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Mitch Keller

@mitchkeller.phd
636 followers 255 following 674 posts

I teach math, advise math majors, and do program assessment for UW-Madison. Baker. Global traveler. Photographer. North Dakota native. ⚡️ @mitchkeller.photos

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Reposted by Mitch Keller
Dan Shafer @danshafer.bsky.social · 21/09/2026
Republicans' entire campaign against David Crowley is just this, over and over.
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Mitch Keller @mitchkeller.phd · 21/09/2026
Wrapped up a short trip to DC with a visit to the Embassy of the Grand Duchy of Luxembourg to the United States so I could apply for my Luxembourg passport and ID card.
A middle-aged bald white man with a goatee wearing a gray shirt. He stands in front of a European-style building flying the flags of the EU, Luxembourg, and Ukraine.
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Reposted by Mitch Keller
Bolts @boltsmag.org · 19/09/2026
Missouri and Montana would have some of the nation’s most robust constitutional protections for direct democracy if voters approve two citizen-initiated ballot measures this fall.
boltsmag.org
To Protect Direct Democracy, Two States Mull a New Approach: Name It As a Right - Bolts
Ballot measures in Missouri and Montana would strengthen citizen-led initiatives. Democracy advocates in each state are going on the offense after facing years of attack.
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Reposted by Mitch Keller
Slate @slate.com · 17/09/2026
Judge Saylor’s opinion consists mostly of expressions of bafflement at the idea that anyone would ever take this policy proposal seriously. slate.trib.al/JFNRTd1
slate.trib.al
Trump’s New Effort to Mess With Student Visas Was Shot Down in Humiliating Fashion
The change was set to take effect on Tuesday.
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Mitch Keller @mitchkeller.phd · 15/09/2026
Surprised not to see anything about this in my feed this morning from the LawSky folks I follow. I’m sure CA1 won’t stay the PI, but this feels like wildcard territory at SCOTUS. Hopefully @chrisgeidner.bsky.social gives this some attention at @lawdorknews.bsky.social today.
insidehighered.com
Judge Blocks Controversial International Student Restrictions
A Massachusetts judge issued the injunction hours before the regulation was set to take effect. Institutions worried it would harm international students.
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Reposted by Mitch Keller
Aaron Reichlin-Melnick @reichlinmelnick.bsky.social · 13/09/2026
1.2 million foreign students represents just 6% of the 19.4 million students studying as of 2025. But even that is too high, as the 1.2 million number includes ~300,000 people on post-graduate Optional Practical Training (OPT), meaning foreign students are sub-5%.
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Mitch Keller @mitchkeller.phd · 13/09/2026
Say what you want about Wisconsin electing Supreme Court justices in April elections, but one thing this state unequivocally got right: it is constitutionally impossible for more than one of the seven seats on the Supreme Court to be up in any given year.
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Mitch Keller @mitchkeller.phd · 04/09/2026
The one that didn’t need a fifth down to beat Mizzou remains the only legitimate national champion from 1990. But man, that display from the Jackets tonight was an embarrassment.
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Mitch Keller @mitchkeller.phd · 22/08/2026
Academics, to "celebrate" the start of a new semester, post a WayBack Machine snapshot of your workplace from when you were applying to college (or a later milestone if you missed the dawn of dot edu) #WayBackCollegeChallenge
Screenshot of wisc.edu from February 2000. Link in upper left for text only version. Images are small and low res, but links go to the same things you’d find on the homepage today.
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Reposted by Mitch Keller
Anthony Michael Kreis @anthonymkreis.bsky.social · 12/08/2026
Folks, stop whining about Wisconsin polling being off. The gold standard, Marquette Law, had Hong’s support dead on in this July 29 release. If you look at it closely, what’s obvious now is that this was her ceiling, and what was obvious even then— most of the electorate was figuring out what to do.
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Reposted by Mitch Keller
Dan Shafer @danshafer.bsky.social · 11/08/2026
A reminder, as polls open in Wisconsin: Wisconsin has same-day voter registration. So, if you haven’t registered or need to re-register, you can do so at your polling place (with ID and proof of residence) TODAY. Every state should do this. It’s great that Wisconsin does this. Go vote.
