Reflection principles for ω<sub>2</sub> and the semi-stationary reflection principle

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  • Reflection principles for ω₂ and the semi-stationary reflection principle
  • Reflection principles for $\omega_2$ and the semi-stationary reflection principle

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<p>Starting from a model with a weakly compact cardinal, we construct a model in which the weak stationary reflection principle for ω2 holds but the Fodor-type reflection principle for ω2 fails. So the stationary reflection principle for ω2 fails in this model. We also construct a model in which the semi-stationary reflection principle holds but the Fodor-type reflection principle for ω2 fails.</p>

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