Ulrich Pennig
@pennigulrich.bsky.social
Senior Lecturer in Algebra and Topology at Cardiff University. All views are my own.
Happy (topological) Valentines Day!
February 14, 2026 at 4:14 PM
Happy (topological) Valentines Day!
Reposted by Ulrich Pennig
Well done Bangor University Debating Society
February 10, 2026 at 7:45 AM
Well done Bangor University Debating Society
This sounds like a good summary: www.youtube.com/watch?app=de...
Why Replacing Developers with AI is Going Horribly Wrong
YouTube video by Mackard
www.youtube.com
February 8, 2026 at 9:47 AM
This sounds like a good summary: www.youtube.com/watch?app=de...
Another website that future historians will find helpful (as we do not seem to be able to learn at our current stage): incidentdatabase.ai
Welcome to the Artificial Intelligence Incident Database
The starting point for information about the AI Incident Database
incidentdatabase.ai
February 6, 2026 at 10:54 AM
Another website that future historians will find helpful (as we do not seem to be able to learn at our current stage): incidentdatabase.ai
Reposted by Ulrich Pennig
Have some (applied) topology research you want to share with the world? Consider adding it to 🍩DONUT🍩, our Database of Original & Non-Theoretical Uses of Topology.
Great intro by Barbara Giunti: www.youtube.com/watch?v=eQ_5...
🏠 donut.topology.rocks
Great intro by Barbara Giunti: www.youtube.com/watch?v=eQ_5...
🏠 donut.topology.rocks
Barbara Giunti: DONUT - Database of Original Non-theoretical Uses of Topology
YouTube video by Applied Algebraic Topology Network
www.youtube.com
January 30, 2026 at 8:52 AM
Have some (applied) topology research you want to share with the world? Consider adding it to 🍩DONUT🍩, our Database of Original & Non-Theoretical Uses of Topology.
Great intro by Barbara Giunti: www.youtube.com/watch?v=eQ_5...
🏠 donut.topology.rocks
Great intro by Barbara Giunti: www.youtube.com/watch?v=eQ_5...
🏠 donut.topology.rocks
Reposted by Ulrich Pennig
It's only 3 weeks since the US invaded Venezuela, captured its president and appropriated its oil.
And yet it's barely been in the news for last week or two cos of all the other new shit.
What a world.
makes it hard for me & @sandylaping.bsky.social to stay on top of www.trumpactiontracker.info!
And yet it's barely been in the news for last week or two cos of all the other new shit.
What a world.
makes it hard for me & @sandylaping.bsky.social to stay on top of www.trumpactiontracker.info!
www.trumpactiontracker.info
January 24, 2026 at 11:52 AM
It's only 3 weeks since the US invaded Venezuela, captured its president and appropriated its oil.
And yet it's barely been in the news for last week or two cos of all the other new shit.
What a world.
makes it hard for me & @sandylaping.bsky.social to stay on top of www.trumpactiontracker.info!
And yet it's barely been in the news for last week or two cos of all the other new shit.
What a world.
makes it hard for me & @sandylaping.bsky.social to stay on top of www.trumpactiontracker.info!
Reposted by Ulrich Pennig
Reposted by Ulrich Pennig
Gedenkstätten, Lernorte, Museen und Archive haben einen offenen Brief veröffentlicht: „𝗞𝗼𝗻𝘀𝗲𝗾𝘂𝗲𝗻𝘁𝗲𝘀 𝗩𝗼𝗿𝗴𝗲𝗵𝗲𝗻 𝗴𝗲𝗴𝗲𝗻 𝗞𝗜-𝗴𝗲𝗻𝗲𝗿𝗶𝗲𝗿𝘁𝗲 𝗛𝗼𝗹𝗼𝗰𝗮𝘂𝘀𝘁-𝗩𝗲𝗿𝗳ä𝗹𝘀𝗰𝗵𝘂𝗻𝗴𝗲𝗻 𝗮𝘂𝗳 𝗦𝗼𝗰𝗶𝗮𝗹 𝗠𝗲𝗱𝗶𝗮-𝗣𝗹𝗮𝘁𝘁𝗳𝗼𝗿𝗺𝗲𝗻“. Hier geht es zum ganzen Text: www.gedenkstaetten-hamburg.de/de/aktuelles...
January 13, 2026 at 1:15 PM
Gedenkstätten, Lernorte, Museen und Archive haben einen offenen Brief veröffentlicht: „𝗞𝗼𝗻𝘀𝗲𝗾𝘂𝗲𝗻𝘁𝗲𝘀 𝗩𝗼𝗿𝗴𝗲𝗵𝗲𝗻 𝗴𝗲𝗴𝗲𝗻 𝗞𝗜-𝗴𝗲𝗻𝗲𝗿𝗶𝗲𝗿𝘁𝗲 𝗛𝗼𝗹𝗼𝗰𝗮𝘂𝘀𝘁-𝗩𝗲𝗿𝗳ä𝗹𝘀𝗰𝗵𝘂𝗻𝗴𝗲𝗻 𝗮𝘂𝗳 𝗦𝗼𝗰𝗶𝗮𝗹 𝗠𝗲𝗱𝗶𝗮-𝗣𝗹𝗮𝘁𝘁𝗳𝗼𝗿𝗺𝗲𝗻“. Hier geht es zum ganzen Text: www.gedenkstaetten-hamburg.de/de/aktuelles...
