DON'T MAKE ME TAP THE SIGN

I’m late to this, but congrats to Janpreet, Isaiah, Parker, and Shahad on their successful presentations at Hofstra’s undergraduate research day! Always a fun end to the semester to see the culmination of student led research efforts. #PUI #proudpi

One Commencement down, one to go!

We took to the streets in Montgomery, Alabama, for the National Day of Action in defense of our voting rights. We will not go back to Jim Crow maps. Black voters deserve to have our voices heard.

Grades are in! Standards-based grading makes the last week of the semester terrible, but it's so worth it to get a light finals week (among all the other nobler reasons 😇).

OF COURSE SUOZZI VOTED YES. Because why not give DHS even more power and resources? They're doing such good and not at all harmful work. /s Please help me replace him. Primary is June 23. www.votewelch.com

Finals are over, and I'm hanging up the awards our majors gave me! I'm flattered. First year for Fastest Grader! #MathSky

For women in math day, let's remember that the US just bombed Maryam Mirzakhani's alma mater.

We lost Douglas Adams 25 years ago today. This has made a lot of people very sad and has been widely regarded as a bad move.

Instructions for my calculus students at this morning's final that look far weirder if you don't know "AI" stands for "applications of integration" in my class. #MathSky

Breaking our promises and letting people suffer is not putting America First. If America is to be first, let it be first in love. First in Justice. First in freedom. First in hope. Not whatever the hell is happening now. youtu.be/n6B_hSsmC9A?...

The goal in 2026/28 cannot be getting back to what was normal before Trump. What was normal before Trump got us here. That's why it isn't enough to flip the House this year. We have to stop sending complacent cowards to the halls of Congress, and my opponent, Tom Suozzi, is part of the problem.

Democracy needs you. Are you in? https://votefwd.org/campaigns

Anyone want to guess what we did in second semester real analysis today? #MathSky

It's alive! We've reanimated the Cascade Topology Seminar, which will hold its first meeting in three years at Portland State University May 30-31 this year. Please join us! Limited travel support available to early career researchers (funding deadline May 14). sites.google.com/view/cascade... 🧮

Look what I got today!

Hey there, Tom Suozzi officially has a primary challenger! If you've ever complained about Suozzi here, get out there for Danielle! 🗳️

So this is what my Calc 1 class came up with and solved this morning. There was applause at the end. #MathSky

The Hofstra tulips are blooming!

Excited to announce that the application for Rethinking Number Theory 7 is open! This is a virtual research workshop with 6 excellent number theoretic projects. June 22 - July 3. Application on our website. Please share widely and DM me if you have questions! sites.google.com/view/rethink...

If you work, you owe your thanks to former labor Secretary Frances Perkins – the architect behind the 40-hour workweek, the minimum wage, unemployment insurance, and Social Security. On her birthday today and every day, America’s unions celebrate her legacy and leadership.

Some of you are also voting in the spring and summer in democratic primaries. Some dems, like @tomsuozzi.bsky.social, have repeatedly opposed impeachment, censured fellow dems, STILL have said nothing about the threats against Iran, and are generally failing to meet this moment. We can do better.

Our PhD student Kennedy Orwa, who studies applications of AI to health care, was hastily deported today to Kenya along with his 13-year-old son without opportunity to speak to legal counsel. King 5 reports that he held a valid visa that was rescinded without explanation.

Officially published! The three of us agreed to start writing this book together almost exactly three years ago, and I'm delighted that it's available. #MathSky link.springer.com/book/10.1007...

🚨NEW PAPER ALERT🚨 Julia Knight, Karen Lange, et al., "Computable Π_2 Scott Sentences," Journal of Symbolic Logic, online first, pp. 1-24 www.cambridge.org/core/journal...

Except for Pete Hegseth, whom I wish a somber and studious Easter, because whatever chatGPT summary of the Bible he is relying on has failed him and he should feel bad.

Happy Easter! Hope the Easter kaiju visits you all.

