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WEAK REFLECTION PRINCIPLE, SATURATION OF THE NONSTATIONARY IDEAL ON ω1 AND DIAMONDS

Published online by Cambridge University Press:  19 June 2017

VÍCTOR TORRES-PÉREZ
VÍCTOR TORRES-PÉREZ*
Affiliation:
INSTITUT FÜR DISKRETE MATHEMATIK UND GEOMETRIE, TU WIEN WIEDNER HAUPSTRASSE 8/104 1040 VIENNA, AUSTRIAE-mail: [email protected]
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Abstract

We prove that WRP and saturation of the ideal NSω1 together imply $\left\{ {a \in [\lambda ]^{\omega _1 } :{\text{cof}}\left( {{\text{sup}}\left( a \right)} \right) = \omega _1 } \right\}$, for every cardinal λ with cof(λ) ≥ω2 .

Keywords

03E0503E1003E65Weak Reflection Principlesaturation of idealsdiamond principlescardinal arithmetic
Type
Articles
Information
The Journal of Symbolic Logic , Volume 82 , Issue 2 , June 2017 , pp. 724 - 736
Copyright
Copyright © The Association for Symbolic Logic 2017 

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