Jason Chen
@jason-z-chen.bsky.social
Knows a bit about the history, philosophy, and practices of mathematics, especially set theory.
https://jasonzeshengchen.github.io/
https://jasonzeshengchen.github.io/
Pinned
Jason Chen
@jason-z-chen.bsky.social
· Sep 18
Recently I've had the pleasure of being interviewed on the blog of the American Philosophical Association. You can read the whole thing here: blog.apaonline.org/2025/09/12/a...
You don't have to read the whole thing of course, but please enjoy the two snippets that I'm pretty proud of ;)
You don't have to read the whole thing of course, but please enjoy the two snippets that I'm pretty proud of ;)
Reposted by Jason Chen
Vincenzo Dimonte, Luca Motto Ros
Generalized Descriptive Set Theory at Singular Cardinals of Countable Cofinality
https://arxiv.org/abs/2511.16188
Generalized Descriptive Set Theory at Singular Cardinals of Countable Cofinality
https://arxiv.org/abs/2511.16188
November 21, 2025 at 5:49 AM
Vincenzo Dimonte, Luca Motto Ros
Generalized Descriptive Set Theory at Singular Cardinals of Countable Cofinality
https://arxiv.org/abs/2511.16188
Generalized Descriptive Set Theory at Singular Cardinals of Countable Cofinality
https://arxiv.org/abs/2511.16188
Recently I've had the pleasure of being interviewed on the blog of the American Philosophical Association. You can read the whole thing here: blog.apaonline.org/2025/09/12/a...
You don't have to read the whole thing of course, but please enjoy the two snippets that I'm pretty proud of ;)
You don't have to read the whole thing of course, but please enjoy the two snippets that I'm pretty proud of ;)
September 18, 2025 at 5:23 PM
Recently I've had the pleasure of being interviewed on the blog of the American Philosophical Association. You can read the whole thing here: blog.apaonline.org/2025/09/12/a...
You don't have to read the whole thing of course, but please enjoy the two snippets that I'm pretty proud of ;)
You don't have to read the whole thing of course, but please enjoy the two snippets that I'm pretty proud of ;)
Reposted by Jason Chen
Ever dream of telling off your reviewers? One philosopher wrote up his version of doing so, and got it published...
Peer Review, Intellectual Tastes, and Some Fun - Daily Nous
Have you ever wanted to tell off the reviewers of your manuscript? One philosopher imagined doing that, wrote it up, and got it published in a peer-reviewed journal. To the referees, he says: I ask yo...
dailynous.com
September 5, 2025 at 6:05 PM
Ever dream of telling off your reviewers? One philosopher wrote up his version of doing so, and got it published...
Reposted by Jason Chen
I think this is quite interesting.
Still not really sure what to make of the imo surprising results.
Huge thanks to Gabe Goldberg and Pen Maddy for quite different forms of generous assistance.
Still not really sure what to make of the imo surprising results.
Huge thanks to Gabe Goldberg and Pen Maddy for quite different forms of generous assistance.
Toby Meadows: Internal Categoricity and the Generic Multiverse https://arxiv.org/abs/2508.21202 https://arxiv.org/pdf/2508.21202 https://arxiv.org/html/2508.21202
September 1, 2025 at 12:54 PM
I think this is quite interesting.
Still not really sure what to make of the imo surprising results.
Huge thanks to Gabe Goldberg and Pen Maddy for quite different forms of generous assistance.
Still not really sure what to make of the imo surprising results.
Huge thanks to Gabe Goldberg and Pen Maddy for quite different forms of generous assistance.
Reposted by Jason Chen
"In philosophy especially, I figure the reader is nearly always gasping for breath, in danger of being swept out to sea, so the writer should do everything in their power to help..." Penelope Maddy is interviewed by Nathan Ballantyne - @nathanballantyne.bsky.social - at The Workbench
“Pity the Poor Reader” - Daily Nous
"Pity the poor reader" is one of philosopher Penelope Maddy's writing maxims. Maddy is Distinguished Professor Emeritus at the University of California, Irvine, and is interviewed about her writing by...
