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Dirk Lorenz

@dirque.bsky.social

1K followers 480 following 510 posts

Doing mathematics, also as a job. Now at Uni Bremen, was at TU Braunschweig. Only here for the math. Optimization, inverse problems, imaging, learning - stuff like that.

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Reposted by Dirk Lorenz

Pieces of Mathematics @pcsofmath.bsky.social · 11d

Do you feel that the mathematics community is welcoming to enthusiasts who are self-taught or do not have formal mathematics education?

1. Yes, very welcoming.
2. Somewhat welcoming.
3. Somewhat unwelcoming.
4. No, not welcoming at all.

Reposted by Dirk Lorenz

Pieces of Mathematics @pcsofmath.bsky.social · 11d

The mathematics community includes people from many backgrounds, including self-taught learners and those without formal education. While many parts of the community are supportive, some environments may feel exclusive. Please share your experiences.

Dirk Lorenz @dirque.bsky.social · 14d

Kochendes Wasser in größeren Mengen und länger schrubben ist auch das einzige was ich kenne.

Reposted by Dirk Lorenz

Petra Schwer @petraschwer.bsky.social · 20d

What does it mean to do mathematics?
Read my personal answer here:

web.mathi.uni-heidelberg.de/content/uplo...

#mathsky #math #question

web.mathi.uni-heidelberg.de

Dirk Lorenz @dirque.bsky.social · 28d

I wasn't talking about this guy! He definitely knows, but is just as annoyed as I am by badly chosen definitions

Dirk Lorenz @dirque.bsky.social · 28d

So you agree that the sine function is not decreasing, but you won't say that it's non-decreasing? But alas math has such a precise language! 🧮

Thomas Steinke @stein.ke · 28d

Why do we use "non-decreasing" as a synonym for increasing? The negation is confusing. E.g., the sine function is not decreasing. Is the distinction between strictly and non-strictly increasing meaningful?

Dirk Lorenz @dirque.bsky.social · 28d

That's the first time I hear it like that!

Dirk Lorenz @dirque.bsky.social · 28d

What would be the difference between increasing and monotonically increasing?

Dirk Lorenz @dirque.bsky.social · 28d

I also never got this. I if would be in charge of naming things, it would be positive for ≥0 and strictly positive for >0 and same for increasing and strictly increasing.

Reposted by Dirk Lorenz

Adrienne Hestenes @ahestenes.bsky.social · Sep 6

Ta daaa! I give you the Lorentz Attractor thanks to the free pattern from #ThreadedTheorems and also @samjshah.bsky.social whose posted work I admired.

#StemBroidery #MathArt #MathSky

An embroidery in a circular hoop of the Lorentz Strange Attractor. Embroidered using backstitch and variegated thread of colors aqua, indigo, and pink. The pattern loops around giving a two lobed appearance of a butterfly.

Dirk Lorenz @dirque.bsky.social · Sep 7

Awesome!

But since I share the last name I can't resist to add that it's akshually "Lorenz attractor" 😅

Reposted by Dirk Lorenz

siagdata.bsky.social @siagdata.bsky.social · Aug 11

Join us for a panel on “Careers in Mathematics of Data Science” tomorrow morning!

siagdata.bsky.social @siagdata.bsky.social · Aug 1

Save the Date!

The SIAM Activity Group on Data Science (SIAG/DATA) invites you to join us for a panel on the topic:
Careers in Mathematics of Data Science
Tuesday, August 12, 2025 | 9:00 AM PT | Zoom Webinar
Panelists: Marta D’Elia, Elizabeth Newman, David Uminsky

Welcome! You are invited to join a webinar: Webinar on the Mathematics of Data Science. After registering, you will receive a confirmation email about joining the webinar.

Panel: Careers in Mathematics of Data Science Join us for an engaging panel discussion on careers in the mathematics of data science, featuring experts from academia, industry, and national labs. Thi...

