Lightnews — Scholar-powered news

χle Ormsby @motivickyle.bsky.social · 49m

Tate: How about we splice together these resolutions to get an amalgamation of group cohomology and homology? It's a little ad hoc, but —

Nikolaus-Scholze: Hold our beers.

Theorem I.4.1 of https://arxiv.org/abs/1707.01799 giving an infinity-categorical universal property for Tate cohomology.

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χle Ormsby @motivickyle.bsky.social · 1h

Hell yes. Good job Sally and MIT!

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Laura Petto @laurarpetto.bsky.social · 1h

SALLY KORNBLUTH REJECTED THE COMPACT!! All MIT students and employees just got this email

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Eileen Clancy 🧿 @clancyny.bsky.social · 11h

He's a mathematician!

"The Portland Chicken—Jack Dickinson, 26, of Portland—started out protesting at the Tesla dealership, also on South Macadam Avenue, in February but has switched to the ICE building."

Willamette Week @wweek.com · 14h

Jack Dickinson, 26, says “we’re winning this.”

An Interview With the Portland Chicken

Rachel Saslow

www.wweek.com

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χle Ormsby @motivickyle.bsky.social · 11h

Hear me out: Tate cohomology.

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χle Ormsby @motivickyle.bsky.social · 17h

A "yes first, details later" deal in the Middle East will certainly work out, no problems. In fact, I'm completely unconcerned about the details — certainly no devils therein.

NYT headline: How Jared Kushner, a Self-Described ‘Deal Guy,’ Helped Broker a Gaza Breakthrough

Trained in New York City real estate, the president’s son-in-law had a single goal: Get to a yes first, and hash out the details later. “It’s just different being deal guys — just a different sport,” he said.

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χle Ormsby @motivickyle.bsky.social · 17h

I've toured Reed's reactor and one of the Nuclear Safety Administration rules is that an extra person always be present in case of an emergency. As such, there's always a student in the reactor control room wearing name badge reading "Warm Body".

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χle Ormsby @motivickyle.bsky.social · 20h

The local Fox affiliate just ran this story on a visit to the reactor: www.kptv.com/video/2025/1...

Reed College nuclear reactor visit

The Reed Research Reactor at Reed College in SE Portland, was established in 1968. Throughout that time, it has been a home for training, research and educational projects. One of the key components o...

www.kptv.com

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χle Ormsby @motivickyle.bsky.social · 20h

It's endlessly amusing to me that my office is a one-minute walk from a student-run nuclear reactor. What could go wrong???!?

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Dave Kung @dtkung.bsky.social · 1d

Always fun to see the amazing people who win. Congrats to mathematician Lauren Williams on winning a MacArther genius grant!

www.macfound.org/fellows/clas...

Lauren K. Williams

Uncovering transformative connections between algebraic combinatorics and problems in other areas of math and physics.

www.macfound.org

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Dave Richeson @divbyzero.bsky.social · 1d

New blog post! Through a sequence of images, I verify that the unknotting number of the connected sum of a (2,7) torus knot and its mirror is less than 6: I show that this first image is the connected sum, and after changing those crossings, it produces the unknot! divisbyzero.com/2025/10/08/t...

A drawing of the connected sum of a (2,7) torus knot and its mirror image (much modified).

An image of a crazy knot I claim is the unknot.

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χle Ormsby @motivickyle.bsky.social · 1d

The Active Calculus textbook just sent me down a fun rabbit hole.

Q: How do we know that the inverse to f(x) = x + sin(x) is not elementary?

A: Extended to the complex numbers, the inverse has infinitely many branch points!

Exercise 10 from https://activecalculus.org/single2e/sec-2-6-inverse.html.

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χle Ormsby @motivickyle.bsky.social · 1d

To be clear, this is a PDX post. Couch rhymes with hooch if you're talking about the street in NE Portland.

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χle Ormsby @motivickyle.bsky.social · 1d

Couch

Merriam-Webster @merriam-webster.com · 1d

What’s the word where you’re from that, when pronounced exactly as it looks, identifies a tourist immediately?

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χle Ormsby @motivickyle.bsky.social · 1d

If I were running an AI training company, I would probably try to name my company something that doesn't look like abbreviation of "Alignment Error".

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χle Ormsby @motivickyle.bsky.social · 1d

Hello? I'd like to report an attempted nerd-sniping by a targeted ad trying to pay me to teach algebraic topology to a neural net.

Targeted ad from reddit that says "If you can solve this, You belong at Alignerr. Earn up to $150/hr" and the problem is an octagon with sides identified in pairs and you're supposed to determine the genus of the associated surface.

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subvariety sarah @scgriffith.bsky.social · 1d

the citation is these talk slides www.jaist.ac.jp/~bjorner/ae-..., which include the following horrible image

GCC, maple, mathematica, pari and mupad giving dramatically different answers to sin(10^22)

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χle Ormsby @motivickyle.bsky.social · 2d

Neat! But I’m wondering: What does “surface area” mean at this scale?

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Carl Quintanilla @carlquintanilla.bsky.social · 2d

#WarRavagedPortland

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χle Ormsby @motivickyle.bsky.social · 2d

Excuse me. “Bongo Cat is the iconic, meow-singing cat that you will never forget after listening to one of her songs. Bongo Cat interprets current hits in her very special style and with enchanting animations.” www.kirine.me/meowing