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Frank Hellmann @various.complexities.eu · 03/07/2026

Naive question: Does this relate to "Free energy minimisation" in the sense of en.wikipedia.org/wiki/Free_en... ? Intuitively I would guess the"Free energy" in that sense is something more abstract...

en.wikipedia.org

Free energy principle - Wikipedia

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Frank Hellmann @various.complexities.eu · 26/05/2026

Auch: Niederschwellige Angebote wie man sich mit begrenzter Zeit einbringen kann. Mehr Leute aktivieren. Ihr seid leider in vielen Teilen der Stadt überhaupt nicht zu sehen gewesen. Und ich wohne nicht besonders weit außerhalb des Rings. Das sind meine Eindrücke.

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Frank Hellmann @various.complexities.eu · 26/05/2026

Nicht zu radikal, aber zu wenig durch dekliniert vielleicht. Warum soll ich außerhalb des Rings dafür stimmen? Was ist der Plan wie es nach dem Volksentscheid aussehen soll? Also positive Visionen für Leute für die "Autofrei" keine intrinsisch positive Message ist. ;)

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Frank Hellmann @various.complexities.eu · 25/05/2026

When trade deals allow companies to challenge domestic laws under arbitration rules, but don't provide for free movement of people, the answer to this question seems pretty clear. And the appetite for EU level of integration that makes free movement of people work appears extremely limited.

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Frank Hellmann @various.complexities.eu · 25/05/2026

Free trade + Free movement of people + tax and regulatory standards + CBAM like mechanisms would be great, but that doesn't really seem to be what the political reality of trade deals is about. The question is one of political economy rather than economics: Who is dis/empowered by the deal?

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Frank Hellmann @various.complexities.eu · 25/05/2026

Politics matter, too. Free trade deals have real dangers. Want to improve environmental or labor protection standards, or tax corporate profits? Companies located where the weakest standards are will win. That's why the EU requires regulatory harmonization. What's the Econ lit take on this?

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Frank Hellmann @various.complexities.eu · 17/05/2026

How much news following do you really need to make an informed decision on whom to vote for every 2 years? That's half a bit per year of information...

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Frank Hellmann @various.complexities.eu · 12/05/2026

This is moving the goalposts. There is absolutely no question that the work done by LLMs, if done by humans, would be considered creative work. Novel uses of established techniques in new contexts is a huge part of math. Often it is only obvious in hindsight that a technique actually fits.

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Frank Hellmann @various.complexities.eu · 19/04/2026

Having generated text/thought about a subject, they don't gain understanding, only more context that needs to be always carefully recreated when following up. You can't blindly trust them, but there absolutely is a place for them in situations where being explicit about the reasoning is the point.

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Frank Hellmann @various.complexities.eu · 19/04/2026

I use LLMs to generate mathematical derivations and proof prototypes, so explicitly demonstrating reasoning is a central part of what I use them for. I don't want to trivialise the problems involved, their failure modes are weird and very different. The boundary of what they can/t do is jagged.

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Frank Hellmann @various.complexities.eu · 19/04/2026

The reasoning of LLMs can be examined in exactly the same way as that of a human colleague: by asking for it. For both humans and LLMs the answer you get will only have a very indirect relationship with the process that generated the answer.

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Tom Brown @nworbmot.bsky.social · 09/02/2026

Solar and batteries are cheap enough that most people can get most of their electricity from them, and save money. This equation gets better and better over time as their costs decline. All details in a new blog post: nworbmot.org/blog/solar-b...

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Frank Hellmann @various.complexities.eu · 15/10/2025

Maybe the time has finally come to link up PyPSA and PowerDynamics, like we promised in proposals 8ish years ago ;)

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Frank Hellmann @various.complexities.eu · 15/10/2025

PowerDynamics 4.0 Release Workshop October 16th 13:00-15:00 CEST - Online Sign up here to find out how to build and simulate sophisticated dynamical models of power grids with Julia: www.listserv.dfn.de/sympa/info/p...

listserv.dfn.de

powerdynamics-release-workshop - Registration for the PowerDynamics Release Workshop (OpPoDyn Projekt) - info

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Frank Hellmann @various.complexities.eu · 15/10/2025

PowerDynamics specifically contains features to initialize a valid initial state from a power flow solution, and an initial model library for power grid components. We have an easy* to use prototype of the IEEE39 bus system. Get in touch if you want to use this! *ish

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Frank Hellmann @various.complexities.eu · 15/10/2025

- Heterogeneous node and edge dynamics - Modular equation-based modeling - Symbolic simplification - Parallel on CPU and GPU (experimental) - Automatic Differentiation compatible (enables NeuralODE on nodes, parameter fitting, sensitivity analysis, optimization of dynamic properties, etc...)

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Frank Hellmann @various.complexities.eu · 15/10/2025

We have released new, heavily reworked versions of NetworkDynamics.jl and PowerDynamics.jl for simulating dynamical systems on networks, and power grids specifically. juliadynamics.github.io/NetworkDynam... juliaenergy.github.io/PowerDynamic...

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Frank Hellmann @various.complexities.eu · 14/10/2025

Congratulations! Incidentally we just released PowerDynamics.jl 4.0, the latest iteration of the dynamics work we started when PyPSA was still young. A more or less complete rewrite and the first version that is actually suitable for Engineering level dynamics studies.

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Tom Brown @nworbmot.bsky.social · 14/10/2025

PyPSA v1.0 is officially here - 10 years and 2 days since the first git commit. This milestone release brings major new features, completely new documentation, and a fresh landing page - congratulations to all the PyPSA team! 🎉 🔗 New Documentation: docs.pypsa.org 🔗 New Landing Page: pypsa.org

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Frank Hellmann @various.complexities.eu · 04/10/2025

Habermas worked extensively on the conditions under which open discourse can establish truths (including moral truths). Discourse Ethics, communicative rationality, and hierarchyless discourse, are key terms. From this analysis the outcome of the internet is maybe not so surprising.

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Prof. R. I. Sujith @risujith.bsky.social · 20/09/2025

This month, CTCS (IIT Madras) & PIK present a webinar: 📢: Dynamics of modern power grids - A complex systems perspective 🎙️: Dr. Frank Hellman @various.complexities.eu, @pik-potsdam.bsky.social, Germany 📅: September 29 |⏰19:30 IST | 16:00 CEST, 🔗: us06web.zoom.us/webinar/regi... #ComplexSystems #phd

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Tom Brown @nworbmot.bsky.social · 19/05/2025

As the hydrogen bubble deflates, what are the alternatives? We present a "minimal methanol economy": using methanol as a gap-filler for the few sectors electrification can't reach. New working paper together with Philipp Glaum, @fneum.bsky.social, @millinger.bsky.social: arxiv.org/abs/2505.09277

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Mike Sowden @mikeachim.bsky.social · 12/05/2025

OK, this is wild. In September 2023, geophysicists across the world started monitoring a very odd signal coming from the ground under them. It was picked up in the Arctic. And Antarctica. It was detected everywhere, every 90 seconds, as regular as a metronome, for *nine days*. What the HELL? 1/

Unsplash image of the Earth, mostly the nightside with a tracery of city lights on every continent.

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