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Philipp Birken

@philippbirken.fediscience.org.ap.brid.gy

26 followers 9 following 203 posts

Mathematician at Lund University, works on Scientific Computing for a sustainable world. I used to be very active on the german Wikipedia, and in […] [bridged from fediscience.org/@philippbirken on the fediverse by fed.brid.gy ]

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Philipp Birken @philippbirken.fediscience.org.ap.brid.gy · 10h

The dump of 722 preprints on github by OpenAI on solutions to open mathematical problems does not mention numerical analysis. Nevertheless, there is one that is of relevance, namely about the complexity of matrix-matrix multiplications of square matrices. The preprint claims to prove that this […]

fediscience.org

Original post on fediscience.org

Reposted by Philipp Birken

Kris @isotopp.infosec.exchange.ap.brid.gy · 18h

finopsllm.com/research/codex-usage-… Wie doll ist eine ChatGPT Subscription subventioniert? $20 pro Monat -> $67 API Usage pro Woche, mit 4.5 Wochen pro Monat sind das also grob Faktor 15 oder 1500%. Sollte man im Kopf behalten, wenn man den Börsengang diskutiert.

Table with four columns: Plan, Price / month, Codex API $ per week, and Basis.

It compares three plans' monthly subscription cost against an estimated weekly spend on Codex API usage.

Row 1: ChatGPT Plus — $20 per month; $67 per week on Codex API; Basis: Measured.

Row 2: ChatGPT Pro 5x — $100 per month; approximately $335 per week on Codex API; Basis: Plus × 5, projected.

Row 3: ChatGPT Pro 20x — $200 per month; approximately $1,340 per week on Codex API; Basis: Plus × 20, projected.

Main takeaway: the Plus tier's weekly API figure is a measured value, while the Pro 5x and Pro 20x weekly figures are projections scaled up from the Plus tier (5× and 20× respectively).

Monthly prices step up from $20 to $100 to $200 across the three plans.

Reposted by Philipp Birken

Frederik Mallon @freddy.volksverpetzer.de · 02/10/2026

Vielleicht der wichtigste Fakten-Snack diese Woche: Kostenvergleich zwischen D-Ticket, Tankrabatten und anderen Steuervergünstigungen für den individualisierten und Flugverkehr. Grafik von @correctiv.org @sebastianhaupt.bsky.social

Säulendiagramm mit verschiedenen Verkehrssubventionen und wie viel sie kosten (durch Zahlungen oder verminderte Steuereinnahmen):

Deutschland-Ticket: 3 Mrd. Euro
Tank-Rabatt: 4,1 Mrd. Euro (Mai-Juni und Oktober-Dezember addiert)
Dienstwagenprivileg: 4,2 Mrd. Euro
Pendlerpauschale: 5 Mrd. Euro
Dieselprivileg: 7-8 Mrd. Euro
Steuerbefreiung Kerosin: etwa 8 Mrd. Euro

Reposted by Philipp Birken

Daniel Lakeland @dlakelan.mastodon.sdf.org.ap.brid.gy · 01/10/2026

Fediverse, the social media system for 40+ year old people who built the world wide web and regret it.

Reposted by Philipp Birken

Philipp Birken @philippbirken.fediscience.org.ap.brid.gy · 23/09/2026

@TammyKolda and Daniel Appelö (who visited Lund this summer), have crunched the arxiv submission numbers. They are up a massive 40% over all disciplines compared to a year before (august 26 vs august 25), but in math they are up 70%! This rise is mostly in the past few months, correlating with […]

fediscience.org

Original post on fediscience.org

Reposted by Philipp Birken

Carl Heath @carl.heath.social.ap.brid.gy · 23/09/2026

Ryska attacker förstör böcker, lager och tryckerier. Samtidigt skickar civila böcker till soldater vid fronten, ibland sista biten med drönare. Om kultur, motståndskraft och läsning i krig. carlheath.se/en-bok-nedslappt-med-d…

En bok nedsläppt med drönare

En av fem texter om Cultural Forces, ett förband inom Ukrainas försvarsmakt där soldaterna arbetar med konst, musik, litteratur och minne. Texterna bygger på ett besök i Kyjiv i september 2026 och…

