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@arXiv_mathCO_bot@mastoxiv.page
2025-10-01 08:56:47

Signless Laplacian characterization of cones over disjoint unions of cycles, edges and isolated vertices
Jiachang Ye, Jianguo Qian, Zoran Stanic
arxiv.org/abs/2509.25925

Signless Laplacian characterization of cones over disjoint unions of cycles, edges and isolated vertices
Two graphs are said to be $Q$-cospectral if they share the same signless Laplacian spectrum. A simple graph is said to be determined by its signless Laplacian spectrum (abbreviated as DQS) if there exists no other non-isomorphic simple graph with the same signless Laplacian spectrum. In this paper, we establish the following results: (1) Let$G \cong K_{1} \vee \bigl(C_{k} \cup qK_{2} \cup sK_{1}\bigr),$ with $q,s \geq 1$, $k \geq 4$, and at least $21$ vertices. If $k$ is odd, then $G$ is DQS.…

@Techmeme@techhub.social
2025-12-28 07:01:04

Sources: Bengaluru-based quick grocery delivery startup Zepto confidentially files for a ~$1.3B India IPO; Zepto raised $450M at a $7B valuation in October 2025 (Pranav Mukul/The Economic Times)
economi…

Zepto makes confidential filing with Sebi for $1.3 billion IPO: sources
The listing is planned for the July-September quarter of 2026. In October, the quick commerce major had closed a $450 million round, valuing it at $7 billion. As of late November, Zepto had around Rs 7,000 crore in cash, while competitors Eternal and Swiggy each have around Rs 17,000-18,000 crore on their books currently.

@cdarwin@c.im
2025-12-30 20:29:33

All worry is laid to waste.
The endorphins rushing wild from the freezing water,
the music pounding through my body,
the caffeine,
the fucking ducks and the God-roiling sky
– no what-ifs,
no yeah-buts,
no what-abouts, 
no caveats, at all.
I am made happy,
and that happiness is entire and incontestable.
And all the way home, I go
— to my beautiful waking wife
– on this, the best day ever.
Love, Nick Cave

Nick Cave - The Red Hand Files - Issue #344 - Which song comes to mind when you are genuinely joyful? I mean, carefree, energy flowing, dancing, moving, kind of happy?
Dear Marianne, This morning, I got up at five, I couldn’t sleep, I’d fretted about this and I’d fretted about that. The night had played...

@tiotasram@kolektiva.social
2025-11-27 18:02:38
Content warning: Cooking & food

Just finished round 1 of #Thanksgiving cooking.
I have extremely mixed feelings these days about a holiday founded on genocide (seriously, official Thanksgiving #1 was "hooray we killed these natives, let's celebrate" which is deeply ironic/horrific given that the whitewashed origin story also did happen years earlier). But I'm a big fan of cooking and feasting, so that's what I focus on.
I'm vegetarian so no turkey.
I made "chiraji sushi" in my heavily bastardized personal style, as well as vegetarian stuffing. Both were pretty successful, although I truly regret forgetting to put nuts in the stuffing. I ended up using "smoky chipotle" flavor "better than bouillon" for the stuffing soup base, which pairs surprisingly well with the chopped persimmons. I tried doing microwave -> pan fry -> bake for the potatoes and carrots, and while they turned out good, they weren't as amazing as I'd hoped for.
The sushi (with stir-fried carrots, onions, mushrooms, and peas, plus fried tofu chunks and fresh cucumber and canned corn) turned out excellent.
Now I just need to decide what to have thirds of.