Reposted by Dirk Lorenz

siagdata.bsky.social @siagdata.bsky.social · Aug 15

Our latest WebMDS webinar was a blast!

Check out our panel discussion of "Careers in Mathematics of Data Science" on youtube:

youtu.be/qdlJJLT4ddQ?...

Panel: Careers in Mathematics of Data Science

YouTube video by Society for Industrial and Applied Mathematics (SIAM)

Reposted by Dirk Lorenz

siagdata.bsky.social @siagdata.bsky.social · Aug 1

Register at siam.zoom.us/webinar/regi...

Welcome! You are invited to join a webinar: Webinar on the Mathematics of Data Science. After registering, you will receive a confirmation email about joining the webinar.

Panel: Careers in Mathematics of Data Science Join us for an engaging panel discussion on careers in the mathematics of data science, featuring experts from academia, industry, and national labs. Thi...

Reposted by Dirk Lorenz

siagdata.bsky.social @siagdata.bsky.social · Aug 1

Save the Date!

The SIAM Activity Group on Data Science (SIAG/DATA) invites you to join us for a panel on the topic:
Careers in Mathematics of Data Science
Tuesday, August 12, 2025 | 9:00 AM PT | Zoom Webinar
Panelists: Marta D’Elia, Elizabeth Newman, David Uminsky

Welcome! You are invited to join a webinar: Webinar on the Mathematics of Data Science. After registering, you will receive a confirmation email about joining the webinar.

Panel: Careers in Mathematics of Data Science Join us for an engaging panel discussion on careers in the mathematics of data science, featuring experts from academia, industry, and national labs. Thi...

Reposted by Dirk Lorenz

Ben Grimmer @profgrimmer.bsky.social · Aug 4

I've invented a simple, lovely math puzzle I expect every AI fails:

Suppose you're a mathematical sailor at sea on a boat that has a perfectly cylindrical hole in the floor. All you brought is a collection of every p norm ball except p=2 (drat!). What do you do to cork the hole and save yourself?

Dirk Lorenz @dirque.bsky.social · Jul 16

Yes! (But without the sometimes unbearable attitude.)

Dirk Lorenz @dirque.bsky.social · Jul 16

I can't help with that, but my experience is that ChatGPT is quite good with such stuff.

Dirk Lorenz @dirque.bsky.social · Jul 16

I would give some AI a try. Ask, e.g., ChatGPT to generate some Python code (or whatever language) according to your instructions. If you don't have Python installed, use Google Colab to run it.

Dirk Lorenz @dirque.bsky.social · Jul 7

A: A mathematical statement/concept makes intuitive sense.

B: There is a sound framework where a mathematical statement/concept can be proven/defined.

I tend to believe that

A ⇒ B,

but not vice versa.

(Thinking about Dirac's delta and the Banach-Tarski paradox, for example.)

#🧮

Dirk Lorenz @dirque.bsky.social · Jul 1

If it's an exponent, yes.

Dirk Lorenz @dirque.bsky.social · Jun 25

I still did not subscribe to d(Amazon)/dx…

χle Ormsby @motivickyle.bsky.social · Jun 25

In Leibniz notation, his name is d(Optimus)/dx.

Dirk Lorenz @dirque.bsky.social · Jun 23

Depending on what the first two are, either HU, FU, or TU (Humboldt, Freie, Technische)

Dirk Lorenz @dirque.bsky.social · Jun 23

Berlin and Hongkong are definitely on the list

Reposted by Dirk Lorenz

Eigenraum @eigenraum.bsky.social · Jun 19

Die Frage P=NP? ist eines der Milleniumsprobleme und somit lohnenswertes Ziel für Hobby- und Profimathematiker:innen.
www.claymath.org/millennium/p...

🧵

P vs NP - Clay Mathematics Institute

If it is easy to check that a solution to a problem is correct, is it also easy to solve the problem? This is the essence of the P vs NP question. Typical of the NP problems is that of the Hamiltonian...

www.claymath.org