User Hannes Jakob - MathOverflow

Hannes Jakob

Member for 5 years
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8 Answers

Score Activity Newest

18 votes

Accepted

Changing the cofinality of a regular cardinal without collapsing any cardinals?

answered Feb 18 at 11:05

12 votes

Accepted

Can we force $\aleph_\omega^\omega<2^{\aleph_\omega}$?

answered Feb 1 at 13:17

7 votes

Accepted

Thick Canadian trees

answered Sep 7, 2023 at 6:31

3 votes

Stationary many subsets of $\kappa^+$ whose order type is a cardinal and whose intersection with $\kappa$ is an inaccessible cardinal

answered Feb 27 at 18:59

3 votes

Accepted

A nonprincipal ultrafilter that is not a $p$-point

answered Mar 18, 2020 at 9:39

1 vote

Lambda system generated by a non-atomic collection

answered Apr 5, 2020 at 20:10

1 vote

Accepted

Smallest size of a non-measurable set of reals

answered Jan 27, 2020 at 15:05

1 vote

Accepted

Are there forcing notions adding $\kappa$ random, sacks, prikry, or Mathias reals?

answered Mar 2, 2020 at 21:10