Philipp Birken @philippbirken.fediscience.org.ap.brid.gy · 23/09/2026

@TammyKolda and Daniel Appelö (who visited Lund this summer), have crunched the arxiv submission numbers. They are up a massive 40% over all disciplines compared to a year before (august 26 vs august 25), but in math they are up 70%! This rise is mostly in the past few months, correlating with […]

fediscience.org

Original post on fediscience.org

Reposted by Philipp Birken

Ruth Mottram @ruth-mottram.fediscience.org.ap.brid.gy · 21/09/2026

Good morning all, for those of you who missed it last week, here's the last call on what wordpress informs me is my 💯 th post... We've been measuring the loss of the Greenland and Antarctic ice sheets for half a century now, read on for what we have discovered […]

fediscience.org

Original post on fediscience.org

Reposted by Philipp Birken

Philipp Birken @philippbirken.fediscience.org.ap.brid.gy · 16/09/2026

@leanderlindahl Fairphone with murena e OS, which you helped me pick and which reminds me to write.a short review abouy how awesome it is. So here it is: Everything works! Very Good camera (not great!)! it's awesome! Only thing I found that does not work: I can not cast to Google Chromecast […]

fediscience.org

Original post on fediscience.org

Philipp Birken @philippbirken.fediscience.org.ap.brid.gy · 16/09/2026

Hej då Tidö, auf nimmer wiedersehen!

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Reposted by Philipp Birken

Kris @isotopp.infosec.exchange.ap.brid.gy · 14/09/2026

blog.koehntopp.info/2026/09/14/sie-… Worin wir den "AI Entwicklungsstop und verschobenen OpenAI Börsengang aus Sicherheitsgründen" beleuchten und deutlich machen, daß es nicht um Sicherheit geht, sondern um Geld, den absehbar scheiternden AIaaS-Markt […]

infosec.exchange

Original post on infosec.exchange

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Kris @isotopp.infosec.exchange.ap.brid.gy · 13/09/2026

Vor vielen Jahren einmal, ich lebte noch in Kiel, gab es in Kiel den Multimedia Campus, MMC. Das war im Grunde gar keine doofe Idee. Man wollte dort Postgrad-Ausbildung machen, in der man Business-Menschen IT beibrachte, und IT-Menschen Business. Ich war mit noch jemandem als Vertreter der […]

infosec.exchange

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Philipp Birken @philippbirken.fediscience.org.ap.brid.gy · 11/09/2026

Gestatten, meine Frau Urgoßmutter. SWR Retro - Politik und Zeitgeschehen · Die Rundfunkpionierin Sophie Tschorn erzählt · Podcast in ARD Sounds www.ardsounds.de/episode/urn:ard:ep…

Podcast: Die Rundfunkpionierin Sophie Tschorn erzählt

Sophie Tschorn fuhr im Jahr 1924 zum neu gegründeten Süddeutschen Rundfunk und bot dem Intendanten kurz entschlossen an, eine Kindersendung zu moderieren. Er sagte zu. Und so begann die langjährige Radio-Karriere von Sophie Tschorn alias "Gretle von Strümpfelbach".

Reposted by Philipp Birken

Ola Spännar @olaspannar.bsky.social · 12/09/2026

10 klimatbeslut från Tidöregeringen – en påminnelsetråd 🧵 1. Miljödepartementet lades ned Tidöregeringen nedmontering av Sveriges klimat- och miljöpolitik symboliseras kanske tydligast med att det första de gjorde var att stänga Miljödepartementet www.di.se/hallbart-nar...

Miljödepartementet skrotas – ”förödande konsekvenser”

Ulf Kristerssons nya regering lägger ner miljödepartementet. Istället ska frågorna inordnas under klimat- och näringslivsdepartementet.

Philipp Birken @philippbirken.fediscience.org.ap.brid.gy · 11/09/2026

Gestatten, meine Frau Urgoßmutter. SWR Retro - Politik und Zeitgeschehen · Die Rundfunkpionierin Sophie Tschorn erzählt · Podcast in ARD Sounds www.ardsounds.de/episode/urn:ard:ep…

Podcast: Die Rundfunkpionierin Sophie Tschorn erzählt

Sophie Tschorn fuhr im Jahr 1924 zum neu gegründeten Süddeutschen Rundfunk und bot dem Intendanten kurz entschlossen an, eine Kindersendung zu moderieren. Er sagte zu. Und so begann die langjährige Radio-Karriere von Sophie Tschorn alias "Gretle von Strümpfelbach".