dailynous.com
August 25, 2025 at 1:23 PM
"In philosophy especially, I figure the reader is nearly always gasping for breath, in danger of being swept out to sea, so the writer should do everything in their power to help..." Penelope Maddy is interviewed by Nathan Ballantyne - @nathanballantyne.bsky.social - at The Workbench
Reposted by Jason Chen
August 7, 2025 at 4:32 AM
Reposted by Jason Chen
July 28, 2025 at 4:16 AM
Reposted by Jason Chen
Vladimir Kanovei, Vassily Lyubetsky
Notes on the equiconsistency of ZFC without the Power Set axiom and 2nd order PA
https://arxiv.org/abs/2507.11643
Notes on the equiconsistency of ZFC without the Power Set axiom and 2nd order PA
https://arxiv.org/abs/2507.11643
July 17, 2025 at 4:49 AM
Vladimir Kanovei, Vassily Lyubetsky
Notes on the equiconsistency of ZFC without the Power Set axiom and 2nd order PA
https://arxiv.org/abs/2507.11643
Notes on the equiconsistency of ZFC without the Power Set axiom and 2nd order PA
https://arxiv.org/abs/2507.11643
Reposted by Jason Chen
Yale Philosophy offers a course on “Formal Philosophical Methods” — a broad introduction to probability, logic, formal semantics, etc.
Instructor Calum McNamara has now made all materials for the course (78 pages) freely available
static1.squarespace.com/static/6255f...
Instructor Calum McNamara has now made all materials for the course (78 pages) freely available
static1.squarespace.com/static/6255f...
June 30, 2025 at 5:41 PM
Yale Philosophy offers a course on “Formal Philosophical Methods” — a broad introduction to probability, logic, formal semantics, etc.
Instructor Calum McNamara has now made all materials for the course (78 pages) freely available
static1.squarespace.com/static/6255f...
Instructor Calum McNamara has now made all materials for the course (78 pages) freely available
static1.squarespace.com/static/6255f...
Reposted by Jason Chen
I built a little Shiny app that shows how often various words were used in 20 prominent philosophy journals from 1980-2019.
bweatherson.shinyapps.io/t20-graphs/
bweatherson.shinyapps.io/t20-graphs/
Word Usage in Philosophy Journals
bweatherson.shinyapps.io
May 15, 2025 at 3:43 PM
I built a little Shiny app that shows how often various words were used in 20 prominent philosophy journals from 1980-2019.
bweatherson.shinyapps.io/t20-graphs/
bweatherson.shinyapps.io/t20-graphs/
Reposted by Jason Chen
James Cummings, Yair Hayut, Menachem Magidor, Itay Neeman, Dima Sinapova, Spencer Unger
The tree property on long intervals of regular cardinals
https://arxiv.org/abs/2505.08118
The tree property on long intervals of regular cardinals
https://arxiv.org/abs/2505.08118
May 14, 2025 at 4:31 AM
James Cummings, Yair Hayut, Menachem Magidor, Itay Neeman, Dima Sinapova, Spencer Unger
The tree property on long intervals of regular cardinals
https://arxiv.org/abs/2505.08118
The tree property on long intervals of regular cardinals
https://arxiv.org/abs/2505.08118
Reposted by Jason Chen
My publisher wants alt text for my tikz figures, which is a good idea. They asked for a Word file, absurd, but here is my latex solution. I wrote \alttext macro. Place \alttext{alt text} at end of every tikz picture. Resulting pdf shows alt text with mouseover on figure.
May 11, 2025 at 12:59 AM
My publisher wants alt text for my tikz figures, which is a good idea. They asked for a Word file, absurd, but here is my latex solution. I wrote \alttext macro. Place \alttext{alt text} at end of every tikz picture. Resulting pdf shows alt text with mouseover on figure.
Reposted by Jason Chen
I'm excited to join the editorial board of a new diamond open access journal in mathematical logic:
ZML: Zeitschrift für Mathematische Logik und Grundlagen der Mathematik
zml.international
The open letter of the editors of ZML can be found online on the webpage.
ZML: Zeitschrift für Mathematische Logik und Grundlagen der Mathematik
zml.international
The open letter of the editors of ZML can be found online on the webpage.
ZML - Zeitschrift für Mathematische Logik und Grundlagen der Mathematik
ZML: Zeitschrift für Mathematische Logik und Grundlagen der Mathematik is an electronic Diamond Open Access research journal in mathematical logic publishing original research papers in all areas of m...
zml.international
April 7, 2025 at 4:15 PM
I'm excited to join the editorial board of a new diamond open access journal in mathematical logic:
ZML: Zeitschrift für Mathematische Logik und Grundlagen der Mathematik
zml.international
The open letter of the editors of ZML can be found online on the webpage.
