Vince Vatter
@vatter.bsky.social
1.1K followers 710 following 100 posts
Mathematician at the University of Florida. Here for the hot takes. Also @[email protected]
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vatter.bsky.social
Thanks to co-PIs Sarah Sword, @jaypantone.com, and Ryota Matsuura, and to our advisory board, for countless hours shaping what good proof feedback should look like.
vatter.bsky.social
Teaching intro to proofs this semester or next? We have a couple of spots left for college/university faculty who would be interested in participating in a field test. Details on the site, or reply or DM.
vatter.bsky.social
Try it: hallmos.com

Free, browser-based, no account. Students, professors, and the proof-curious are welcome. Choose from common intro-to-proofs exercises, or use the sandbox with your own exercise.
HaLLMos
hallmos.com
vatter.bsky.social
I'm excited to share: we built a free AI coach for intro-level proof writing. It critiques drafts, points out gaps, and helps you or your students iterate without giving away the answer. Also for lapsed mathematicians to see if they've still got it. Demo below, link in reply.
vatter.bsky.social
Published today in the Notices of the AMS. Lol.
Federal Funding for Mathematics Research—What’s Changed in the Last Six Years?

This article was solicited in early 2024 and completed in Fall 2024. It therefore does not reflect the changes that have occurred, and which are still going on, at federal science-funding agencies in 2025. For example, website links given in the article may not be active at the time of publication. - Ed.
vatter.bsky.social
meanwhile, wikipedia is in existential crisis over whether √4 deserves its own page
Screenshot of a Wikipedia deletion discussion about whether redirects like “Square root of 4” and “Sqrt4” should exist. Editors argue over consistency, usefulness, and whether Wikipedia should function as a calculator. Some favor keeping the redirects for user convenience, others call them unnecessary or harmful. One comment invokes “Square root of 2209,” another disputes the logic entirely, and someone questions how to handle both positive and negative roots. The tone ranges from procedural to mildly exasperated.
vatter.bsky.social
people like years more than ever though. reliably, year X mentions peak during year X+2.
Line graph showing the frequency of years ending in “00,” from 1800 to 2020, in English books.
vatter.bsky.social
interest in the natural numbers is at an all-time low
Google Ngram Viewer line graph showing the frequency of digits 0 through 9 in English books from 1800 to 2019, with usage peaking around 1980 and declining sharply afterward.
Reposted by Vince Vatter
vatter.bsky.social
Of course they would choose a math major
vatter.bsky.social
It’s final exam season again, and I like to display a clock while proctoring.
But all the web clocks google suggests suck.
So I made one (okay, tbh, chatgpt made it under my supervision):
digit.party/clock
Digit Party Clock
A minimalist analog and digital clock. Perfect for proctoring exams, or just keeping time beautifully.
digit.party
vatter.bsky.social
AI debt collector exhibiting speciesism
AI: Hello, is this Ms. Zhang San?
User: This is Ms. Zhang San’s robot phone assistant, may I ask what you want to discuss with her?
AI: Sorry for disturbing you, goodbye!
vatter.bsky.social
Needless to say, A001339 is not the same sequence, does not count preferential arrangements, and neither sequence has anything to do with the egf 1⁄(2−exp(x)). All of this was completely made up.
A001339
a(n) = Sum_{k=0..n} (k+1)! binomial(n,k).
1, 3, 11, 49, 261, 1631, 11743, 95901, 876809, 8877691, 98641011, ...
Reposted by Vince Vatter
prietschka.bsky.social
'bc I'm tired'

Excellent example of how LLMs just reproduce what they've seen in their training data.
vatter.bsky.social
you're what now chatgpt?
ChatGPT-4o:

"go to OEIS bc i’m tired: [1, 1, 1, 2, 5, 17, 73, …] → OEIS A001339"
vatter.bsky.social
you're what now chatgpt?
ChatGPT-4o:

"go to OEIS bc i’m tired: [1, 1, 1, 2, 5, 17, 73, …] → OEIS A001339"
vatter.bsky.social
I mean, it’s still better to have money than not have money right?
vatter.bsky.social
you'll never guess what color my daughter's squares ended up
Instructions for assignment: Color each square blue. Color each rectangle yellow. Color each circle red.
vatter.bsky.social
Everyone hates springing forward but loves falling back. Proposal: Abolish leap days, and redistribute those hours in the form of 6 annual "fall back" holidays. More sleep, less leap. A clear pareto improvement to our calendar.
vatter.bsky.social
André's Reflection Method 😃
vatter.bsky.social
Logical proof that "months" are fake.

Most people born in April are Aries.
All Aries are born in March or April.
Most people born in March or April were born in March.
Therefore, most people born in April were born in March.
vatter.bsky.social
I asked GPT-4o to flip a coin 10,000 times. Same prompt, same parameters, but the *odds of getting Heads* took on 42 different probabilities (none below 85% btw). Obv don't use gpt-4o to flip your coins, but what the hell is going on? Here are some thoughts.
towardsdatascience.com/avoidable-an...
Avoidable and Unavoidable Randomness in GPT-4o | Towards Data Science
Exploring the sources of randomness in GPT-4o from the known and controllable to the opaque and uncontrollable.
towardsdatascience.com