Almost 150 entries from students in 30 US states, 2 Canadian provinces, and 5 other countries! It was a pleasure and privilege to organize this contest. Go read the winning essays and learn about some very cool people and very cool ways to use math on the job. #MathSky

Quarterly fundraising reporting is approaching. If you'd like Tom Suozzi to have a bad day, please consider chipping in $25 (or whatever you can afford!) to my campaign. A few reasons he deserves to have a bad day, or: Why I decided to stop writing angry emails and primary Tom Suozzi. 🧵

Sandra Wong, the great granddaughter of Wong Kim Ark, is preparing to march at the #NoKings Rally in San Francisco. Today is the 128th Anniversary of the SCOTUS decision affirming birthright citizenship.

Today is the 128th anniversary of the Supreme Court’s decision on birthright citizenship in U.S. v. Wong Ark Kim.

Tomorrow I will be at the No Kings event in Port Washington, NY. Hope to see some of you there! If you'd like to help collect signatures to make sure I'm on the ballot in June, I will be near the LIRR stop around 11, and will be in the area for a few hours after the event. #NoKings #PrimarySuozzi

We're reminding President Trump what it means to be born in the U.S.A. We're honored that the one and only Bruce Springsteen trusted us with use of his iconic anthem ahead of our landmark Supreme Court case, where we’re challenging President Trump’s attempt to overturn birthright citizenship.

finally a German Abel Prize winner

Hate Congress? Invest in a new one! I am running against Tom Suozzi (D(?)-NY), who continues to vote for laws that accelerate our descent into fascism. I, on the other hand, dislike fascism and want you to have nice things. www.votewelch.com

🚨 ALERT 🚨 Due to extreme conditions in the Vector Space, we are performing emergency maintenance on the linear independence monitoring systems. For the next 24 hours, use caution when handling a basis and refrain from constructing or using any isomorphisms while this issue is ongoing.

**Please share widely!** Announcing CTNT 2026: the Connecticut Summer School in Number Theory, and Research Conference! June 1-7, at UConn. Applications (for the summer school and/or conference) are now open thru our website: ctnt-summer.math.uconn.edu

More details and context about what being a woman math major in the early-2000s was like and why it was so damaging here: cooperativeoverlapping.substack.com/p/a-fuller-s...

Susan Haack, in memoriam periodicos.ufsc.br/index.php/pr...

Since SIGACT is on X but not BlueSky,* advertising the SIGACT Distinguished Service Award here, "given annually to an individual or group who has made substantial service contributions to the Theoretical CS community" #TCSSky ⏰ Nominate by April 30! sigact.org/prizes/servi... *I know. Ugh.

Yesterday's Pi Week math club celebration: playing "Math or Mural?" while eating pizza and pie. Today's Pi Week math club celebration: tabling in the student center and giving out free pie while doing a Buffon's Needle demo and a gravity well demo. Our students are pretty great.

So a single day for pi isn't enough for my students. Yesterday they kicked off Pi Week with the ritual chalking of the quad with the digits of pi and liquid nitrogen ice cream (physics club collab). 😊

Hey #MathSky, did you know that Henri Lebesgue's father was a typesetter? Support this Lego idea for Lebesgue!

This #InternationalWomensDay, consider supporting the woman challenging @tomsuozzi.bsky.social (me). If elected, I will be the first woman to represent this district, and one of the very few mothers of young children in Congress. And unlike Tom, I support *all* women, including Trans women.

Happy International Women's Day to all the wonderful Maths women - cis and trans - here on Bluesky 😀 #MathsToday

When your undergraduate academic advisor congratulates you on LinkedIn on a post about your forthcoming book... 🥹

Announcement: the Metro NY section of the MAA will be hosting its annual meeting at St. Thomas Aquinas College on 5/2! Abstract deadline 3/30, early reg 4/10. STAC is close to the NJ and Seaway sections, and we welcome our neighbors. We'll have shuttles from Metro North/NJ Transit. #MathSky

Today is St David’s Day: patron saint of Wales, of course, but also of vegetarians and poets. He was reputed to have helped introduce bees to Ireland. He is famously quoted as saying “Gwnewch y pethau bychain”, meaning “Do the little things”. Small changes and good choices matter, especially now.

I was a lot happier way back when every single day didn't sound like a new verse of "We Didn't Start The Fire"...