Sub-Riemannian manifolds with full-support measures are never CD(K,N) unless Riemannian, and new cone-Grushin RCD spaces on R^n are constructed that are not sub-Riemannian.
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Universal non-CD of sub-Riemannian manifolds
Sub-Riemannian manifolds with full-support measures are never CD(K,N) unless Riemannian, and new cone-Grushin RCD spaces on R^n are constructed that are not sub-Riemannian.