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@sofdem

Math optimization for environment and climate sofdem.github.io

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24.10.2024
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Latest posts by @sofdem

📚 New Arxiv Paper

Title: Localization of complementarity eigenvalues
Authors: Antonio Sasaki (CMA, PSL), Sophie Demassey (CMA, PSL), Valentina Sessa (CMA, PSL)

Read more: https://arxiv.org/abs/2601.15789

23.01.2026 08:02 👍 1 🔁 1 💬 0 📌 0
Springer advertisement for the "Branch-and-Price" book

Springer advertisement for the "Branch-and-Price" book

our #openaccess book on "branch-and-price" is finally published; you can download it here link.springer.com/book/10.1007...

#orms @springernature.com

10.02.2026 20:27 👍 30 🔁 6 💬 4 📌 1

Derrière notre rapport à la hiérarchie, c'est tout un système bureaucratique qui est en jeu.

C’est une logique qui fait qu'on regarde "vers en haut", vers l'approbation de nos chef.fe.s, plutôt qu'en face de nous, là où se trouvent les citoyennes et citoyens.
4/10

28.01.2026 17:02 👍 4 🔁 1 💬 1 📌 0
Median time under review (time intervened from submission to acceptance) of articles indexed in PubMed with a female first author (n = 2,562,262), a male first author (n = 3,405,821), a female corresponding author (n = 975,010), a male corresponding author (n = 1,946,469), a female first author and a female corresponding author (n = 757,878), a male first author and a male corresponding author (n = 1,357,835), all-female authors (n = 650,280), and all-male authors (n = 2,146,799)

Median time under review (time intervened from submission to acceptance) of articles indexed in PubMed with a female first author (n = 2,562,262), a male first author (n = 3,405,821), a female corresponding author (n = 975,010), a male corresponding author (n = 1,946,469), a female first author and a female corresponding author (n = 757,878), a male first author and a male corresponding author (n = 1,357,835), all-female authors (n = 650,280), and all-male authors (n = 2,146,799)

Female scientists have to wait longer for their articles to be reviewed than their male colleagues. An analysis of 36.5 million papers in the life sciences shows that for females it took 115 days to reach a decision, compared to 101 days for men journals.plos.org/plosbiology/... @plosbiology.org

22.01.2026 08:43 👍 139 🔁 75 💬 5 📌 9
Preview
C'était Paris en 1970 Photographies numérisées du fonds C'était Paris en 1970

Je viens de tomber sur un truc fascinant. En 1970, la FNAC et Paris ont organisé un concours photo basé sur un découpage géométrique de Paris. Ce site permet de visionner 30 000 des photos produites à cette occasion

paris1970.jeantho.eu/index.html

18.01.2026 21:06 👍 1038 🔁 465 💬 52 📌 57

This one by @ferracimo.bsky.social ...

"If you're a researcher & want to have real-world impact, this is essential reading"- @charliejgardner.bsky.social

"A vital read for academic relevance in our century of climate, ecological & political crises'- @jksteinberger.bsky.social

17.01.2026 06:08 👍 42 🔁 19 💬 2 📌 1

I'll say again: The easiest way to radicalise someone is to ask them their favourite hobby and demonstrate how capitalism has fucked it up.

12.01.2026 10:39 👍 72 🔁 22 💬 1 📌 0

**Please repost** If you're enjoying Paper Skygest -- our personalized feed of academic content on Bluesky -- we'd appreciate you reposting this! We’ve found that the most effective way for us to reach new users and communities is through users sharing it with their network

19.08.2025 17:15 👍 48 🔁 47 💬 1 📌 6
Brian Eno's Oblique Strategies

Tiens, les "Oblique Strategies" de Brian Eno sont disponibles sous forme de site web : ob-strat.netlify.app

C'est bien amusant à utiliser pour écrire, je suppose que ça le sera encore plus pour la team zicos (cc @artuandelierree.com @zus.bsky.social)

Wiki : en.wikipedia.org/wiki/Oblique...

09.01.2026 16:27 👍 13 🔁 5 💬 2 📌 0
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I recall @philipcball.bsky.social wrote a book about this...

