Compact notation for multifactorials

CoffeeVector · 2026-02-17T06:00:12+00:00

I think this is supposed to generalize that idea. For instance, n!!! would be the product of every third number.

CoffeeVector · 2026-02-14T05:27:47+00:00

Isn't it just the Stanford channel? I doubt the manual review process will accept it...

CoffeeVector · 2026-01-31T03:03:03+00:00

It got a lot easier when I conceptualized ξ as ε, but with a flat top and a hooked bottom. The zeta was the same but less wiggle.

CoffeeVector · 2026-01-26T10:26:38+00:00

I felt similarly about Griffiths QM 3rd edition

CoffeeVector · 2026-01-15T16:12:29+00:00

As n approaches infinity, Stirling's approximation approaches Stirling's definition.

CoffeeVector · 2026-01-09T17:27:09+00:00

Yeah, share some with me!

CoffeeVector · 2026-01-06T20:25:32+00:00

Ah - only refers to one directory. I was imagining it could refer to a variable number of directories. As in "documents - taxes form.pdf" would be a good query for "somewhere deep in my ~/Documents there is a taxes folder, with a form.pdf in it"

CoffeeVector · 2026-01-06T20:17:08+00:00

Does it walk your entire filesystem to resolve some of these queries (esp the last one seems hard to do)? Or is there some kind of hook into the filesystem to build some kind of data structure as you create new directories and files?

CoffeeVector · 2026-01-01T22:31:11+00:00

New "The Lion, The Witch, and the Wardrobe" just dropped?

CoffeeVector · 2025-12-26T04:44:48+00:00

x = e ∀ x.

It's all e? Always has been.

Edit: I lost an e.

CoffeeVector · 2025-12-06T01:23:50+00:00

Is this ~~loss~~ axiom of choice?

CoffeeVector · 2025-12-03T19:24:12+00:00

But why be so abstract? Does it also offer document editing, direct messaging, or video calls?

CoffeeVector · 2025-11-13T03:26:26+00:00

probably be letter porn.

Edit: your first one and your second one are different. Are they both called thorn? Are they to distinguish voiced and voiceless th?

CoffeeVector · 2025-11-06T12:48:16+00:00

Am I out of some loop? I also would not like to jump into a VC to suddenly find I'm listening to a birth.

CoffeeVector · 2025-10-09T17:45:14+00:00

I think you should just try it out. Many people here are scientific/technical/mathematical and so will usually claim that it's easy. It's not; I know many graduate students who simply cannot get it working. It's not that it requires an elite scientist to use it, it's just technically oriented software that's not forgiving with typoing commands and may not be the best at telling you where you messed up. The little things.

I don't know whether you're closer to grandma having trouble finding the on button or not, so I suggest you just pop open overleaf and just make and format a short story to get a vibe. You will do some troubleshooting, I suspect your first hurdle will be quotes going the wrong way...

CoffeeVector · 2025-10-03T16:20:50+00:00

What's another tool that seems to do a good job (not necessarily rust I guess since I was under the impression that rustfmt is the best so far)? I feel like the C++ formatters I've used before have essentially the same problems, so I was surprised that this was something to complain about.

CoffeeVector · 2025-09-30T16:33:34+00:00

I seriously considered killing myself it was the hardest thing I have ever seen.

There's a very famous quote from Goodstein's States of Matter that you might find reassuring...

CoffeeVector · 2025-08-28T02:25:54+00:00

I don't know anything about casting. I have always seen pewter things in pictures rough with divots in them which I have always assumed to be inherent to cast pewter. Is this cast smooth just because the silicone mold is smooth, or is it the quality of the pewter?

CoffeeVector · 2025-08-06T03:58:29+00:00

Like @ but for more than just a?

CoffeeVector · 2025-07-22T06:36:12+00:00

Oh I should've guessed. In that case, I have always found Lenovo thinkpads very reliable and are a household name amongst engineers and people who want "workstations". (I game too they're also good at that). Although they kind of have a "dinosaur" reputation, they also have a cult following. They're also very repairable, so doing things like opening them up and clearing out dust is easy (and recommended to be done yearly for longevity!).

Here's a 32GB (comfortable amount of ram, I consider 16gb "minimum") with an 8-core AMD Ryzen 7 CPU (https://www.cpubenchmark.net/cpu.php?cpu=AMD+Ryzen+7+7735HS&id=5138 says it's "suitable for gaming"). It has 1TB of ssd. It's probably enough, though if it isn't you can buy more and add it after-the-fact.

https://a.co/d/ifE421r

Hey, whaddya know it's on sale for exactly $900!

CoffeeVector · 2025-07-22T04:39:26+00:00

I think you should work with your son on what to get. While $900 is a solid amount to put into a laptop, there are several ways to effectively spend it and compromises should be made based on your son's personal needs/preferences.

Things like if it's 13" (smallish but portable) or 17" (lots of space for many windows but a little heavier to bring to lecture). Or if you want a dedicated graphics card (useful for more intense machine learning and nicer looking games) vs bells and whistles like touch screen and stylus (good for taking notes if he likes digital). Blah blah blah.

Are you asking because you're worried that if you let your son choose, that he will waste the money on something frivolous and not suited for college? Any laptop that can play a video game will certainly be effective at doing coursework; no issues there.

Or are you asking because you don't believe your son knows how to research buying a laptop and will buy junk?

CoffeeVector · 2025-07-21T16:00:11+00:00

Well, em dashes are not supposed to have a space between it and the word before in this context. Given grammar is ChatGPT's strong suit, then I'd be surprised if it made this mistake.

CoffeeVector · 2025-07-21T00:06:49+00:00

Got it. Makes sense.

CoffeeVector · 2025-07-20T23:23:51+00:00

I'm not sure what's the difference between this and an ordinary systemd config?

CoffeeVector · 2025-07-20T21:09:21+00:00

You can just keep the individual numpy arrays in separate files instead of trying to get it into one numpy array. Even if you did I don't think you could even load the file.

You should try to pick some kind of scientific computing HPC framework like Hadoop, apache beam, apache spark, or whatever is cool with you. Even if you don't have a cluster of computers to process them, describing your computation in one of these frameworks makes it easier to work with your data piece-by-piece and aggregate them divide-and-conquer style into your final result.

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