ZML: Zeitschrift für Mathematische Logik und Grundlagen der Mathematik
zml.international
The open letter of the editors of ZML can be found online on the webpage.
A great pleasure to be nominated on the APA Committee on Non-Academic Careers. Looking forward to contributing back to the broader philosophical community in the next three years!
We are pleased to announce APA committee appointments for terms starting July 1, 2025. Congratulations to the appointees and thanks to all who were willing to serve! www.apaonline.org/news/694541/...
February 28, 2025 at 9:05 PM
A great pleasure to be nominated on the APA Committee on Non-Academic Careers. Looking forward to contributing back to the broader philosophical community in the next three years!
Reposted by Jason Chen
I don't speak German, and neither do my calculus students, but even so I think this is one of the best explanations of the derivative of sine and cosine I've ever seen.
Also, it's a bop that won't get out of my head.
#mathsky #iTeachMath
www.youtube.com/watch?v=tSov...
Also, it's a bop that won't get out of my head.
#mathsky #iTeachMath
www.youtube.com/watch?v=tSov...
Die Ableitung vom Sinus ist der Kosinus (Mathe-Song)
YouTube video by DorFuchs
www.youtube.com
January 29, 2025 at 4:36 PM
I don't speak German, and neither do my calculus students, but even so I think this is one of the best explanations of the derivative of sine and cosine I've ever seen.
Also, it's a bop that won't get out of my head.
#mathsky #iTeachMath
www.youtube.com/watch?v=tSov...
Also, it's a bop that won't get out of my head.
#mathsky #iTeachMath
www.youtube.com/watch?v=tSov...
Really reassuring that there's still a place where people enjoy talking about ideals, especially in today's society
January 28, 2025 at 8:16 PM
Really reassuring that there's still a place where people enjoy talking about ideals, especially in today's society
Really great stuff, wishing more mathematicians would spend some time writing about their fields like this. Set Theory and the Analyst is another great read with similar themes: arxiv.org/abs/1801.09149
January 7, 2025 at 8:31 PM
Really great stuff, wishing more mathematicians would spend some time writing about their fields like this. Set Theory and the Analyst is another great read with similar themes: arxiv.org/abs/1801.09149
A natural (uncountable) set of reals without a perfect subset, whose measurability can be shown via forcing! mathoverflow.net/a/484096
An uncountable measurable subset of $\Bbb R$ containing no nonempty perfect set
$\newcommand\R{\Bbb R}$Assuming the axiom of choice, is there an uncountable Lebesgue-measurable subset $S$ of $\R$ that contains no nonempty perfect set?
Of course, such a set $S$, if it exists, ...
mathoverflow.net
December 13, 2024 at 11:22 PM
A natural (uncountable) set of reals without a perfect subset, whose measurability can be shown via forcing! mathoverflow.net/a/484096
The hero we need but don't deserve
December 7, 2024 at 9:19 PM
The hero we need but don't deserve
See also the discussion in this MO thread: mathoverflow.net/a/482756
This is what makes set theory immensely appealing for me - properly mathematical pursuits inevitably run up against issues beyond the space between Theorem and QED: standards of refutation and acceptance, criteria for evidence, etc
This is what makes set theory immensely appealing for me - properly mathematical pursuits inevitably run up against issues beyond the space between Theorem and QED: standards of refutation and acceptance, criteria for evidence, etc
December 6, 2024 at 8:33 PM
See also the discussion in this MO thread: mathoverflow.net/a/482756
This is what makes set theory immensely appealing for me - properly mathematical pursuits inevitably run up against issues beyond the space between Theorem and QED: standards of refutation and acceptance, criteria for evidence, etc
This is what makes set theory immensely appealing for me - properly mathematical pursuits inevitably run up against issues beyond the space between Theorem and QED: standards of refutation and acceptance, criteria for evidence, etc
I'll be giving a talk at the ASL-APA 2025 Spring meeting (Feb. 27-March 1, 2025), on the subtly different uses of the Church-Turing Thesis (and relatives) in actual mathematical practice.
November 27, 2024 at 6:23 PM
I'll be giving a talk at the ASL-APA 2025 Spring meeting (Feb. 27-March 1, 2025), on the subtly different uses of the Church-Turing Thesis (and relatives) in actual mathematical practice.
So this is where the fun folks went
November 22, 2024 at 6:49 AM
So this is where the fun folks went