Abstract
We have seen that, if a locally compact group G contains a closed noncom-pact subgroup H such that the pair (G, H) has relative property (T), then G may not have the Haagerup property. Hence we may ask whether relative property (T) (with respect to a noncompact subgroup) is the only obstruction to the Haagerup property. It was proved in Theorem 4.0.1 that the answer is positive for connected Lie groups1.
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