Reposted by Philipp Birken

Philipp Birken @philippbirken.fediscience.org.ap.brid.gy · 09/09/2026

As a math professor working in computational fluid dynamics, here a few thoughts on the news about the Millenium problem related to Navier-Stokes. i) I never really understood why this particular question about global regularity of solutions made it into the seven millenium problems. There was […]

fediscience.org

Original post on fediscience.org

Philipp Birken @philippbirken.fediscience.org.ap.brid.gy · 09/09/2026

As a math professor working in computational fluid dynamics, here a few thoughts on the news about the Millenium problem related to Navier-Stokes. i) I never really understood why this particular question about global regularity of solutions made it into the seven millenium problems. There was […]

fediscience.org

Original post on fediscience.org

Reposted by Philipp Birken

Philipp Birken @philippbirken.fediscience.org.ap.brid.gy · 05/09/2026

Humble Bundle has a C J Cherryh book offer. She is one of my favourite authors, very prolific and quite underrated, even given that she won two Hugo awards along time ago. Now, her style is not everybodys. She uses stream of conciousness of the main character and so it is very dialogue heavy […]

fediscience.org

Original post on fediscience.org

Reposted by Philipp Birken

Carl Heath @carl.heath.social.ap.brid.gy · 05/09/2026

Jag tänkte och skrev av mig en sväng i mera terapeutiskt syfte efter att ha lyssnat på Ekots Lördagsintervju och dagens AI-politiska dematt. carlheath.se/da-ar-loppet-redan-kor…

”Då är loppet redan kört” - en reflektion efter Ekots AI-debatt

”Om det nu skulle vara så, då är loppet redan kört.” Meningen kom från civilminister Erik Slottner, kristdemokrat och ansvarig för digitaliseringen, i morse i Ekots lördagsintervju…

Philipp Birken @philippbirken.fediscience.org.ap.brid.gy · 05/09/2026

Humble Bundle has a C J Cherryh book offer. She is one of my favourite authors, very prolific and quite underrated, even given that she won two Hugo awards along time ago. Now, her style is not everybodys. She uses stream of conciousness of the main character and so it is very dialogue heavy […]

fediscience.org

Original post on fediscience.org

Reposted by Philipp Birken

Ingmar Rentzhog @ingmar.wsocial.eu · 24/08/2026

The climate majority already exists. The challenge is making it visible. 50,000+ people marched in Stockholm five times more than expected. Scouts, unions, choirs, parents and more. I wrote about why this in @ahallbarhet.bsky.social and how Europe can scale it.

aktuellhallbarhet.se

Ingmar Rentzhog: Receptet från Stockholm – så blir majoriteten synlig för sig själv

Söndagens stora klimatdemonstration i Stockholm samlade ungefär 50 000 människor som höjde sina röster för en starkare klimatpolitik. Ingmar Rentzhog, We don’t have time, delar sina reflektioner från ...

Reposted by Philipp Birken

Philipp Birken @philippbirken.fediscience.org.ap.brid.gy · 24/08/2026

Why travel two days each way to Scotland instead of going by plain? It’s even more expensive, since you have to pay for the hotel on the way! Well, the climate, duh. But it’s worth taking a closer look. When going over land to Scotland from Sweden, you have to take a long detour (4000km), while […]

fediscience.org

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Reposted by Philipp Birken

Ingmar Rentzhog @ingmar.wsocial.eu · 23/08/2026

The first job of the climate movement is no longer to create a majority for stronger climate action. That majority already exists. The job now is to introduce the majority to itself. That started in Stockholm on 23 August 2026. Now it spreads across Europe. #DenStoraKlimatDemonstrationen

Reposted by Philipp Birken

Prof. Sam Lawler @sundogplanets.mastodon.social.ap.brid.gy · 19/08/2026

Wow. "AI adoption raises homework scores by 18% and reduces completion time by 30%, but lowers monthly exam scores by 20% within six months. High-stakes entrance-exam scores fall by 18 and 24%, with the full penalty emerging only after about two years. " […]

mastodon.social

Original post on mastodon.social

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Jonas Gustafsson @jonasgus.bsky.social · 09/08/2026

#EttSkräpOmDagen även på bergsbyfestivalen. #CleanSomethingForNothing

Reposted by Philipp Birken

Strömberg @cs1891.bsky.social · 09/08/2026

Män är ett allvarligt samhällsproblem.

