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3. The Tree Property


    1. Add remark

      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.