Tien Chih

Over an article saying that Mamdani will be raising minimum wage for grocery delivery apps in NYC someone comments with a facepalm emoji and says "So if you have ADHD and live in a food desert... you should just... starve. Got it."

Can't now find it but there's a classic old tweet which said something like "Every time we're on the verge of achieving class consciousness in America a CIA sleeper agent activates and, their eyes glowing red, they just tweet out "John Brown was a white saviour"" and I think about it often.

Comprehensive presentation of the "Theorem of the Day", starting with a statement of this theorem. The Max-Flow Min-Cut Theorem : Let N = (V, E, s, t) be an st-network with vertex set V and edge set E, and with distinguished vertices s and t. Then for any capacity function c : E → R≥0 on the edges of N, the maximum value of an st-flow is equal to the minimum value of an st-cut.

Theorem of the Day (February 2, 2026) : The Max-Flow Min-Cut Theorem
Source : Theorem of the Day / Robin Whitty
pdf : buff.ly/qzNUAp8
notes : buff.ly/bC57Zl2

#mathematics #maths #math #theorem

In the meantime linopt.tienchih.org

It's almost there! One last sweep and then I want my students to handle it to see if they like these dimensions.

\epsilon \mapsto \epsilon/2.

Project update:
Tanya and I have been writing up the results of this project and we've realized that all of the knots in this class of patterns are at most 6 "tangle moves" from each other and at most three tangle moves from what we're calling the "great-great-granny knot" (see alt text).

Several tables of high school students are solving puzzles

Cover to a puzzle booklet. The caption is Where In The World is Cameron San Francisco? There's a briefcase with an illustration vaguely similar to Carmen San Diego

Table of prizes: Blokus, Tetris the Board Game, Thinking Putty Puzzle

Lots of fun at the first #MaPPChallenge this year across the country, here in Mobile, AL hosted by SouthAlabama.edu and Bishop.edu!

Learn how to bring fun math research inspired puzzles to your campus at MaPPmath.org!

Anyone know if the NSF postdoc offers have come out yet?

#MathSky

This! In my IBL materials, I started prefacing proofs with a scaffolded “do the steps of the proof to this generic example” activity.

“Something something seeds of generality something.” -David Hilbert

The biggest risk in this moment is something sociologists call “symbolic compliance.”

That’s when an institution that is violating civil rights gives the public just enough symbolic victories that accountability efforts lose steam before there has been any meaningful change.

Commutative triangle expressing one arrow as the composite of the other two.

My self-evaluation is due Friday, so instead I figured out how to use the 'network' features of PreFigure to draw commutative diagrams in #PreTeXt. prefigure.org/docs/sec-net...

Of course they’re not welcome.

This is unreal, even for a normal government, who empowers a foreign police force to have jurisdiction of any sort?

If CNN reporters don't know the word sycophant, it would explain a lot.

Our countertop and cabinets have the same design. Are you my neighbor?

PMP wrote a statement about it as well.

bsky.app/profile/pris...

Petition: Christopher Havens is an inmate in the Washington state prison system who has been collaborating on mathematics with people both inside and outside prison. He was recommended for clemency by the parole board. However, governor Bob Ferguson has not granted it yet. (link below)

To all who teach matrices/linear algebra, I highly recommend vol. 24, issue 1 (Jan. 1993) of The College Mathematics Journal, a special issue dedicated to the teaching of linear algebra. Different ways of interpreting matrix multiplication is one of the themes of the issue.

The dead man was a Minnesotan filming on a Minnesota street.

The ICE and Border Patrol agents were flown to the state en masse to round up black and brown people at random, "injecting themselves where they do not need to be."

Me: *looking through shoes on Netflix*

👹: “Oh, Bojack Horseman, he’s cool right?”

Me: “………………………NO.”

A confused and stinky dog on a patio covered in ice looking backwards.

Mya slipped a bit on the patio stairs going into the yard, then she looked back at me like *I* put the ice there.

once again startling how people who ostensibly believe in the so-called "right to bear arms" also simultaneously profess to believe the directly contradictory belief that carrying a firearm is sufficient grounds for summary execution

Stay warm this weekend!

As the semester picks up, if there are elements in your courses you would like to be free/accessible/interactive, then #PreTeXtGang may be your answer! Please join me, @chrissysafranski.bsky.social @clontz.org and @oscarlevin.com 12-1 Eastern each ThF for drop-in office hours! mathtech.org/events/

I'm new to codespaces. So new that I just figured out that ⌘+→ will take me to the end of the tag I'm currently writing. What other tricks should I learn?

Mine is "symmetrical sniffle".

They like cops so much that all we’re getting is cops. No roads, no bridges, no school funding, no culture money, just a bouquet of different types of cops

One of the reasons I am so insistent that everyone remember that only 22% of the US population voted for Trump is that the Christian Nationalists want the myth of a mandate in circulation.

We need to reject it. They never had a mandate, and their coalition is shrinking.