@e_d_andersen

I am slowly closing down this profile. Follow me on @primaldual.bsky.app.

 Copenhagen
erling.andersens.name
Joined December 2009
  • Tweets7.5K
  • Following590
  • Followers1.5K
117Media
Important piece.
Business Ukraine mag
@Biz_Ukraine_Mag29 Aug 2025
As long as Kyiv continues to control the Donbas fortress belt in eastern Ukraine, there is a good chance the Ukrainian military can turn the surrounding region into a graveyard for Putin’s invading army, writes @MBielieskov atlanticcouncil.org/blogs/uk…

Putin wants to capture Ukraine's crucial fortress belt without a fight

As US-led efforts to end the Russian invasion of Ukraine struggle to gain momentum, Vladimir Putin’s latest territorial demands include the surrender of strategically vital and heavily fortified...

atlanticcouncil.org
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Here in Denmark the mood towards the mood is also changing rapidly. Highly pro US persons are asking themselves if we should continue to buy our weapons in the US. An irrelevant question a few weeks ago.
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Loris Cro ⚡
@croloris2 Nov 2024
Lessons learned from a successful Rust rewrite. gaultier.github.io/blog/less…
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I see more and more OR people on Bluesky. Follow me at bsky.app/profile/primaldual.…
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A good day for Putin.
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Maybe not following the news today and getting the final result tonight is the least painful path to the result.
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Erling Andersen retweeted
Ben Wikler@benwikler5 Nov 2024
Before Walz took the stage in Milwaukee tonight, I got a call from a number unlike any I'd ever seen. It ended with four zeroes. I picked it up. It was Joe Biden. 🧵
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Please more good news this week.
Republicans against Trump
@RpsAgainstTrump3 Nov 2024
BREAKING Moldova President Maia Sandu has defeated her pro-Russia rival and won reelection. This is great news for Europe and terrible news for Putin.
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Jakob Skyggebjerg@JakobSkygge1 Nov 2024
Så ramte sektordimensionering også de naturvidenskabelige ba.uddannelser på Københavns Universitet. På trods af lav arbejdsløshed og gode lønninger skal vi uddanne færre fysikere, dataloger og forsikringsmatematikere fra næste år. Klasse uddannelsespoltik, hva #dkpol #uddpol
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Can't express how much I'm not enjoying living in Schrödinger's democracy where we'll open the box on Tuesday and find out if it's dead or not
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Gabriel Peyré
@gabrielpeyre28 Oct 2024
Moreau's decomposition generalizes orthogonal decomposition from linear spaces to convex cones. convexoptimization.com/wikim… en.wikipedia.org/wiki/Convex…
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Don Van Natta Jr.
@DVNJr27 Oct 2024
The greatest New Yorker cartoon of all time.
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Carl Bernstein@carlbernstein26 Oct 2024
Statement on Washington Post’s refusal to endorse presidential candidate.
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Når min virksomhed bliver pålagt krav for eks. ny regnskabslov, så får jeg da ikke erstatning. Ikke at jeg forstår argumentet, men ... »Nu ødelægger vi lige din bil. Så kan du få erstatning for det, den er værd, når den er ødelagt« jyllands-posten.dk/indland/E…

Oprørt landmand: »Nu ødelægger vi lige din bil. Så kan du få erstatning for det, den er værd, når...

Regeringen afviser at dække de milliardtab, landmændene lider, når store landbrugsarealer skal omlægges til skov og natur som følge af trepartsaftalen. Men den går ikke, lyder modsvaret.

jyllands-posten.dk
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Erling Andersen retweeted
Ben Dicken
@BenjDicken18 Oct 2024
You asked for it, so here it is. Visualizing CPU cache speeds relative to RAM. Cache optimization is important too!
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So did Trump have his Biden moment.
Fred Wellman
@FPWellman15 Oct 2024
Look that wasn’t just the usual “weird.” He couldn’t coherently answer the 4 questions he took then just transitioned to swaying to music for over 20 minutes. Just stood there. Half way says let’s take questions then changes his mind and calls for more music. He is fried.
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Just learned that one of the motivations for APL was to make it easy to implement the simplex algorithm.
Philip Zucker@SandMouth10 Oct 2024
okmij.org/ftp/Computation/AR… Oleg commentary on APL. Chef’s kiss.
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Deserved.
SIAM@TheSIAMNews2 Oct 2024
Congratulations to SIAM member Shuzhong Zhang of @UMNISyE, named a 2024 @INFORMS Fellow for his contributions to continuous optimization in areas such as operations research & bioinformatics. 👏 View the full list of 2024 INFORMS fellows: informs.org/News-Room/INFORM…
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Network Fact@NetworkFact2 Oct 2024
Giant components and the Lambert W function johndcook.com/blog/2013/08/1…

Giant components and the Lambert W-function

The Lambert W-function is the function w(z) implicitly defined by w exp(w) = z. When I first saw this, I thought that I'd seen something like this come up many times and that it would be really handy...

johndcook.com
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Important transformation when conic optimization is employed. If you apply it to ||x|| ≤1 you get a quadratic cone.
Gabriel Peyré
@gabrielpeyre2 Oct 2024
The perspective transform turns a 1D convex function into a 2D positively homogeneous convex function. Fundamental in convex analysis. At the heart of Cizsar divergences. math.univ-toulouse.fr/Archiv…
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