Graf i DN över skillnaden mellan kvinnors (överväldigande oppositionen) och mäns (övervägande regeringsunderlaget) partisympatier.

Reposted by Philipp Birken

Philipp Birken @philippbirken.fediscience.org.ap.brid.gy · 07/08/2026

I thought I'd write down some reflections on long distance train travel: 1) Trains are not reliable, not in sweden, denmark, germany or the UK. 2) Since trains are not reliable, I strongly advise to use an interrail ticket. Without it, any delay causes stress, and that ruins the whole thing. 3) […]

fediscience.org

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Philipp Birken @philippbirken.fediscience.org.ap.brid.gy · 07/08/2026

A well written obituary for the founder of MathWorks. I didn't know that the term "embarassingly parallel" originated with him. I've met him a few times and he was a very kind man. www.siam.org/publications/siam-news…

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Reposted by Philipp Birken

Søren Have @sorenhave.dk · 01/08/2026

In July 97% of all new cars sold to private consumers in Denmark were EVs. Not HEVs or PHEVs. Pure BEVs. This means that private consumers only bought around 435 new cars with an exhaust pipe. www.dr.dk/nyheder/sene... #dktrp #dkgreen

Rekordmange købte en elbil i juli | Nyheder | DR

Når danskerne køber ny bil, vælger flere og flere at anskaffe sig en, der kører på el.

Philipp Birken @philippbirken.fediscience.org.ap.brid.gy · 25/07/2026

Reading "Enshittification" of @pluralistic . Can recommend, entertaining to read with good length and, of course, very interesting and pertinent. He makes the point that antitrust policies are an important tool to combat Enshittification and that a lot is going on in that direction, for example […]

fediscience.org

Original post on fediscience.org

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Philipp Birken @philippbirken.fediscience.org.ap.brid.gy · 24/07/2026

And I first read Yoko Uno, but Bruxelles is a town with style, so it's Yoko Tsuno street.

Two street signs, one in blue that reads "Valerie de la Reine' and below a white one that reads "Rue Yoko Tsuno", with an image of Yoko Tsuno"

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Philipp Birken @philippbirken.fediscience.org.ap.brid.gy · 23/07/2026

Ah, back in the EU where you do not need power adapters, people drive on the right side AND FAUCETS ARE NOT MADE BY UTTER MORONS!

Reposted by Philipp Birken

Kris @isotopp.infosec.exchange.ap.brid.gy · 22/07/2026

www.cs.utexas.edu/~fussell/courses/… # Compute - Angebot 1965, einige Jahre vor meiner Geburt, schrieb Gordon E. More then Artikel "Crammming more components into integrated circuits". Dort schrieb er das erste Mal über die […] [Original post on infosec.exchange]

Reposted by Philipp Birken

Kris @isotopp.infosec.exchange.ap.brid.gy · 21/07/2026

www.golem.de/news/world-ai-conferen… > Moonshot wird das Modell am 27. Juli als Open-Weights-Modell und damit weltweit auch lokal auf eigener Hardware nutzbar machen. Die leistungsmäßig vergleichbaren […]

infosec.exchange

Original post on infosec.exchange

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Philipp Birken @philippbirken.fediscience.org.ap.brid.gy · 17/07/2026

There are three species of birds in this image. Two with chicks. What are they and which have chicks? Answer in any language. This is at Rubha Hunish at the northern tip of the Isle of Skye. #birding

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Philipp Birken @philippbirken.fediscience.org.ap.brid.gy · 17/07/2026

There are three species of birds in this image. Two with chicks. What are they and which have chicks? Answer in any language. This is at Rubha Hunish at the northern tip of the Isle of Skye. #birding

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Philipp Birken @philippbirken.fediscience.org.ap.brid.gy · 17/07/2026

DHL sailing over the atlantic: 600 EU pallets, 15 days transit time, almost zero Emissions, planned from 2027. DHL is putting cargo on wind-powered ships across the Atlantic | Electrek electrek.co/2026/06/23/dhl-vela-car…

DHL is putting cargo on wind-powered ships across the Atlantic

DHL is turning to VELA for wind power to help move cargo across the Atlantic.

