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Matthew Cushman

@astragalus

Adjunct math prof at Hunter College in NYC. Lefty. Kindness is the only thing that matters.

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Latest posts by Matthew Cushman @astragalus

I'm one of those! I yearn for my ancestral homeland, half-Korea

03.03.2026 21:35 πŸ‘ 3 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
Iran is mountainous

Iran is mountainous

OpenAI led ground invasion of a place whose terrain looks like this will surely be a great success

02.03.2026 18:50 πŸ‘ 1158 πŸ” 130 πŸ’¬ 52 πŸ“Œ 14

SCIF now stands for β€œSome Curtains In Front”

01.03.2026 01:39 πŸ‘ 1713 πŸ” 269 πŸ’¬ 18 πŸ“Œ 4
Tweet on X by Amir Kiyae reads: 

Strikes on Iran appear to have hit the home where opposition leaders Mir-Hossein Mousavi and Zahra Rahnavard have been held under house arrest - both are reported safe, but their residence was damaged. Former President Ahmadineiad's home was also targeted. Israel has stated it is targeting Iranian leaders "past, present, and future." This follows previous Israeli strikes on Evin Prison. Draw your own conclusions,

Tweet on X by Amir Kiyae reads: Strikes on Iran appear to have hit the home where opposition leaders Mir-Hossein Mousavi and Zahra Rahnavard have been held under house arrest - both are reported safe, but their residence was damaged. Former President Ahmadineiad's home was also targeted. Israel has stated it is targeting Iranian leaders "past, present, and future." This follows previous Israeli strikes on Evin Prison. Draw your own conclusions,

Home of reformist opposition leaders from 2009 Green Movement, Mir-Hossein Mousavi and Zahra Rahnavard was also hit by Israeli/US strikes. They have been under house arrest by the regime for over a decade.

28.02.2026 21:53 πŸ‘ 1391 πŸ” 564 πŸ’¬ 17 πŸ“Œ 110
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BREAKING β€” 51 Iranian children are dead after a strike hits Minab girls elementary school in Iran.

28.02.2026 12:33 πŸ‘ 3120 πŸ” 2019 πŸ’¬ 161 πŸ“Œ 741
Palestinian villagers - a man, a woman and a baby, and a young child, raising holding their hands in the air, probably as they are forced to leave their village. Photograph taken by a Israeli soldier. Source: Haaretz/Akevot

Palestinian villagers - a man, a woman and a baby, and a young child, raising holding their hands in the air, probably as they are forced to leave their village. Photograph taken by a Israeli soldier. Source: Haaretz/Akevot

Haaretz @haaretzcom.bsky.social with Akevot @akevabanshee.bsky.social report on a trove of archival documents, with granular detail on atrocities committed in the 1948 Nakba. Ground level documentation by soldiers demonstrate the pervasive nature of murder and expulsion of Palestinian civilians.

27.02.2026 09:56 πŸ‘ 97 πŸ” 53 πŸ’¬ 3 πŸ“Œ 6

I guess this is related to the fact that you run into cohomology naturally when studying infinitesimal deformations? I know that Goodwillie calculus gives a sense in which (parameterized) spectra form tangent spaces to an infinity topos. Does this specialize to deformation theory?

26.02.2026 17:34 πŸ‘ 2 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

Ah Deutsche Bank. Its reputation for sleaze is so well-deserved.

26.02.2026 01:52 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Maybe it has something to do with the way things are structured into generic/robust phenomena vs degenerate/perturbation-unstable phenomena. I'm thinking about eg intersection theory and how passing to cohomology is like assuming transversality of intersecting representatives

25.02.2026 16:28 πŸ‘ 6 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
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very important video please watch

23.02.2026 20:11 πŸ‘ 7268 πŸ” 2568 πŸ’¬ 127 πŸ“Œ 264
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One of the greatest bollard walks in history.
#WorldBollardAssociation

22.02.2026 13:23 πŸ‘ 5566 πŸ” 1250 πŸ’¬ 72 πŸ“Œ 109

Linear algebra is a psyop by Big Field to make people think all modules are free

20.02.2026 20:37 πŸ‘ 10 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
19.02.2026 13:10 πŸ‘ 3017 πŸ” 821 πŸ’¬ 28 πŸ“Œ 17

Try being murdered lol

18.02.2026 18:22 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
Preview
Turkish Lentil Soup (Mercimek Γ‡orbasΔ±) Turkish Red Lentil Soup (KΔ±rmΔ±zΔ± Mercimek Γ‡orbasΔ±) is velvety, comforting, and nutritious! Plus, it’s so easy to make with lentils, veggies, and spices!

