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3. The Tree Property


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      Problem 3.35.

      [Unger] Suppose \kappa is singular with cofinality \omega_1. Let \lambda=\kappa^+. Must \square_{\omega_1}^* hold in a forcing extension where \lambda is \aleph_2?

          Cite this as: AimPL: From ℵ2 to infinity, available at http://aimpl.org/alephtwo.