This post is an echo of voices from the distant past, prompted by a tweet by Fernando Rosas. (It’s also not entirely fact-checked and somewhat tongue-in-cheek.) Emergence is trivial! Emergence is what makes it possible to have different levels of description. Biologists can discuss cells; medical scientists can talk about tissues made of millions of […]
Category: complex systems
For the love of hens
In the first few years of the last century, during his summer breaks at a farm, Norwegian schoolboy Thorleif Schjelderup-Ebbe spent time observing chickens. He noticed that when hens peck on each other—as they do when they fight, typically about food—they follow specific patterns. If hen A pecked on hen B, B would not peck […]
How the names of quantities influence their interpretations
In my and adjacent research fields, measures and methods and their names have complex and sometimes detrimental relationships. This is especially true when the names have a clear and relevant meaning in the vernacular. There are several related mechanisms for which I have only scanty evidence (hopefully to be supported further in the future): The […]
What complexity science is, and why
I also posted this post on arXiv, in a more reader-friendly layout and somewhat shaped-up writing. This is a post/essay about understanding complexity science, via some peculiarities of the field, as a meeting place for a special kind of scientist. It is the result of my nostalgia-driven hobby of reading popular-science complex systems books, and […]
Faraway, so close! Nobel prize to complex systems
Yesterday, it was announced that Syukuro Manabe, Klaus Hasselmann, and Giorgio Parisi get to share the 2021 Nobel prize in physics. Woo hoo! I had a smile on my lips running through the night streets of Tokyo (my usual exercise). The best part is the motivation: “For groundbreaking contributions to our understanding of complex physical […]
Minds, Machines and Herbert Simon
Our designed reality Two years late to the party, I discovered the brilliant review paper “Machine Behavior” by Iyad Rahwan and an all-star cast. Its premise is that we need to let systems relying on artificial intelligence be scientific study objects in their own right, even though they are, to some extent, engineered. The article […]
{complex [systems} theory]
(This is a light-hearted and ill-researched post. When the infinite amount of free time I ordered on Amazon finally arrives, I might dig into it deeply and be serious.) Everyone who tries to read widely about systemsy stuff will inevitably feel puzzled by the large-scale flow of ideas. In particular, there is a—sometimes crystal clear, […]
Do you believe in ghosts?
I do. In the sense of phantom traffic jams—traffic jams without a bottleneck, that just emerge spontaneously (and with peculiar density characteristics—more below). The most fundamental feature of highway traffic is the “inverse-λ shape” flow-density diagram. Flow is the number of vehicles that pass a point along the road. Density is how many cars there […]
10 papers of the 10s
Here I will list my ten favorite papers of the 2010s related to my research. It’s not an ordered list, and it will not be too serious, so don’t hate me if your paper is not on the list. Here we go: R Bliege Bird, E Ready, EA Power, The social significance of subtle signals, […]
Hierarchies and networks
We, scientists, love the word “hierarchy.” In every professor, it evokes a picture of us chalking up a pyramid on the blackboard and confidently explaining, “at the top, we have the …” Hierarchies are systematic and meaningful orderings. They are the successful ends of research projects, and bringers of peace to our curious minds. They […]
Petter Holme 