Shubhendu Trivedi

Programmed periodic re-reading

A list of all 230, very simply presented. en.wikipedia.org/wiki/List_of...

3:

Round 2:

The mathematical structure here is quite interesting, but probably not worth to get into for a thread. In the meantime, can just use the Conway book as a copout, which covers them in the first ~quarter or so (although it's also a bit too cute).

This isn't exactly trivial given that there are 230 such groups, and you need to be able to search efficiently over them (allowing distortions). As an aside: For 1D they are known as Frieze groups (total 7), wallpaper groups (total 17) in 2D. Same math, just different dimension.

Came across this very cool library (via Cindy Zhang):
spglib.readthedocs.io/en/stable/

If you have atom coordinates and lattice parameters, spglib identifies the crystal symmetry for you quite efficiently and reliably.

Article describing how the search proceeds www.tandfonline.com/doi/full/10....

📣 #ICML tutorials: We want to know what *you* would like to learn. This year, Adam White and I are calling for nominations of topics and/or presenters.

Until December 7th, you can send us your suggestions, and we will use them to shape the program.

icml.cc/Conferences/...

Implementation and Abstraction in Mathematics This manuscript presents a type-theoretic foundation for mathematics in which each type is associated with an equality relation in correspondence with the standard notions of isomorphism in mathematic...

"Canonically" can be formalized in many contexts. arxiv.org/abs/1407.727...

Don't have a picture handy of the other Iliads on the phone, but they exist. Fighting for princesses written on thick paper just reads better. Different ones reads at different speeds -- 0.25x, 0.5x, 0.75x. So much alpha!

Another reality is people getting multiple tacky (but I like them) hardcovers, and placing them randomly next to Darwin.

विकलांग श्रद्धा का दौर

markets have the qualities for this: cheaper, more sensitive to global growth/trade themes (if risk appetite improves, they could go up more). Weaker USD means you get an extra lift. Basically, those numbers are IMO valuation differentials playing out under a shared macro (debasement) constraint.

In such a regime (and it clear it exists), investors would need to move away from low-growth/low-return assets (bonds, perhaps US equities if they are perceived to be over-valued) and into assets where the upside will be amplified if things work out (so risker, hence higher beta). Most of the listed

The Debasement Trade Broadens Across Precious Metals In October, gold closed above $4,000 and silver hit record highs amid growing strategic demand, signaling a sustained shift away from fiat-based assets. Major developed economies are increasingly oper...

As an aside: The debasement story is coming from the fact that you are teetering at the brink of a duration crash (for long end bonds) across most developed countries. Gold is up 53% YTD, Silver 68%, Platinum 73%, Palladium 57%. BTC, also known as levered QQQ, has fallen since this became clear.

Thus a charitable reading could be "capital flight due to policy risk," but that comes from a combination of long end yields (across G20), FX, and flows (also into other risk-off assets, like gold) -- it doesn't directly follow from the chart. "Stocks == reflection of policy" is very fraught.

At best you can say that US assets are being treated as the funding leg/epicenter of the debasement trade (sell treasuries, sell dollar, reduce US equity overweight--since they are extremely over-valued--rotate to cheaper markets). ex-US equities are the higher-beta expression of that exact trade.

Yields have been telling you that everyone's policy mix (fiscal expansion, less leg room for central banks) has deteriorated. The chart is IMO telling you how investors, having reached the conclusion of a debasement signal, are reallocating across countries and their currencies (chart is in USD).

This chart IMO is showing a rebalancing story under the constraints of a wider global debasement trade. it is not showing a policy story (at least not directly). Stocks don't reflect policy in the short term, they reflect allocations. Yields are a better barometer, and you see them degrade all over.

Exciting! Dark Energy Survey collaboration releases first paper demonstrating power of simulation-based inference for cosmological large scale structure!
arxiv.org/abs/2511.04681

The flow always seems to know the news before it happens.

Hopefullly they also include test of space awards.

Hopefully the CS people are able to teach the economists to give authorship to the RAs!

Thinking of White Nights, Netochka Nezvanova, Notes from the underground. All feature restless night walkers who still have that gaze, but it turns inwards, and noctural half-light has a similar role in exploring spaces of ambiguity. It wasn't really a genre in Russia too, before that.

I haven't read Dostoevsky since I was 22-24, but always felt his early works developed around night light similarly, but focused inward i.e. noctural lighting didn't serve to illuminate the ambiguity and underside of modern life (via the sociological gaze of the picaro character), but of the self.

For a second, I was confused! Since you used the air code. But you never know with Midwesterners, and I normally hear that from very reasonable people about SF (which is very beautiful).

It's similar to how there are these images of "crimes in NYC" safest city in the US.

How to Build a Working Digital Computer : Free Download, Borrow, and Streaming : Internet Archive How to Build a Working Digital Computer, by Edward Alcosser, James P. Phillips, Allen M. Wolk. From Hayden Book Company, Inc. New York. Includes Introduction,...

A book from 1968: "How to build a working digital computer," specifically aimed at readers with no background in computers (including hobbyists, secondary school students). The goal is to "build a computer" using household items like lamps, paperclips etc. archive.org/details/howt...

Turns out Friday nights and weekend mornings are just for reviewing papers.

That was the fag end of the era when Enfields personified a different (almost austere) character. Had no electric starts, were extremely heavy, and had this violent back-kick (could seriously injure your leg if you did not kick properly). Needed great care. Now they are just another mass object.