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Mitch Keller @mitchkeller.phd · 02/08/2026
Yes, I did a thing with my hair (or lack thereof) about a month ago. I like it. That’s not the point here. Today I visited the grave of my great great great grandfather Nicholas Steffen in Platteville, WI.
A middle-aged white man with a shaved head and sunglasses in a cemetery. He holds a Luxembourg flag and a piece of paper with a lion rampant on it. Behind him is a gravestone with the name Nicholas Steffen.
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Mitch Keller @mitchkeller.phd · 23/07/2026
This is really, really fucked up from our Madison PD, who I learned tonight from a friend don’t wear body cameras. The videos are in the article in @chrisgeidner.bsky.social’s skeet in reply to the one I quoted. They are more disturbing than I imagined after reading the article.
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Mitch Keller @mitchkeller.phd · 16/07/2026
TFW four months after discovering your great great grandfather was born in Luxembourg, you are able to look yourself up in the national registry and confirm that your Luxembourgish nationality is now officially recognized and you can get your second passport. 🇱🇺 🦁
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Mitch Keller @mitchkeller.phd · 02/07/2026
‘Kavanaugh presenting a “living Constitution” argument for ending birthright citizenship is either an effort that highlights limitations of his reasoning skills or a troll. It’s hard to see it any other way.’
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Reposted by Mitch Keller
Mark Joseph Stern @mjsdc.bsky.social · 30/06/2026
The vote on the constitutional question in the birthright citizenship case is an absolute scandal slate.com/news-and-pol...
On Tuesday, the Supreme Court ruled that the first sentence of the 14th Amendment means exactly what it says: Birthright citizenship is the nation’s fundamental law, and Donald Trump cannot repeal it via executive order. The vote was 5–4. This outcome is, of course, a relief. But the margin is a scandal. It is nothing short of stunning that Trump came one vote away from convincing the Supreme Court to repeal the bedrock of the Reconstruction Amendments based on a brazenly partisan contortion of their text and history. A view held only by fringe, far-right nativists until very recently has secured support from four of the nine members of the court: Justices Clarence Thomas, Samuel Alito, Neil Gorsuch, and Brett Kavanaugh. This is a shocking development that should upend all expectations that this Supreme Court can be trusted to apply the most basic constitutional guarantees when a Republican president seeks to nullify them. If a theory flatly rejected by all serious legal scholars and historians can come one vote away from success, no rights are safe. Everything is on the table.
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Reposted by Mitch Keller
Mitch Keller Photography @mitchkeller.photos · 29/06/2026
Happy pride from Chicago! #bluehourphotography #blueskyartshow #pridemonth
Chicago City Hall at blue hour. The columns on the facade are lit up in rainbow colors.
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Mitch Keller @mitchkeller.phd · 23/06/2026
I have Josiah (Jed) Bartlet and Leo Thomas McGarry. Jed doesn’t really have a silly nickname, although sometimes I do call him my chonky boy. Leo has this very squeaky meow, so he often gets called Squeaky. If Lord John Marbury made an appearance, he would undoubtedly call him Gerald.
Josiah Bartlet (the cat) is a gray tabby who is sleepy and on my lap with his eyes just barely open. Leo is not pictured because he has climbed the cat tree for bed already.
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Reposted by Mitch Keller
Oscar Levin @oscarlevin.com · 17/06/2026
Thinking about #accessibility for your #math course materials for the Fall semester? Join @mitchkeller.phd and me for a virtual 3-day workshop next week hosted by the Ohio section of the MAA: More at mathtech.org/workshops/oh...
mathtech.org
Ohio MAA 2026 Summer Workshop
Showcasing open-source technologies that innovate mathematics education and communication.
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Slate @slate.com · 22/05/2026
A lesson on social network discrimination for the Supreme Court. slate.trib.al/m462A5z
slate.trib.al
Sam Alito’s Math on “Color-Blindness” Doesn’t Check Out
The math will not change. The only question is whether our laws will reckon with it.