@raiders@darktundra.xyz
2025-11-24 02:27:29

Raiders’ Geno Smith Drops True Feelings After Loss to Browns heavy.com/sports/nfl/las-vegas]

Raiders’ Geno Smith Drops True Feelings After Loss to Browns
The Las Vegas Raiders let a good chance slip away, falling 24-10 to the Cleveland Browns on November 23 at Allegiant Stadium despite matching up against rookie quarterback Shedeur Sanders.For Las Vegas, they again went pass-heavy, as Geno Smith completed 30 of 44 passes for 285 yards and one touchdown. Nonetheless, that decision from offensive coordinator Chip Kelly came at a cost: The offensive line allowed 10 sacks.Moreover, Smith’s drop-back passes didn’t result in more points, as the R…

@cdarwin@c.im
2025-11-28 07:32:05

Flying drones used during the Ukraine war have changed land battle tactics for ever.
Now the same thing appears to be happening under the sea.
Navies around the world are racing to add autonomous submarines.
theguardian.com…

‘A step-change’: tech firms battle for undersea dominance with submarine drones
As navies seek to counter submarines and protect cables, startups and big defence companies fight to lead market

@Dragofix@veganism.social
2025-11-13 20:28:52

Want to make America healthy again? Stop fueling climate change #America

Want to make America healthy again? Stop fueling climate change
If you've been following recent debates about health, you've been hearing a lot about vaccines, diet, measles, Medicaid cuts and health insurance costs—but much less about one of the greatest threats to global public health: climate change.

@floheinstein@chaos.social
2025-11-23 09:23:23

Wenn du so in die World-Timeline blickst und denkst "Es wird nichts gepostet seit Stunden. Hab ich die Entrückung verpasst?", dann auf die lokale Instanz chaos.social gehst und merkst "Nur noch nette Leute hier. War wohl wirklich Entrückung."

@leftsidestory@mstdn.social
2025-11-23 00:34:17

Moody Urbanity - Past 📴
情绪化城市 - 过去 📴
📷 Zeiss Ikon Super Ikonta 533/16
🎞️ Ilford HP5, expired 1993
#filmphotography #Photography #blackandwhite

Ilford HP5 Plus 400 (6x6) English Alt Text A black-and-white photo of a traditional Chinese gate with ornate carvings and layered roof tiles. The gate bears the characters “成贤街” (Chengxian Street), indicating a culturally significant location. The structure is symmetrical, with decorative beams and eaves typical of classical Chinese architecture. In front of the gate, a modern traffic sign shows a crossed-out car symbol, indicating that cars are prohibited. The juxtaposition of ancient design a…
Ilford HP5 Plus 400 (6x6) English Alt Text A vintage black-and-white photo of a traditional East Asian building. The roof features cylindrical tiles in overlapping rows, typical of Chinese architecture. Below the roof, a large arched doorway and a circular window with intricate carvings are visible. Tree branches hang in the foreground, partially obscuring the roof. The image has visible grain and wear, suggesting it is archival. The scene is quiet and timeless, evoking cultural heritage and a…
Ilford HP5 Plus 400 (6x6) English Alt Text A monochrome photo shows a man standing beside a stroller on a sidewalk. He holds a helmet and faces a wall with Chinese characters reading “消防通道 禁止停车” (Fire Apparatus access route. No parking). The wall is flanked by traditional architectural elements and trees, suggesting a historical urban setting. A cyclist passes by in the foreground, blurred in motion. The contrast between stillness and movement adds depth. The man’s posture is relaxed, and the …
Ilford HP5 Plus 400 (6x6) English Alt Text A black-and-white photo of an old brick wall featuring an arched doorway and a decorative window. The doorway is worn and partially damaged, while the window has ornate carvings. Stone steps lead up to the entrance. A bicycle leans against the wall to the right, adding a modern contrast. A striped concrete block sits in the foreground. The scene blends historical architecture with everyday urban life, evoking a sense of quiet nostalgia. 中文图像替代文字 这是一张…
@Techmeme@techhub.social
2025-12-25 21:20:32

Apple settles with Brazil's regulator to allow alternative app stores; report: Apple will charge a 5% fee for alt app stores and 15% on App Store linkouts (Hartley Charlton/MacRumors)
macrumors.com/2025/12/24/new-a

Apple to Introduce New App Store Fee Structure in Brazil Following Antitrust Settlement
Brazilian regulators have approved a settlement that will require Apple to change how the App Store operates on iPhone in the country, including...