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Hannes Jakob's user avatar
Hannes Jakob's user avatar
Hannes Jakob's user avatar
Hannes Jakob
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PhD Student in Freiburg, working in Set Theory.

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answer
18
Changing the cofinality of a regular cardinal without collapsing any cardinals?
Feb 18
answer
12
Can we force $\aleph_\omega^\omega<2^{\aleph_\omega}$?
Feb 1
question
8
Relationship between AC, WO, and Zorn's lemma in ZF-Powerset
Apr 26, 2019
question
7
Are generic filters that produce the same forcing extension related by a ground-model automorphism?
Jan 27, 2021
question
7
Dedekind-"finiteness" for arbitrary limit cardinals
Jun 10, 2021
question
7
Proof (or reference) about the cc-ness of termspace forcing
Feb 25, 2023
answer
7
Thick Canadian trees
Sep 7, 2023
question
6
Are the following two "tree properties" equivalent?
Nov 16, 2021
question
6
What is known about the least cardinal where $\kappa$ fails to be supercompact?
Jan 17, 2022
question
6
An iteration of proper forcing without proper iterands
Mar 15