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No minimal tall Borel ideal in the Katětov order

Volume 248 / 2020

Jan Grebík, Michael Hrušák Fundamenta Mathematicae 248 (2020), 135-145 MSC: 03E05, 03E15, 03E17. DOI: 10.4064/fm724-4-2019 Published online: 5 September 2019

Abstract

Answering a question of the second listed author we show that there is no tall Borel ideal minimal among all tall Borel ideals in the Katětov order.

Authors

  • Jan GrebíkInstitute of Mathematics
    Academy of Sciences of the Czech Republic
    Žitná 609/25
    110 00 Praha 1-Nové Město
    Czech Republic
    e-mail
  • Michael HrušákCentro de Ciencias Matemáticas
    UNAM
    A.P. 61-3, Xangari
    Morelia, Michoacán 58089, Mexico
    e-mail

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