Orders of Indescribable Sets
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- Hellsten, A. Arch. Math. Logic (2006) 45: 705. doi:10.1007/s00153-006-0015-1
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We extract some properties of Mahlo’s operation and show that some other very natural operations share these properties. The weakly compact sets form a similar hierarchy as the stationary sets. The height of this hierarchy is a large cardinal property connected to saturation properties of the weakly compact ideal.