iiinova — where your digital self keeps evolving

Estes, John @johnestesmath.bsky.social · 15/04/2026

Tait thought all 3-conn 3-regular planar graphs were Hamiltonian, which would have proven the Four Color Theorem. Tutte provided a counterexample.

Tutte’s counterexample to Tait’s conjecture

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Estes, John @johnestesmath.bsky.social · 05/02/2026

After MS passed a law that required age verification on social media platforms, Bluesky was blocked in the state for close to a year. I guess age verification is on this app now, so… what have yall been up to?

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ML Brennan @brennanml.bsky.social · 21/03/2025

Okay, this is my newest very very favorite meme.

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SEIU_ORG @seiu.org · 22/03/2025

New data from @immcouncil.org proves it: Immigrants fuel the economy, paying $651.9 BILLION in taxes and $1.7 TRILLION in spending power! Check out the data in your state with this interactive tool: data.americanimmigrationcouncil.org/map-the-impa...

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John Skiles Skinner @skiles.blue · 21/03/2025

I helped build a government AI system. DOGE fired me, rolled the AI out to the whole agency, and implied the AI can do my job and the jobs of the others they've fired. It can't. But, what DOGE accidentally revealed about themselves in the process is fascinating. 🧵

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Estes, John @johnestesmath.bsky.social · 17/03/2025

"I'm sorry we went a couple of minutes over today, but some of you come in 5-10 minutes late, so I feel like you owe me." Is that too aggressive?

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David Ho @davidho.bsky.social · 01/03/2025

All websites that depend on NOAA data should display something like this. earth.nullschool.net

Weather and climate data shown on this website and countless others are at risk.

The National Oceanic and Atmospheric Administration (NOAA) is the U.S. agency responsible for global weather forecasting, hurricane prediction, ocean observation, and many other services vital to public safety. Its satellites, supercomputers, and research teams provide essential data that help us understand our planet and protect lives.

On February 27, the new U.S. administration initiated mass firings at NOAA. These actions are unethical and deeply disruptive to the talented scientists and engineers who dedicate themselves to the public good. The firings, along with expected budget cuts, have serious implications for the availability and quality of weather forecasts produced by the United States. They must be reversed immediately.

Much of the data on this website is downloaded directly from NOAA's servers. In this environment of uncertainty, access could be disrupted at any time. While I'll strive to keep all features on this website functional and switch to alternative data sources if necessary, some datasets have no substitute if they go offline.

If this concerns you, speak up. Share on social media. And if you're in the U.S., contact your representatives.

- Cameron

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RedditCFB @redditcfb.com · 07/02/2025

The Conference USA schedule is very elegantly done. Here is a graph of the teams that *don't* play each other this year. With this setup, it's impossible for more than 2 teams to go undefeated, and 8-0 team in conference is guaranteed to make the conference championship.

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Estes, John @johnestesmath.bsky.social · 07/02/2025

When including titles/abstracts in a conference program, is it okay to have LaTeX snippets? For example, "Proving \sqrt{2} is irrational".

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Dr. Melanie Lenahan @melanielenahan.bsky.social · 05/02/2025

Best news ever! Registration for the 2025 Grading Conference is OPEN! Please join us to promote grading practices focused on equity & authentic learning. Consider submitting an abstract or volunteering! We value your contributions! #gradingreform Link: www.centerforgradingreform.org/grading-conf...

centerforgradingreform.org

The Grading Conference

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Estes, John @johnestesmath.bsky.social · 28/01/2025

What are the dimensions of the 1000-piece puzzle that has the fewest boarder pieces?

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Estes, John @johnestesmath.bsky.social · 26/01/2025

It kind of feels like it's going to be a long year.

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Estes, John @johnestesmath.bsky.social · 24/01/2025

We’re hosting the LA/MS MAA section in February at Belhaven. If you’re in the area, we’d love to have you come by.

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Estes, John @johnestesmath.bsky.social · 22/01/2025

We say a divides b iff you can have a rectangular Lego brick with b total studs and a studs along one side.

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Avery @averypickford.bsky.social · 20/01/2025

Chess Sudoku. Cool. I completed #Ronin #26 www.andrewt.net/puzzles/roni...

andrewt.net

Ronin

A sudoku game played on a chessboard

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Steve Phelps @mathtechcoach.bsky.social · 19/01/2025

Here is another contribution to #genuary #genuary2025 #genuary19 "Op art." openprocessing.org/sketch/2515924

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Estes, John @johnestesmath.bsky.social · 13/01/2025

Tomorrow, 8:00 am, Discrete Math. It’s going to be a banger

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Estes, John @johnestesmath.bsky.social · 09/01/2025

.@divbyzero.bsky.social I got a 404 error looking up your latex cheatsheet on Dickinson’s service. Do you have it shared somewhere else?

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Estes, John @johnestesmath.bsky.social · 07/01/2025

My son had an assignment in class where he had to turn a Christmas tree into something else. I’m such a proud father.

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Robert "The Bobby Yaga" McNees @mcnees.bsky.social · 03/01/2025

Occasional PSA, 2025 edition: @duetosymmetry.com and I made a graph paper package for LaTeX. Various grid styles (graph, quadrille, hex, iso, dot grid, etc), custom and pre-defined colors. Print out or make templates for your tablet. Github: github.com/mcnees/LaTeX... CTAN: ctan.org/pkg/gridpapers

A light blue grid on a white background.

A red isometric grid on a pink background.

