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Jason Zesheng Chen's user avatar
Jason Zesheng Chen's user avatar
Jason Zesheng Chen's user avatar
Jason Zesheng Chen
  • Member for 5 years, 11 months
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answer
10
If the axiom of replacement implies the axiom of specification, why are both mentioned
Jan 10, 2022
question
8
Characterizing worldly cardinals as the supremum (by n) of least $\Sigma_n$-extendible cardinals
Sep 9, 2020
question
7
Is Fodor's Lemma necessary for the $\omega_1$ train station puzzle?
Jul 7, 2020
question
5
Rank of element in generic extension versus rank of its name
Dec 4, 2020
answer
4
Exercise 15.15 of Jech: forcing GCH
Jan 24, 2021
answer
4
Chain of elementary submodels of $L_{\omega_2}$
Jan 24, 2021
answer
4
Can someone tell me where in my "proof" that ZF is inconsistent I went wrong?
Jul 19, 2021
answer
4
Absoluteness of complexity of sets of reals
Oct 4, 2021
answer
4
Is there a well-ordering of the reals whose initial segments are all measurable?
Dec 10, 2023
question
3
Amenable structures and $\Sigma_0$-preserving cofinal embedding
Mar 2, 2020
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17
May two Cohen reals collapse cardinals?
8
Analogues of worldly cardinals for (an unusual version of) second-order $\mathsf{ZFC}$
8
Examples of ZFC theorems proved via forcing
7
Theorems in set theory that use computability theory tools, and vice versa
6
Which step is wrong in the following simplification of Silver's forcing?