Reposted by Philipp Birken

Kris @isotopp.infosec.exchange.ap.brid.gy · 14/07/2026

KI ist eine nützliche Technologie, die Geld einbringen kann. Aber nicht einmal Näherungsweise so nützlich und Geld einbringend, wie die Investments erfordern, die da gegenwärtig gemacht werden. KI ist auch eine Technologie, die in den Kinderschuhe steckt und die bei Training und Inferenz noch […]

infosec.exchange

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Kris @isotopp.infosec.exchange.ap.brid.gy · 13/07/2026

RE: infosec.exchange/@masek/11691331195… Unerwartet stellt sich raus, Energiewende, Nachhaltigkeit und Umbau der Wirtschaft wären billiger gewesen als Technologie-Offenheit, und das mit dem Klimawandel ist gar keine grüne Propagandalüge!

infosec.exchange

Reposted by Philipp Birken

petersuber @petersuber.fediscience.org.ap.brid.gy · 07/07/2026

A new study finds that by 2023, APC-based #OpenAccess articles had surpassed paywalled subscription articles in the number of #retractions. insights.uksg.org/articles/10.1629/… The study does not blame OA as such. It blames the APC business model. "These findings raise concerns […]

fediscience.org

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Philipp Birken @philippbirken.fediscience.org.ap.brid.gy · 02/07/2026

Congratulations to the Fenics team on being awarded the Lanczos prize!!! #fenics euromathsoc.org/news/developers-of-…

Reposted by Philipp Birken

Philipp Birken @philippbirken.fediscience.org.ap.brid.gy · 27/06/2026

It's time for the summer long distance train travel thread! This year, first conference in Edinburgh, then great Glen way, then Isle of Skye, then a slowlish way back via London, Bryssels, Hamburg. Today, the goal is to get from Malmö to Cologne via Copenhagen and Hamburg. We'll see what the […]

fediscience.org

Original post on fediscience.org

Philipp Birken @philippbirken.fediscience.org.ap.brid.gy · 27/06/2026

It's time for the summer long distance train travel thread! This year, first conference in Edinburgh, then great Glen way, then Isle of Skye, then a slowlish way back via London, Bryssels, Hamburg. Today, the goal is to get from Malmö to Cologne via Copenhagen and Hamburg. We'll see what the […]

fediscience.org

Original post on fediscience.org

Reposted by Philipp Birken

Thomas Kahle @tomkalei.mathe.social.ap.brid.gy · 26/06/2026

RE: mathe.social/@tomkalei/116812600219… Wie ihr vielleicht gesehen habt, ging gestern die neue #Mastodon Instanz => mathe.social <= :blobcatmaths: an den Start. Wenn ihr Leute aus der (deutschsprachigen) #Mathematik kennt, die jetzt starten wollen... Bei der Registration bitte […]

machteburch.social

Original post on machteburch.social

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Philipp Birken @philippbirken.fediscience.org.ap.brid.gy · 13/06/2026

Antony Jameson died yesterday at age 91 and I am sad. I visited him at Texas A&M last february, and I think both him and me did not expect to meet again. Any aircraft you’ve ever flown in was designed using simulation methods he developed. This includes […] [Original post on fediscience.org]

A grey haired man with a green pullover sitting in a chair in an office full of books and stacks of papers. There's a toy airplane on the desk behin him. He is smiling warmly.

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Philipp Birken @philippbirken.fediscience.org.ap.brid.gy · 13/06/2026

Antony Jameson died yesterday at age 91 and I am sad. I visited him at Texas A&M last february, and I think both him and me did not expect to meet again. Any aircraft you’ve ever flown in was designed using simulation methods he developed. This includes […] [Original post on fediscience.org]

A grey haired man with a green pullover sitting in a chair in an office full of books and stacks of papers. There's a toy airplane on the desk behin him. He is smiling warmly.

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Philipp Birken @philippbirken.fediscience.org.ap.brid.gy · 03/05/2026

Bane, Cain, Black. The Orlando Magic are the Diablo II team.

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Reposted by Philipp Birken

Philipp Birken @philippbirken.fediscience.org.ap.brid.gy · 14/04/2026

The faculty of science at Lund University is hiring two assistant professors in computational science. You can select which institution such as biology, maths or physics you want to be employed at. Computational science is broadly defined as research that applies and develops methods for […]

fediscience.org

Original post on fediscience.org

Philipp Birken @philippbirken.fediscience.org.ap.brid.gy · 14/04/2026

The faculty of science at Lund University is hiring two assistant professors in computational science. You can select which institution such as biology, maths or physics you want to be employed at. Computational science is broadly defined as research that applies and develops methods for […]

fediscience.org

Original post on fediscience.org