Do you love operator algebras? Join us in the Abacws Building at Cardiff University for the next meeting of our research network Operator Algebras in the South of the UK in Cardiff from 19th to 20th March 2026. Details can be found on our homepage
sites.google.com/view/operato... #Maths #Research
sites.google.com/view/operato... #Maths #Research
January 12, 2026 at 10:33 AM
Do you love operator algebras? Join us in the Abacws Building at Cardiff University for the next meeting of our research network Operator Algebras in the South of the UK in Cardiff from 19th to 20th March 2026. Details can be found on our homepage
sites.google.com/view/operato... #Maths #Research
sites.google.com/view/operato... #Maths #Research
Reposted by Ulrich Pennig
Would you like 30 mins that has nothing to do with any of the big important things happening out there? Here is a performance and interview for Vermont’s wonderful show Across the Fence. It aired on Christmas Day but I was mostly offline and forgot to post about it.
12/25/25 Music for the Holidays with cellist and composer Zoe Keating
YouTube video by Across the Fence
www.youtube.com
January 10, 2026 at 10:13 PM
Would you like 30 mins that has nothing to do with any of the big important things happening out there? Here is a performance and interview for Vermont’s wonderful show Across the Fence. It aired on Christmas Day but I was mostly offline and forgot to post about it.
I have been following @israellai.bsky.social 's journey to Learning Welsh. Now he wants to do the British Citizenship Test in Welsh, which seems to be quite difficult: www.youtube.com/watch?v=JYFu...
#Welsh #Wales #LearningWelsh
#Welsh #Wales #LearningWelsh
About the Welsh Citizenship Test Situation...
YouTube video by Rhapsody in Lingo
www.youtube.com
December 31, 2025 at 4:43 PM
I have been following @israellai.bsky.social 's journey to Learning Welsh. Now he wants to do the British Citizenship Test in Welsh, which seems to be quite difficult: www.youtube.com/watch?v=JYFu...
#Welsh #Wales #LearningWelsh
#Welsh #Wales #LearningWelsh
Reposted by Ulrich Pennig
Cardiff University students are demanding that the university authorities answer a series of searching questions following a traumatic year in which more than 1,800 academics were originally put ‘in scope’ for redundancy ✍️Martin Shipton
Students call on Cardiff University to 'open the books' as cuts concerns continue
Martin Shipton Cardiff University students are demanding that the university authorities answer a series of searching questions following a traumatic year in which more than 1,800 academics were origi...
wp.me
December 30, 2025 at 7:46 PM
Cardiff University students are demanding that the university authorities answer a series of searching questions following a traumatic year in which more than 1,800 academics were originally put ‘in scope’ for redundancy ✍️Martin Shipton
Oh. My. God. I reached room 46...
December 22, 2025 at 8:38 PM
Oh. My. God. I reached room 46...
Waseda University in Tokyo is bidding to become the location for the ICM in 2030. www.youtube.com/watch?v=FeRg...
Bid for ICM2030 in Japan
YouTube video by icm2030bid
www.youtube.com
December 22, 2025 at 4:36 PM
Waseda University in Tokyo is bidding to become the location for the ICM in 2030. www.youtube.com/watch?v=FeRg...
I am happy to share that our article "Spectral sequence computation of higher twisted K-groups of SU(n)" has now been published in Communications of the American Mathematical Society. 🎉
doi.org/10.1090/cams...
#Mathematics #KTheory #OperatorAlgebras #Research
doi.org/10.1090/cams...
#Mathematics #KTheory #OperatorAlgebras #Research
AMS :: Communications of the American Mathematical Society
doi.org
December 22, 2025 at 10:43 AM
I am happy to share that our article "Spectral sequence computation of higher twisted K-groups of SU(n)" has now been published in Communications of the American Mathematical Society. 🎉
doi.org/10.1090/cams...
#Mathematics #KTheory #OperatorAlgebras #Research
doi.org/10.1090/cams...
#Mathematics #KTheory #OperatorAlgebras #Research
Reposted by Ulrich Pennig
I will be pushing for a moratorium on the construction of data centers that are powering the unregulated sprint to develop & deploy AI.
The moratorium will give democracy a chance to catch up, and ensure that the benefits of technology work for all of us, not just the 1%.
The moratorium will give democracy a chance to catch up, and ensure that the benefits of technology work for all of us, not just the 1%.
