative property (T).
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