Authors: Todorčević, Stevo 
Xiong, Shihao
Affiliations: Mathematics 
Mathematical Institute of the Serbian Academy of Sciences and Arts 
Title: Limits on forcing axioms at ω2 compatible with the continuum hypothesis
Journal: Archive for Mathematical Logic
Volume: 65
First page: 411
Last page: 423
Issue Date: 2026
Rank: M23
ISSN: 0933-5846
DOI: 10.1007/s00153-025-01003-1
Abstract: 
We show that the forcing axiom for countably compact, ω2-Knaster, well-met posets is inconsistent. This is supplemental to an inconsistency result of Shelah [9] and sets a new limit to the generalization of Martin’s Axiom to the stage of ω2.
Keywords: Forcing axioms | Walks on Ordinals
Publisher: Springer Link

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