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@arXiv_mathAG_bot@mastoxiv.page
2025-09-17 08:50:29

The pseudoautomorphism group of $\mathbb{P}^3$ blown-up at $8$ very general points
C\'ecile Gachet
arxiv.org/abs/2509.12977 arxiv.org/p…

The pseudoautomorphism group of $\mathbb{P}^3$ blown-up at $8$ very general points
We prove that the pseudoautomorphism group of a blow-up of $\mathbb{P}^3$ at $8$ very general points is trivial. We also establish the injectivity of the Coble representation associated to blow-ups of $\mathbb{P}^3$ at $r\ge 8$ general points, answering a question of Dolgachev--Ortland.

@arXiv_mathph_bot@mastoxiv.page
2025-07-17 09:13:40

Pseudodifferential Weyl calculus on vector bundles
Lars Andersson, Benjamin Moser, Marius A. Oancea, Claudio F. Paganini, Gabriel Schmid
arxiv.org/abs/2507.11965

Pseudodifferential Weyl calculus on vector bundles
We develop a geometric framework for Weyl quantization on pseudo-Riemannian manifolds, in which pseudodifferential operators act on sections of vector bundles equipped with arbitrary connections. We construct the associated star product and compute its semiclassical expansion up to third order in the expansion parameter. A central feature of our approach is a one-to-one correspondence between formally self-adjoint symbols and formally self-adjoint operators, extending known results from flat sp…

@cdarwin@c.im
2025-07-17 20:29:06

The president posted a furious rant on Truth Social Tuesday, saying that any of his followers who were interested in the Epstein case were falling for Democratic “bullshit,”
and compared it to the “totally fake and made up story used in order to hide Crooked Hillary Clinton’s big loss in the 2016 Presidential Election.”
Similarly to Russia’s interference in the 2016 election, Trump now claims that Epstein files are a “hoax.”
Unfortunately for Trump, Americans don’t care abou…

Panicked Trump Rushes to Create a Distraction From Epstein Files
Donald Trump is throwing everything at the wall and hoping something sticks.

@axbom@axbom.me
2025-09-17 12:54:55
@…

Betänk nu att jag postade den här, och kom på att jag ville använda den i min presentation. Men på svenska. Så jag spårade upp vilket avsnitt av My Little Pony det handlade om, sökte fram för att hitta scenen. Laddade ner klippet från YouTube och klippte ut kramen. La på svensk text och exporterade för användning i min Ke…
@ErikJonker@mastodon.social
2025-08-13 08:58:56

Think about this, China manufactures around:
85% of the world’s solar panels
80% of batteries
68% of wind turbines
70% of electric vehicles, and
65% of energy storage systems

I posted the same solar facts on two social media platforms: One sparked discussion, the other, disinformation
One hundred solar panels per second reflects extraordinary technical progress. A platform that simply fosters noise over truth does not.

@jake4480@c.im
2025-09-17 17:33:35

Apparently I'm basically the only one using the #DungeonCrawlers hashtag, but that's okay, because scrolling it is a pretty cool look back at the games I've played and dug.
Roundup of the games I've posted screenshots/brief reviews of on the #DungeonCrawlers hashtag since 2023, with …

DemonsTier on Steam
From the union of Riddled Corpse and Xenon Valkyrie comes Demonstier, an RPG roguelike with elements of action, adventure, & arcade. Enter the dungeons of king Thosgar & destroy the demonic beings present there .

@stsquad@mastodon.org.uk
2025-09-18 09:34:34

It's been awhile since I've posted a #jonathanpie video. I'm not terminally online but even on the fediverse you get some backscatter from regular social media channels. I do wonder how much is genuine division and how much is a relatively small number of people and an army of bots wedging them apart:

@karlauerbach@sfba.social
2025-09-18 15:58:26

I would suspect that many birth-citizenship US citizens could not pass this citizenship test.
(I note that the USCIS website for citizenship test materials has many items blocked by Privacy Badger and Ublock Origin - in other words, the website has trackers, some of which are private companies.)
Just read the hogwash in this announcement:
"“American citizenship is the most sacred citizenship in the world and should only be reserved for aliens who will fully embrace our…

USCIS Unveils First Changes to Naturalization Test in Multi-Step Overhaul of American Citizenship Standards
Today, U.S. Citizenship and Immigration Services posted a Federal Register notice announcing implementation of the 2025 naturalization civics test.

@cdarwin@c.im
2025-09-17 14:05:10

Ben & Jerry’s co-founder Jerry Greenfield is leaving the ice cream brand after 47 years, saying that
the independence it once had to speak up on social issues has been stifled by parent company Unilever
apnews.com/article/ben-jerrys-

Why Jerry Greenfield is leaving Ben & Jerry's after 47 years
Ben & Jerry’s co-founder Jerry Greenfield is leaving the ice cream brand after 47 years, saying the freedom the company used to have to speak up on social issues has been stifled by corporate parent Unilever. Co-founder Ben Cohen posted Greenfield's letter on social media platform X on Greenfield’s behalf. Greenfield said that he felt the independence the brand had to speak on social issues and events was lost to Unilever.