Hah! I literally just made the lentil soup (which I have been thinking about since I got back from Turkey lol). Here's the recipe I used. I'm eating it right now and it tastes exactly the same. I found the pul biber at whole foods ("silk chili") www.themediterraneandish.com/turkish-lent...

16.02.2026 00:26 πŸ‘ 4 πŸ” 0 πŸ’¬ 2 πŸ“Œ 0
a drawing of a head shown in different positions. a lot of them. i mean a lot

a drawing of a head shown in different positions. a lot of them. i mean a lot

learn how to draw heads with the loomis method then apply it by doing something like this in your preferred style. you will Learn

14.02.2026 21:55 πŸ‘ 447 πŸ” 67 πŸ’¬ 6 πŸ“Œ 4

well i for one couldn’t be more excited for the possibilities of AI. finally a technology that answers the age old question β€˜what if clippy was wormtongue’

12.02.2026 13:10 πŸ‘ 2553 πŸ” 544 πŸ’¬ 15 πŸ“Œ 6

discord: please verify your age

me: *lets out a sigh that seems to crawl out of my lungs rather than be exhaled, dense with fatigue, disappointment, so profoundly Gen X it practically hums with the ghosts of mixtapes, dial-up modems, and being told to β€œjust deal with it”*

discord: age verified

10.02.2026 13:37 πŸ‘ 130 πŸ” 40 πŸ’¬ 2 πŸ“Œ 1
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Hunderfossen Adventure Park in Norway (Rauraggen)

10.02.2026 04:25 πŸ‘ 638 πŸ” 139 πŸ’¬ 25 πŸ“Œ 71
A musician playing a guitar in sugarcane that is somehow in the middle of a football field

A musician playing a guitar in sugarcane that is somehow in the middle of a football field

First shot: sugarcane

The backbone of Puerto Rico's agricultural economy since colonial times

Still used to make rum of course!

09.02.2026 02:33 πŸ‘ 3627 πŸ” 629 πŸ’¬ 35 πŸ“Œ 285
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The Sermon on the Mount, by Beryl Lewis, before 1965, πŸ“Έ by @ScottStrazzante

09.02.2026 02:16 πŸ‘ 11996 πŸ” 2661 πŸ’¬ 58 πŸ“Œ 64

Exit polls show socialist Antonio Jose Seguro has crushed the Far Right candidate Andre Ventura in Portugal’s presidential runoff.

08.02.2026 20:20 πŸ‘ 2661 πŸ” 519 πŸ’¬ 88 πŸ“Œ 35

Thank God!! I was just there and saw all the racist "this is not Bangladesh" signs everywhere. Glad that piece of shit got stomped down. Portuguese people have always struck me as collectively very level-headed.

08.02.2026 21:15 πŸ‘ 12 πŸ” 1 πŸ’¬ 1 πŸ“Œ 0

[watching curling]
after 1 min: ugh this is dull
10 min: spin on that stone is off
30 mins: three in the house means nothing if your centre guard is ripe for a pick and roll
1 hour: SWEEP BITCH SWEEP

07.02.2026 14:51 πŸ‘ 604 πŸ” 116 πŸ’¬ 10 πŸ“Œ 8
1. Coinage of the Meeting and Docket Conflux (5 minutes)

1. Coinage of the Meeting and Docket Conflux (5 minutes)

web.archive.org/web/20240224...

06.02.2026 01:16 πŸ‘ 27 πŸ” 5 πŸ’¬ 1 πŸ“Œ 9

Now watch as the Dems cave on these demands one by one

05.02.2026 03:11 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

As a recent PhD and adjunct teaching faculty at a public inner city college in the US I can attest that the general vibe is that of the musicians on the Titanic: we do what we can almost as an act of rebellion but we all know the ship is going down.

04.02.2026 22:18 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

worth noting that the second rich people stopped being afraid of mobs tearing them limb from limb, they stopped building libraries and opera houses and stuff and started ripping the copper wiring out of the walls of society instead

04.02.2026 16:44 πŸ‘ 19783 πŸ” 5960 πŸ’¬ 19 πŸ“Œ 79

Sorry to derail the thread but these are really nice notes! Do you know if there is any connection between quadratic forms/grothendieck-(a certain nazi) rings and Clifford algebras/topological K-theory rings? Just because both involve quadratic spaces.

03.02.2026 23:11 πŸ‘ 2 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
Error: entity released

Error: entity released

...horrifying message without context, thank you

02.02.2026 10:42 πŸ‘ 5489 πŸ” 1969 πŸ’¬ 51 πŸ“Œ 90