30.11.2025 12:20 👍 18 🔁 4 💬 0 📌 0

Et merci de ne pas reporter plus encore la charge (rapporteuses et jurys) sur les rangs B à défaut de femmes rang A :)

28.11.2025 09:30 👍 0 🔁 0 💬 1 📌 0

Yes you’re totally right, just they sound a bit too anthropomorphic to me

19.11.2025 22:57 👍 0 🔁 0 💬 1 📌 0

+1 (for column generation) for Benders I use the bilevel terms: upper/lower level

19.11.2025 17:55 👍 3 🔁 0 💬 1 📌 0

Parce qu’une partie des Mines PSL est implantée à Sophia depuis plus de 50 ans.

31.10.2025 06:39 👍 0 🔁 0 💬 1 📌 0

mais ces formations (sérieuses) là ne sont pas trop touchées car toutes les entreprises ne sont pas prêtes à renoncer à ces compétences. La situation des sciences humaines et fondamentales est plus préoccupante, et ce n’est pas le problème de chatgpt. Je crois.

17.10.2025 09:02 👍 0 🔁 0 💬 0 📌 0

Non c’est juste faux: ni le contributeur de l’article ni ChatGPT ne sauraient expliquer aujourd’hui la “supply chain optimization” ni même plagier correctement un livre sur le sujet

17.10.2025 08:39 👍 0 🔁 0 💬 1 📌 0
The first author of that paper was his own supervisor, Ailsa Land, who was still at the London School of Economics. But he did not know what had become of the second author. “All I know is that she was Australian and that she shares your name,” Gilbert said to me.

Many years later, I started teaching optimisation (and her own branch-and-bound method) at the University of Melbourne. I always mentioned the mystery of this Australian woman who was my namesake and who had disappeared after publishing such an influential paper.

After one of these classes, a student approached me and said, “Professor, there’s a tutor here named Alison. Maybe it’s her.”

With little hope, I looked into it, and to my surprise, the tutor was indeed Alison Doig, now Alison Harcourt. My desire was to run, knock on each one of my colleagues’ doors and ask: “Do you know who that woman is?”.

The first author of that paper was his own supervisor, Ailsa Land, who was still at the London School of Economics. But he did not know what had become of the second author. “All I know is that she was Australian and that she shares your name,” Gilbert said to me. Many years later, I started teaching optimisation (and her own branch-and-bound method) at the University of Melbourne. I always mentioned the mystery of this Australian woman who was my namesake and who had disappeared after publishing such an influential paper. After one of these classes, a student approached me and said, “Professor, there’s a tutor here named Alison. Maybe it’s her.” With little hope, I looked into it, and to my surprise, the tutor was indeed Alison Doig, now Alison Harcourt. My desire was to run, knock on each one of my colleagues’ doors and ask: “Do you know who that woman is?”.

This story of the discovery of Alison Doig the person is wild

pursuit.unimelb.edu.au/articles/cel...

27.07.2025 14:07 👍 17 🔁 5 💬 1 📌 1
Preview
Fanny Gollier-Briant : « Il faut absolument repolitiser la souffrance des jeunes » La pédopsychiatre au CHU de Nantes considère le « plan psychiatrie » présenté en juin par le gouvernement largement insuffisant, alors que les chiffres sur la santé mentale des adolescents et des jeun...

Les abonnés de @politis.fr ont libéré le formidable entretien réalisé par @elsagambin.bsky.social avec la pédopsychiatre Fanny Gollier-Briant sur la santé mentale des adolescents et des jeunes adultes . A lire absolument, ici ⤵️ www.politis.fr/articles/202...

24.07.2025 08:47 👍 169 🔁 126 💬 6 📌 8

Marouane is live tweeting all #EuroMIP25 talks, follow him to stay up to date

01.07.2025 13:34 👍 8 🔁 4 💬 1 📌 0
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Sophie Demassey @sofdem.bsky.social kicks off the third and final day of #EuroMIP25 with a talk on Block Coordination of Nonlinear Network and Discrete Optimization. She focuses on scheduling nonlinear flow networks, with an application to load shifting in drinking water systems.

