semajian

6 ms·

1.
by semajian 3y ago
I had the same issue with ingesting lots of csv files in a previous version (8.x), though it seemed to be hardware dependent; issue was only on windows not Ubuntu. I think setting the number of threads to low value helped. I had hoped these
2.
by semajian 3y ago
I think Wolfram came up with some new theory of everything based on hypergraphs a couple of years ago, not sure what the current status is though. I would be surprised if it ever becomes a useful theory but hypergraphs are certainly interes
3.
by semajian 3y ago
A quick look at the plots make me think this paper is legit and lk-99 is not a superconductor. Nice plots covering down to low temperature, unlike the original lk-99 papers which always seemed bizarre to me.
4.
by semajian 3y ago
Well, yes
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by semajian 3y ago
It's hard to imagine how this could be faked short of digital manipulation, and it seems implausible that it would be a known high TC superconductor because it would warm up too fast. Absent the former explantation, I'm starting t
6.
by semajian 3y ago
Thanks for linking someone who knows what he's talking about, very painful to see these DFT papers overhyped as some kind of proof... It proves almost nothing
7.
by semajian 3y ago
It's basically an open secret, no one really believes DFT has much predictive power in strongly correlated systems (where relevant electrons cannot be treated as independent). It's not useless, but DFT calculations require many ar
8.
by semajian 3y ago
There are so many bad DFT papers out there because it's cheap to do DFT compared to growing and measuring samples carefully. DFT is notoriously unreliable as a predictive tool in strongly correlated systems, though when electron correl
9.
by semajian 3y ago
A bit too wordy for me, I wish Landau was around to rewrite books like these, they'd be much shorter. Can we get a LLM to make it happen?
10.
by semajian 7y ago
The standard model is basically a description of the fundamental forces, and is usually talked about by particle physicists studying things like the Higgs, quarks, etc. In condensed matter (materials) the only relevant interactions are elec
11.
by semajian 7y ago
Yes, well said.
12.
by semajian 7y ago
I've never come across a physicist who used the term "inertia" to refer to any of the common relativistic quantities.
13.
by semajian 7y ago
Mass is a Lorentz scalar and thus is invariant; the mass of relativistic particles does not increase as velocity increases. One can say the force necessary to keep a constant acceleration increases as velocity increase. This is a common mis
14.
by semajian 7y ago
I guess the most prominent counterexample is Germany, which has basically free tuition. They also have different kinds of high schools preparing people for universities or trades, not everyone needs to go to university.
15.
by semajian 8y ago
I've never seen a number that high in my field, maybe 500 or 600 for the big shots, and even that seems wildly unreasonable to me. Feynman had about 85 peer-reviewed papers over his lifetime, which is less than two per year during his