A brown grid with major and minor lines, on a pale yellow background.

A green hex grid on a light green background.

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Lucy @leftliblucy.bsky.social · 03/01/2025

"just immigrate legally bro"

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Estes, John @johnestesmath.bsky.social · 02/01/2025

Teaching Intro to Real Analysis this Spring and trying hard to make it interactive or engaging. Anyone have any resources they’d share? #MathSky🧮

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Estes, John @johnestesmath.bsky.social · 25/12/2024

Googling “can dogs eat jicama?"

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Estes, John @johnestesmath.bsky.social · 25/12/2024

I’m overwhelmed. Merry Christmas!

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Steven Strogatz @stevenstrogatz.com · 15/12/2024

Hi Adam, I take your point that the quadratic formula can be presented in a way that does not inspire understanding or affection. And it sounds like that's how it was taught to you. So let me try to make a better case for it. Here's how I discussed it in my book The Joy of x. (1/9)

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Estes, John @johnestesmath.bsky.social · 12/12/2024

Got a new phone today and it takes the entire day to do that. BTW, you need 2-step verification to open YouTube now

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Christian Stump @christianstump.bsky.social · 06/12/2024

Associahedra are rich mathematical structures. They are for example connected to binary trees, Coxeter-Catalan combinatorics, root systems, cluster algebras, scattering amplitudes Type H3 associahedra are rarely seen in the wilderness. But I was able to photograph two this morning. #Math #MathSky

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Estes, John @johnestesmath.bsky.social · 04/12/2024

13 is the measure of my disappointment

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Estes, John @johnestesmath.bsky.social · 03/12/2024

🧮 how many ways can we sum to m given n unique digits? Ex: m = 7, n = 2, we have three sums (1, 6), (2, 5), (3, 4)

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Matt Macauley @visualalgebra.bsky.social · 01/12/2024

I made a Starter Pack for #MathSky, since the one @tienchihmath.bsky.social made (go.bsky.app/66Us7WW), is at max capacity. But I need your help! Let's crowdsource this to make it better. Reply with suggestions. **Please don't feel shy to self-nominate!** go.bsky.app/GiRFQ8D

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🇵🇸Tim Henke (tɪm 'ɦɛŋ.kə) @timhenke.bsky.social · 29/11/2024

You can start with the mathsky starter pack: go.bsky.app/66Us7WW

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Estes, John @johnestesmath.bsky.social · 27/11/2024

I completely forgot about this video... don't remember making it... BUT apropos to a recent convo on this website. youtu.be/eDharJeRMs8?...

youtu.be

Are These Algebraic Truths?

YouTube video by John Estes Math

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Robert Talbert @roberttalbert.bsky.social · 27/11/2024

Higher ed friends in the USA: Put your grading down and take the rest of the day off, and tomorrow. And Friday and the weekend. It's Thanksgiving *breaK*. Don't @ me, I don't make the rules.

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Estes, John @johnestesmath.bsky.social · 25/11/2024

My younger son loves naming fictional characters by their enneagrams and Meyers Briggs types. INFJ: Anxiety from Inside Out 2. ENFJ: Phil Dunphy Enneagram 3: Thorin Oakenshield

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Estes, John @johnestesmath.bsky.social · 23/11/2024

Yeah I was right. It's the worst.

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Randall Munroe @xkcd.com · 23/11/2024

D&D Combinatorics xkcd.com/3015

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Thiago Carvalho @cyrilpedia.bsky.social · 21/11/2024

'For scientists the network is starting to look like home. Academic institutions, scientific journals and conferences, and international organizations such as the World Health Organization have established a presence there in recent days.' www.science.org/content/arti...

science.org

Like ‘old Twitter’: The scientific community finds a new home on Bluesky

After recent changes to Elon Musk’s X, a gradual migration turns into a stampede

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Estes, John @johnestesmath.bsky.social · 21/11/2024

How about this one? Chock the vertical line test failure to skewing.

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Estes, John @johnestesmath.bsky.social · 21/11/2024

We like to print these cube puzzles to give away to visitors and alum. My lab workers decided to go big!

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Estes, John @johnestesmath.bsky.social · 21/11/2024

How to get students to stop canceling a for things like (a + b)/(a + c).

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Jared Hutchins @pablohutch.bsky.social · 11/11/2024

I teach a class on data science here at Illinois and during the seminar I host a competition for the class called "The Hunt for the Worst Data Visualization." This was my most popular post on Xitter, so reproducing some of the best submissions from previous years here:

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Andy Hall @testtubegames.com · 20/11/2024

The solar system as seen from Mercury. Try it yourself here -> www.testtubegames.com/gravity.html... (tip, you may want to speed up time a bit... 🧪)

Lots of looping orbits. In the middle a dot labeled "Mercury". Around that a yellow circular orbit labeled "Sun". Then looping orange labeled "Venus", blue looping orbit labeled "Earth" and red looping orbit labeled "Mars". This is the solar system seen from the perspective of a stationary Mercury.

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Estes, John @johnestesmath.bsky.social · 20/11/2024

What function would look like this?

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Estes, John @johnestesmath.bsky.social · 17/11/2024

"Wow... this is going to be a crazy week" the professor said to himself for the 15th consecutive Sunday.

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Estes, John @johnestesmath.bsky.social · 17/11/2024

One son is debating himself on whether he would like to move to Wakanda or Gondor, and the other just informed us he shared a Google doc of his Christmas list with us.

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