It's Time for a Moratorium on Data Centers | Sen. Bernie Sanders
YouTube video by Senator Bernie Sanders
youtu.be
December 17, 2025 at 1:26 PM
I will be pushing for a moratorium on the construction of data centers that are powering the unregulated sprint to develop & deploy AI.
The moratorium will give democracy a chance to catch up, and ensure that the benefits of technology work for all of us, not just the 1%.
The moratorium will give democracy a chance to catch up, and ensure that the benefits of technology work for all of us, not just the 1%.
This is an excellent article. A lot of it reads painfully familiar. www.currentaffairs.org/news/ai-is-d...
AI is Destroying the University and Learning Itself
Students use AI to write papers, professors use AI to grade them, degrees become meaningless, and tech companies make fortunes. Welcome to the death of higher education.
www.currentaffairs.org
December 7, 2025 at 6:14 PM
This is an excellent article. A lot of it reads painfully familiar. www.currentaffairs.org/news/ai-is-d...
Reposted by Ulrich Pennig
We have written a special report looking at the people behind Reform in Wales.
This was a bizarre piece to write.
willhaywardwales.substack.com/p/special-re...
This was a bizarre piece to write.
willhaywardwales.substack.com/p/special-re...
Special report: Who are Reform in Wales?
We dived into the wild world of Reform UK in Cymru
willhaywardwales.substack.com
November 30, 2025 at 9:13 AM
We have written a special report looking at the people behind Reform in Wales.
This was a bizarre piece to write.
willhaywardwales.substack.com/p/special-re...
This was a bizarre piece to write.
willhaywardwales.substack.com/p/special-re...
People Make Games reporting (in their usual excellent way) about the situation at Rockstar Games:
www.youtube.com/watch?v=c9nO...
and the follow-up
www.youtube.com/watch?v=8TvW...
www.youtube.com/watch?v=c9nO...
and the follow-up
www.youtube.com/watch?v=8TvW...
The Rockstar Workers Fired Before They Could Finish GTA 6
YouTube video by People Make Games
www.youtube.com
November 24, 2025 at 9:13 PM
People Make Games reporting (in their usual excellent way) about the situation at Rockstar Games:
www.youtube.com/watch?v=c9nO...
and the follow-up
www.youtube.com/watch?v=8TvW...
www.youtube.com/watch?v=c9nO...
and the follow-up
www.youtube.com/watch?v=8TvW...
Excited to share details about this upcoming one-day workshop bringing together leading researchers in operator algebras and related fields!
- on Friday, 21st November 2025
- in the Fry Building, School of Mathematics, University of Bristol
For details see: sites.google.com/view/operato...
- on Friday, 21st November 2025
- in the Fry Building, School of Mathematics, University of Bristol
For details see: sites.google.com/view/operato...
LinkedIn
This link will take you to a page that’s not on LinkedIn
lnkd.in
November 11, 2025 at 8:04 PM
Excited to share details about this upcoming one-day workshop bringing together leading researchers in operator algebras and related fields!
- on Friday, 21st November 2025
- in the Fry Building, School of Mathematics, University of Bristol
For details see: sites.google.com/view/operato...
- on Friday, 21st November 2025
- in the Fry Building, School of Mathematics, University of Bristol
For details see: sites.google.com/view/operato...
Reposted by Ulrich Pennig
In case anyone wants to make some of these boards, I put the laser-cutter templates on my blog. divisbyzero.com/2025/11/01/a...
November 1, 2025 at 6:10 PM
In case anyone wants to make some of these boards, I put the laser-cutter templates on my blog. divisbyzero.com/2025/11/01/a...
Reposted by Ulrich Pennig
Full length video here, 9:01 minutes long - amazing work @ledbydonkeys.org.
Trump & Epstein on Windsor castle #fyp
TikTok video by Led By Donkeys
www.tiktok.com
September 17, 2025 at 8:25 AM
Full length video here, 9:01 minutes long - amazing work @ledbydonkeys.org.
'Meta CEO Mark Zuckerberg has told analysts that people without smart glasses may one day be at a "significant cognitive disadvantage" compared to those who do use the tech'
September 16, 2025 at 9:23 AM
'Meta CEO Mark Zuckerberg has told analysts that people without smart glasses may one day be at a "significant cognitive disadvantage" compared to those who do use the tech'
Today was the final day of the 38th British Topology Meeting. It was fun! Great to see so many young people in the field and hear all the recent developments.
September 11, 2025 at 8:00 PM
Today was the final day of the 38th British Topology Meeting. It was fun! Great to see so many young people in the field and hear all the recent developments.
Ladies and Gentlemen! Elle Cordova: www.youtube.com/shorts/AYm9w...
For our scientists
YouTube video by Elle Cordova
www.youtube.com
September 9, 2025 at 10:09 PM
Ladies and Gentlemen! Elle Cordova: www.youtube.com/shorts/AYm9w...