Dirk L.

Does and teaches applied mathematics. (he/him, er/ihn)

[Luke Heeney @heeney_luke]

We've lost an absolute giant today. RIP Dimitri Bertsekas. His probability and optimization books got me through my masters. Massive loss for the MIT community and the field.

[Dirk L. @Dirque_L]

Every optimization problem is linear if you lift enough

[Dirk L. @Dirque_L]

@npparikh I guess there is already a weird feedback happening where people make an effort to sound like not AI

[Dirk L. @Dirque_L]

I noticed that LLMs already affect student presentations a lot, but now at #SIAMOP26 I realize that also here, people use ChatGPT et al. to produce their slides (at least, that's the obvious explanation for all the "Why this matters" boxes I see on slides...)

[Dirk L. @Dirque_L]

That's a hell of a venue for a plenary talk here at #SIAMOP26

[Dirk L. @Dirque_L]

Agreed - but if you look for a field that teaches you to understand new things go for the real thing and just study math

[Paul Novosad @paulnovosad]

Good education has never been more important than it is now.

With AI, *what* you know matters less. Whether you can figure out and understand new stuff is totally essential.

Degrees like econ that teach you to think analytically about new problems are worth more than ever.

[Dirk L. @Dirque_L]

@econ_lessmann @replayNIKO Am besten mit deiner Unterschrift nochmal posten 😉.

Aber wieso ist das aus dem März?

[SIAM @TheSIAMNews]

We are deeply saddened to hear of the passing of Cleve Moler, co-founder of MathWorks and original author of MATLAB, on May 20, 2026.

A SIAM President and Fellow, Cleve was an icon and leader who helped shape generations and advance applied mathematics: https://t.co/kNWl7kvefQ

[cephalopodshop @macrocephalopod]

RIP to the GOAT. https://t.co/AbFrruZsOt

[Dirk L. @Dirque_L]

In the past some pretentious scientists used to say "I don't read papers, I write papers." and now I learn that today scientists don't even dare to read their own papers they didn't even write.

[Dirk L. @Dirque_L]

@bremen79 When you read preprints, you are effectively a reviewer

[Dirk L. @Dirque_L]

The job of "computer" has been replaced by the job of "programmer". The job of "mathematician" will be replaced by the job "..."?

[Dr Kareem Carr @kareem_carr]

This feels crazy to say, but much like "computer" used to a job done by humans, we might be witnessing the last generation of mathematicians

[Dirk L. @Dirque_L]

@wtgowers Every sign has a story behind it 😬

[Dirk L. @Dirque_L]

@majavonwestphal Wenn man es Referat nennen würde, würde das bei uns gehen (kann Ausarbeitung und Vortrag und Auseinandersetzung mit Inhalt umfassen).

[Dirk L. @Dirque_L]

That's basically von Neumann's convergence result for the method of alternating projections onto two subspaces. I wouldn't call this "folklore"...

[Sam Walters ☕️ @SamuelGWalters]

A kind of folklore theorem. If P is orthogonal projection onto a subspace M, and Q is orthogonal projection onto a subspace N, then the orthogonal projection R onto the intersection M ∩ N can be written as a simple limit of powers of PQ. #math #algebra

[Dirk L. @Dirque_L]

@mathandcobb @disregardfiat 11^758

[Dirk L. @Dirque_L]

Solange Master-Studis mir (und sich) gute Fragen stellen können, können sie etwas, was KI nicht kann (weil KI nichts will).

[Prof. Karl Lauterbach @Karl_Lauterbach]

Das wird jungen Akademikern noch massiv zu schaffen machen. KI wird weiter immer besser, kein Ende in Sicht. Innerhalb von 2 Jahren ist das Wissen auf das Niveau von Promovierten gestiegen. Wer stellt eine Master ein, wenn KI nichts kostet und mehr weiss? https://t.co/jN5niYIGcG

[Dirk L. @Dirque_L]

The exponential function has the remarkable property that it is the unique function f that satisfies the differential equation f'(x) = exp(x) with initial value f(0)=1.

[Dirk L. @Dirque_L]

@Ni_Zakharov I can't remember when I last did that - in the last few years no journal insisted that I provide the paper in their format.(OTOH you wouldn't believe what shitty LaTeX people write. Moreover, LaTeX isn't all that helpful when it comes to publishing (mostly html these days))

[SIAM @TheSIAMNews]

SIAM Conference on Mathematics of Data Science (MDS26) hotel information is posted. Reserve now! https://t.co/yszAMFkix8
#SIAMMDS26