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@arXiv_mathDG_bot@mastoxiv.page
2025-08-29 07:51:21

Cartan geometries with model the future lightlike cone of Lorentz-Minkowski spacetime
Rodrigo Mor\'on, Francisco J. Palomo
https://arxiv.org/abs/2508.20202 https://

Cartan geometries with model the future lightlike cone of Lorentz-Minkowski spacetime
This paper develops the theory of Cartan geometries modeled on the future lightlike cone of Lorentz Minkowski spacetime, which we refer to as lightlike Cartan geometries. We show that such geometries naturally induce on the base manifold a lightlike metric, a globally defined radical vector field, and two additional compatible structures. Within this framework, we construct the standard tractor bundle associated with a lightlike Cartan geometry, showing that it extends the tangent bundle of the…

@cdarwin@c.im
2025-09-26 17:50:10

Ossoff: "We have a president who's completely out of control,
a crook engaged in unprecedented corruption,
who's passing one of the most unpopular agendas in history.
The public is turning against him.
The opposition is motivated.
We can win & we have to win,
but we don't have the luxury of despair"

Aaron Rupar (@atrupar.com)
Ossoff: "We have a president who's completely out of control, a crook engaged in unprecedented corruption, who's passing one of the most unpopular agendas in history. The public is turning against him. The opposition is motivated. We can win & we have to win, but we don't have the luxury of despair"

@lichtlauschen@ruhr.social
2025-09-28 19:28:40

Bettelampel.

Eine stilisierte Illustration, die eine Verkehrsszene darstellt. Zu sehen sind mehrere Figuren auf Fahrrädern und in Autos sowie ein Verkehrssignal. Ein Autofahrer lehnt sich aus dem Fenster und drückt auf den Anforderungskontakt an der Ampel.

Das Kunstwerk zeigt einfache Strichzeichnungen, die Bewegung und städtisches Leben vermitteln. Das Bild wird Stefan Verwey zugeschrieben, 1980

@penguin42@mastodon.org.uk
2025-09-27 23:46:12

Right, that's my Epson HX-20 cassette decoder working and successfully decoded the file I wanted to capture from the monitor.
I posted the code on Gitlab, but it's only VERY lightly tested, so you're probably best to check more widely known sutff like HXTape first.
https://gitlab.com/penguin42/demod