Mathematics – Logic
Scientific paper
1994-09-02
Mathematics
Logic
Scientific paper
We study projective stationary sets. The Projective Stationary Reflection principle is the statement that every projective stationary set contains an increasing continuous $\in$--chain of length $\omega_1$. We show that if Martin's Maximum holds, then the Projective Stationary Reflection Principle holds. Also it is equivalent to the Strong Reflection Principle. We show that the saturation of the nonstationary ideal on $\omega_1$ is equivalent to a certain kind of reflection.
Feng Qi
Jech Thomas
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