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Reposted by Mitch Keller
Patrick Chovanec @prchovanec.bsky.social · 13/05/2026
Watching a series of former Confederate states rush to eliminate any vestige of black representation in the House pretty much answers the question whether the Voting Rights Act was still necessary.
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Mitch Keller @mitchkeller.phd · 13/05/2026
I got about 3/4 of the way through episode 1 on my jog this morning, and this is shaping up to be a fascinating season of Slow Burn.
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Mitch Keller @mitchkeller.phd · 08/05/2026
#PreTeXtGang win during the Canvas outage: I had been embedding worksheets and annotated notes in Canvas (Thanks @oscarlevin.com !) from GitHub-pages deployed stuff. Just had to email students direct links to the entire thing. Quickly built and deployed exam questions that had been posted as SCORM.
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Mitch Keller @mitchkeller.phd · 22/04/2026
Oh, hey, it’s @uwmadisonmath.bsky.social’s @jsellenberg.bsky.social getting elected to AAAS!
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Reposted by Mitch Keller
Jon Becker @jonbecker.bsky.social · 18/04/2026
Well, well, well... the deadline for compliance with the new Title II accessibility guidelines has been extended by a year (or two, depending on the size of your organization)
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Reposted by Mitch Keller
Mitch Keller Photography @mitchkeller.photos · 14/04/2026
Blue Hour View from the Citadella In honor of Hungary 🇭🇺 voting to stand for freedom and democracy yesterday, here’s a shot from my recent trip. Pentax K-3 iii smc Pentax-DA 18–270mm at 88mm stitched to a panorama in Lightroom Classic
View overlooking Budapest at blue hour. Buda Castle is prominently lit in the left. The Chain Bridge stands in the foreground, crossing the Danube. Parliament and Margaret Bridge sit deeper into the scene.
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Mitch Keller @mitchkeller.phd · 12/04/2026
Spent five nights in Budapest during Spring Break, leaving on April 2nd. Hungary is a wonderful country, and as a mathematician, I have had more opportunities than most Americans to get to know Hungarians. (My academic brother is Hungarian and my office neighbor at UW is as well.)
View of the Hungarian parliament building at night, from the Buda side of the Danube. Photo taken from my hotel window, actually 😁
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Mitch Keller @mitchkeller.phd · 01/04/2026
I always forget that I share a birthday with Sam Alito until social media reminds me. @maddow.bsky.social is also in the April Fool’s Day baby club, too, which I appreciate more.
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Reposted by Mitch Keller
Carter @magnacartergt.bsky.social · 25/03/2026
had a dream where i was taking a math final. on page 2 was a problem i immediately recognized as an "x choose y" problem @mitchkeller.phd
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Mitch Keller @mitchkeller.phd · 23/03/2026
That last sentence! (Read the whole piece, please.)
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Mitch Keller @mitchkeller.phd · 14/03/2026
This is undoubtedly the home of the Math Department at Bee State University.
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Mitch Keller @mitchkeller.phd · 05/03/2026
Always read Chris’s reporting, but today make sure you make it to the end for the courthouse mystery!
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Mitch Keller @mitchkeller.phd · 26/02/2026
This semester I'm teaching combinatorics. I'm using my own open-source text (appliedcombinatorics.org) I have lost count of how many times I've taught combinatorics, and yet most semesters, I discover something new along the way. Thought I'd thread a little discussion of what I came across today 1/9
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MAA @joinmaa.bsky.social · 25/02/2026
Dr. Camille McKayle has been named the next Executive Director of the MAA, effective September 1, 2026. A mathematician and experienced STEM leader, she brings deep commitment to mathematics education and the mathematical community. Read more: bit.ly/4kUylOU
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Mitch Keller @mitchkeller.phd · 19/02/2026
We in @uwmadisonmath.bsky.social are excited to launch a new MS in Applied & Computational Math this fall. The program offers modern training in applied & computational math and data‑focused quantitative skills, designed for students with strong math or quantitative backgrounds. Please share widely!
math.wisc.edu
MS-ACM Program
The MS in Applied and Computational Mathematics provides students with a broad, modern training in applied and computational mathematics, and in the   mathematics of data.  The program serves students...
