Does someone know what is $K^{\frak s}$ here at the bottom of 2nd page? It is quite frequent in the text but I cannot locate the definition.
2026-03-27 00:01:42.1774569702
Shelah notation
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As mentioned in the text itself, it's an a.e.c. i.e. an abstract elementary class. (You should find this confirmed the third time that initialism is used.)