Let G/K be an irreducible Riemannian symmetric space of the non-compact type and denote by Ξ the associated crown domain. We show that for any proper action of a cyclic group Γ the quotient Ξ/Γ is Stein. An analogous statement holds true for discrete nilpotent subgroups of a maximal split-solvable subgroup of G. We also show that Ξ is taut.
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