$\sigma$-entangled linear orders and narrowness of products of Boolean algebras

by Shelah. [Sh:462]
Fundamenta Math, 1997
We investigate sigma-entangled linear orders and narrowness of Boolean algebras. We show existence of sigma-entangled linear orders in many cardinals, and we build Boolean algebras with neither large chains nor large pies. We study the behavior of these notions in ultraproducts.

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