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Mitch Keller @mitchkeller.phd · 18/02/2026
Two @uwmadisonmath.bsky.social colleagues on this list!
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Reposted by Mitch Keller
Chris Geidner @chrisgeidner.bsky.social · 17/02/2026
I just saw a bunch of the credulous reporting on this new conflicts check system, and, my god, it's so embarrassing. Please, read and subscribe to Law Dork for independent legal journalism. Save yourself from the bullshit.
lawdork.com
SCOTUS changed the rules for bringing cases to the court because John Roberts won't sell his stocks
Roberts and Alito are the only two justices who own individual stocks. Also: A new lawsuit challenges the Trump admin's removal of the Pride flag at the Stonewall Monument.
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Starfire’s Deranged Neocon Foreign Policy Podcast @irhottakes.bsky.social · 09/02/2026
Yes, Mister Bunny’s performance was obviously political. But I think everything short of gargling a meth addicted klansman’s truck nuts comes across as an implicit denunciation of the president nowadays.
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Chris Geidner @chrisgeidner.bsky.social · 08/02/2026
I took my time with this one — almost as much time as Jones took after arguments to write her opinion backing Trump — because I think it’s a very important, alarming ruling. So, yes, I hope folks do read this. www.lawdork.com/p/fifth-circ...
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Carl T. Bergstrom @carlbergstrom.com · 30/01/2026
House Minority Leader Hakeem Jeffries (D-N.Y.) on Thursday said House Democrats will demand that CBP be banned from squaring the circle, trisecting angles with straightedge and compass.
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Mitch Keller @mitchkeller.phd · 29/01/2026
🤦‍♂️ Sadly, there were 44 comments before mine, and I was the first to point out that this is nonsense.
A screenshot of a Facebook post from the Georgia Tech Alumni Association. Text reads “At Georgia Tech, triple integrals aren’t just homework; they’re jump scares.” The image in the post is a triple integrals on a white background enclosed by a gold rectangle. The integral is \int_{-1}^1 \int_0^z \int_{x-z}^{x+z} (x+y+z) dx dy dz.
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Steve Vladeck @stevevladeck.bsky.social · 24/01/2026
This sure seems more like the tyranny the Constitution is supposed to protect against than forgiving student loans.
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Mitch Keller @mitchkeller.phd · 22/01/2026
Sure would be nice if Georgia Tech undid all their hasty complying in advance that destroyed the Women’s Resource Center, LGBTQIA Resource Center, Office of Minority Education, etc. etc. etc.
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Laura Jedeed @laurajedeed.bsky.social · 13/01/2026
A few months ago, ICE hired me I didn't sign and submit any paperwork. I almost certainly failed the drug test. I'm real outspoken about my opposition to the Trump administration, and I am extremely googlable And yet, there it was, in plain English. "Welcome to ICE!" My latest for Slate
slate.com
You’ve Heard About Who ICE Is Recruiting. The Truth Is Far Worse. I’m the Proof.
What happens when you do minimal screening before hiring agents, arming them, and sending them into the streets? We're all finding out.
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Mitch Keller @mitchkeller.phd · 08/01/2026
Or conferences organized by international professional societies
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Mitch Keller @mitchkeller.phd · 26/12/2025
Festive baking! Dessert after Christmas dinner tonight was @americastestkitchen.com Mini Peanut-Praline Chocolate Pies. Three fun techniques: mini pie shells baked on inverted muffin tin, hard caramel + peanut butter in food processor for praline, and namelaka (~ganache with gelatin).
Seven mini pies on a platter. The pies have a ganache-like topping piped in various patterns on top. The platter sits on a festive placemat and some holiday greenery is in the background.
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Mitch Keller @mitchkeller.phd · 18/12/2025
Sign you had a bunch of awesome students this semester: a third of them were hanging out in the lobby after the final talking about the questions and then just wanted to keep chatting with you for like half an hour. (Only 5 stayed that long, but that’s still nearly 20% of the class.)
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