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USUBA’S PRINCIPLE $\mathrm {UB}_\lambda $ CAN FAIL AT SINGULAR CARDINALS
Part of:
Set theory
Published online by Cambridge University Press: 07 September 2023
Abstract
We answer a question of Usuba by showing that the combinatorial principle $\mathrm {UB}_\lambda $ can fail at a singular cardinal. Furthermore, $\lambda $ can be taken to be $\aleph _\omega .$
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- © The Author(s), 2023. Published by Cambridge University Press on behalf of The Association for Symbolic Logic
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