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We organised thèYoung Researchers in Set Theory' meeting to give talented young researchers in set theory the opportunity to learn from experts and from each other in a friendly cooperative environment. We used the term`young' to mean a PhD student or a post-doc (i.e., someone without a permanent position) and the term`senior' for a researcher with a(More)
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. 1 2
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