Abstract
Starting from a model with a weakly compact cardinal, we construct a model in which the weak stationary reflection principle for $\omega_2$ holds but the Fodor-type reflection principle for $\omega_2$ fails. So the stationary reflection principle for $\omega_2$ fails in this model. We also construct a model in which the semi-stationary reflection principle holds but the Fodor-type reflection principle for $\omega_2$ fails.
Citation
Toshimichi USUBA. "Reflection principles for $\omega_2$ and the semi-stationary reflection principle." J. Math. Soc. Japan 68 (3) 1081 - 1098, July, 2016. https://doi.org/10.2969/jmsj/06831081
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