Jordan Ellenberg
@jsellenberg.bsky.social
Mathematician, writer, Orioles fan, Wisconsinite, cargo shorts dad
I'm moderating an online discussion for the National Academies today, 3pm eastern, on math, risk management, and natural disasters!
www.nationalacademies.org/event/45862_...
www.nationalacademies.org/event/45862_...
Risk Modeling and Management for Natural Disasters Innovation by the Numbers | National Academies
Learn more from the National Academies of Sciences, Engineering, and Medicine
www.nationalacademies.org
October 14, 2025 at 2:47 PM
I'm moderating an online discussion for the National Academies today, 3pm eastern, on math, risk management, and natural disasters!
www.nationalacademies.org/event/45862_...
www.nationalacademies.org/event/45862_...
Klartag improves the sphere-packing constant
Hey! It escaped my notice until this week that Boaz Klartag has recently shown the existence of lattice sphere packings in dimension d of density at least c d^2 2^-d. This lower bound was stuck at …
quomodocumque.wordpress.com
September 30, 2025 at 12:52 AM
Still relevant: my interview in the Atlantic from Election Eve 2020, about epistemic humility, what probabilities really mean, and how not to freak out. www.theatlantic.com/ideas/archiv...
A Math Whiz on How to Stop Stressing About Election Forecasts
An interview with the mathematician Jordan Ellenberg about politics, election forecasting, and how to think about the future like a pro
www.theatlantic.com
November 5, 2024 at 2:27 PM
Still relevant: my interview in the Atlantic from Election Eve 2020, about epistemic humility, what probabilities really mean, and how not to freak out. www.theatlantic.com/ideas/archiv...
Philosophers of probability, your moment has arrived
November 4, 2024 at 4:19 PM
Philosophers of probability, your moment has arrived
Somebody took the Harris for President sign off our lawn last night, but the joke is on them, the sign voted early
November 4, 2024 at 2:47 PM
Somebody took the Harris for President sign off our lawn last night, but the joke is on them, the sign voted early
It's corny I know but I do enjoy Maya Rudolph as Simulacramala.
November 3, 2024 at 9:01 PM
It's corny I know but I do enjoy Maya Rudolph as Simulacramala.
I actually picked up my landline and answered a poll the other day, so when you read that Harris is winning a stunning 100% of white men age 45-55 in Wisconsin, that's me
November 1, 2024 at 2:40 AM
I actually picked up my landline and answered a poll the other day, so when you read that Harris is winning a stunning 100% of white men age 45-55 in Wisconsin, that's me
Just thinking about actors whose names are close to old-timey adverbs. Charlize Thereon. Reese Whitherspoon. Chris Henceforth.
October 30, 2024 at 1:49 AM
Just thinking about actors whose names are close to old-timey adverbs. Charlize Thereon. Reese Whitherspoon. Chris Henceforth.
Students in the UW system make up almost 3% of Wisconsin's population. www.wmtv15news.com/2024/10/29/e...
Enrollment inches upward in Universities of Wisconsin system
Overall enrollment in the Universities of Wisconsin system’s four-year schools ticked upward this fall compared with last year, data released Tuesday shows.
www.wmtv15news.com
October 29, 2024 at 7:58 PM
Students in the UW system make up almost 3% of Wisconsin's population. www.wmtv15news.com/2024/10/29/e...
Really nice new paper by Canning, Larsen, Payne, and Willwacher which shows how far we've come in understanding unstable cohomology of M_g arxiv.org/abs/2410.19913
Moduli spaces of curves with polynomial point counts
We prove that the number of curves of a fixed genus g over finite fields is a polynomial function of the size of the field if and only if g is at most 8. Furthermore, we determine for each positive ge...
arxiv.org
October 29, 2024 at 2:18 PM
Really nice new paper by Canning, Larsen, Payne, and Willwacher which shows how far we've come in understanding unstable cohomology of M_g arxiv.org/abs/2410.19913
You too, Politico? No. No! The districts you are talking about are not rural just because they are not in Madison or Milwaukee! www.politico.com/news/2024/10...
Have Democrats found a way to win over rural America? Look at what's happening in Wisconsin.
The party’s hot streak in statewide elections faces a crucial test in out-state districts long held by Republicans.
www.politico.com
October 28, 2024 at 4:03 AM
You too, Politico? No. No! The districts you are talking about are not rural just because they are not in Madison or Milwaukee! www.politico.com/news/2024/10...
I used to have a car like that
i drove for nearly 11 hours today and didn’t change time zones
October 27, 2024 at 3:33 AM
I used to have a car like that
Syllabus for Michael Harris's course on mathematics and the humanities:
www.math.columbia.edu/~harris/webs...
www.math.columbia.edu/~harris/webs...
Michael Harris | MATHEMATICS GU4200, Spring 2025 (page under construction)
Professor of Mathematics
www.math.columbia.edu
October 26, 2024 at 2:31 PM
Syllabus for Michael Harris's course on mathematics and the humanities:
www.math.columbia.edu/~harris/webs...
www.math.columbia.edu/~harris/webs...
Bad headline writing from the Chicago Tribune! The amendment would remove the constitutional guarantee of the right to vote that US citizens in Wisconsin currently enjoy.
www.chicagotribune.com/2024/10/19/w...
www.chicagotribune.com/2024/10/19/w...
Wisconsin voters consider constitutional amendment barring noncitizens from voting
Republican legislators are asking voters for permission to amend the state constitution to clearly prohibit foreign nationals from voting in any election held in the state.
www.chicagotribune.com
October 24, 2024 at 10:16 PM
Bad headline writing from the Chicago Tribune! The amendment would remove the constitutional guarantee of the right to vote that US citizens in Wisconsin currently enjoy.
www.chicagotribune.com/2024/10/19/w...
www.chicagotribune.com/2024/10/19/w...