#EuroMIP25 #orms

03.07.2025 15:11 👍 5 🔁 2 💬 2 📌 0

Thank you Marouane for your amazing commitment to synthesize the talks and especially this one :) I would not have been able to summarize it with more precision! Thank you

03.07.2025 15:42 👍 2 🔁 0 💬 0 📌 0

Like I've said before, if you have any doubts about climate change, just go to a super-boring insurance conference and listen to the super-boring panels where they dryly talk about the growing threat of disasters so catastrophic and unpredictable in scope they simply cannot be insured at any price.

18.06.2025 21:44 👍 14331 🔁 5497 💬 261 📌 208

Thank you Thiago for your synthesis of the talks. Much appreciated!

07.06.2025 05:33 👍 2 🔁 0 💬 0 📌 0
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Trump banned important words from research - 350 of them.
So we said 🛑Touche pas à mon pote!✊ and stuffed as many of them as we could into the abstract of our new math paper. 🫵You can do the same!🫵Join the cause with your next abstract - they will have no choice but to hear us.
#AdoptCensoredWords

06.06.2025 10:04 👍 13 🔁 7 💬 1 📌 1
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Bill Cook strikes again: shortest tour of 81,998 bars in South Korea is the top story tonight at Hacker News

www.math.uwaterloo.ca/tsp/korea/in...

24.04.2025 04:32 👍 22 🔁 2 💬 0 📌 1
Preview
The Forgotten History of Hitler’s Establishment Enablers The Nazi leader didn’t seize power; he was given it.

Hitler’s rise to power shows how a country with a functional, if flawed, democratic machinery handed absolute power over to someone whom the conservative political class regarded as a chaotic clown with a violent following.

19.04.2025 23:58 👍 771 🔁 308 💬 39 📌 35
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Opinion | What Autocrats Want From Academics: Servility In 1931, Italian scholars were made to take loyalty oaths. Will that happen to us?

"On October 8, 1931, a law went into effect requiring every Italian university professor to sign an oath pledging their loyalty to the government of Benito Mussolini. Out of over 1,200 professors in the country, only 12 refused. All of them were immediately fired." www.chronicle.com/article/what...

21.03.2025 22:45 👍 13063 🔁 6224 💬 311 📌 421

More summer schools added to the list today!

thiagoserra.com/2025/02/04/s...

08.03.2025 00:22 👍 7 🔁 2 💬 0 📌 0

Still there exist well documented use cases for the second category, like lagrangian relaxation applied to electricity power production planning at short mid and long term

02.03.2025 22:07 👍 2 🔁 0 💬 0 📌 0
Screenshot from the IEEE front page, from Feb 16, 2025, showing images and links to eight different pages. The third spot is titled "Diversity, equity, and inclusion", with the text "Learn how IEEE and its members are working to grow diversity, equity, and inclusion in IEEE activities and in the technical profession".

Screenshot from the IEEE front page, from Feb 16, 2025, showing images and links to eight different pages. The third spot is titled "Diversity, equity, and inclusion", with the text "Learn how IEEE and its members are working to grow diversity, equity, and inclusion in IEEE activities and in the technical profession".

Screenshot of the same IEEE page from Feb 24, 2025. 7 of the 8 links are identical, but "Diversity, equity, and inclusion" has been replaced with "Member discounts".

Screenshot of the same IEEE page from Feb 24, 2025. 7 of the 8 links are identical, but "Diversity, equity, and inclusion" has been replaced with "Member discounts".

"We are sorry, the page you are looking for has been moved or removed."

"We are sorry, the page you are looking for has been moved or removed."

Hey #IEEE, can you explain where your "Diversity, Equity & Inclusion at IEEE" page went?!

Last week, it was still linked on the front page.

Now: It's gone, and the old link goes to "We are sorry, the page you are looking for has been moved or removed."

www.ieee.org/about/divers...

24.02.2025 11:27 👍 16 🔁 7 💬 3 📌 4