Length of Boolean algebras and ultraproducts

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We prove the consistency with ZFC of ``the length of an ultraproduct of Boolean algebras is smaller than the ultraproduct of the lengths''. Similarly for some other cardinal invariants of Boolean algebras.

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Logic, General Topology

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http://salesiana.dossiersoluciones.com/handle/123456789/76984

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/math/9805145
 http://arxiv.org/abs/math/9805145
 Math. Japon. 48 No. 2 (1998) 301--307

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arXiv