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Bédos, Erik (author), Enstad, Ulrik (author), van Velthoven, J.T. (author)This paper provides sufficient density conditions for the existence of smooth vectors generating a frame or Riesz sequence in the lattice orbit of a square-integrable projective representation of a nilpotent Lie group. The conditions involve the product of lattice co-volume and formal dimension, and complement Balian–Low type theorems for the...journal article 2022