On a theorem of Shapiro

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We show that a theorem of Leonid B. Shapiro which was proved under MA, is actually independent from ZFC. We also give a direct proof of the Boolean algebra version of the theorem under MA(Cohen).

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Logic

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http://salesiana.dossiersoluciones.com/handle/123456789/152909

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/math/9405215
 http://arxiv.org/abs/math/9405215
 Math. Japon. 40 (1994), 199--206

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arXiv