dmlerner

i dislike pressing shift, especially on non-ergo (non-thumb) keyboards where it uses my pinky.

Why not ripgrep?

I initially was going to cancel as well - I don't care that much about the fast shipping, and if you hit the minimum order, you get free shipping anyway. But, it means 3% back instead of 5% on the Amazon visa, so if you spend more than 150/12*50=625/month, prime is negative cost. Especially using it for many groceries, I usually hit that.

Can't live without this. The 10% of the time it doesn't work makes me sad. Super useful from cVim/Vimmium etc, I keep it mapped to 'gh'

If you rapidly cool the drink, you're definitely right - energy would flow PCM -> drink. Otherwise, it's semantic if GP is correct. There would be dynamic equilibrium, i.e. flow of thermal energy in both directions, but no true flow from PCM->drink.

The steps would be:

1) Drink > 140, PCM solid

2) energy flows drink -> PCM, drink cools toward 140, PCM liquifies gradually

Then two possibilities:

3a) drink cools to 140-epsilon before PCM liquifies fully

4a) PCM gives energy to drink in dynamic equilibrium, while also losing energy to environment, solidifying

5a) PCM is entirely solid at 140

6a) PCM drops below 140. drink gives energy to PCM and PCM to environment. drink -> PCM thermal conductivity is presumably much higher than PCM -> env, so drink and PCM remain at same temp

OR

3b) PCM liquifies fully before drink hits 140-epsilon

4b) drink and PCM stay at thermal equilibrium (see 6a) while cooling toward 140. energy flows drink -> PCM and PCM -> environment. The former is faster, so the PCM continues liquifying

5b) PCM is entirely liquid at 140. Due to thermal equilibrium, drink is also at 140.

6b) drink stays at 140 while PCM solidifies

7b) see 5a

8b) see 6a

In addition to the normal vaccuum insulation layer, it has a layer that does a (constant-temperature) phase change at ~140F. If your drink is hotter than this, energy flows out of the drink, cooling it and liquifying the layer. If you drink is cooler, energy flows into the drink, solidifying the layer.

grep for technogeek [here](https://joeveo.com/pages/the-temperfect-mug)

You might enjoy the [Aharonov-Bohm effect](https://en.wikipedia.org/wiki/Aharonov%E2%80%93Bohm_effect). Quantum mechanics says we can in fact detect `A`. A similar effect exists for `phi`.

Neat! Any reference you could share for me to read more?

The post is still there

I find this plausible:

..........

> The formula looks at the variables below, and then spits out a "number" for every Googler. Each PA VP gets a % to cut, and as such there is a threshold. Anyone below that threshold gets RIF'd.

Variables are:

1) Location of labor. US Premium Plus was largely impacted versus cheaper areas. 2) Tenure and performance in level. 3) "Runway" of comp. (e.g. base salary vs MRP. eg. .8 of MRP Googlers have a long runway, vs 1.x of MRP Googlers are basically top of band, and 'tenured' with no runway except promo 4) Promo velocity

..........

Taken from https://www.teamblind.com/post/THE-DEFINITIVE-GOOGLE-LAYOFF-...

Disclaimer: Googler, but no particular internal-only information backing my impression of the above

Combine with a blood pressure medicine? Guanfacine is specifically an ADHD treating blood pressure medication.

Blow dryer.

How are you not informed in advance? Every job I've had, there's a contract I sign in advance with all terms, and no addendum on day one. I'd think you could refuse to sign an addendum, and even sue for promissory estoppel if they fire you for not signing.

I honestly forget. I don't think they were ever on probation per se, but it's not like SH was blindsided. There was plenty of awareness that admin was increasingly unhappy. What I won't claim to understand is what pushed them over the line to actually doing it. I think it was more slow, evolutionary decreasing of tolerance for everything than any particular incident.

I'm bitter about the whole thing, and also the upcoming [renovation of EC](https://www.reddit.com/r/mit/comments/nfpumq/east_campus_is_...) (the next dorm over, physically and culturally). The building is realistically past due for some TLC, but it's hard not to feel like it's motivated from more than that.

Admin just doesn't care that much which speakers are allowed on campus. Like many progressive things students loudly champion, it's pretty immaterial and easy to just give in. It's not like it affects MIT's status or funding as a world-leading research institute.

By contrast, Senior House was a significant legal liability due to large, public parties with a habit of sending people to the hospital for more interesting reasons than booze. That, the institute has financial, practical, concrete reasons to care about.

It's unclear to me that SH created more liability than frats and alcohol, but maybe, and it was certainly the perception.

What advantages do hydrogen cars have over ICE or electric? I know very little about them. Electric, optimistically, is cost effective (especially if you have solar panels) and convenient. ICE at least has industry momentum going for it. But Hydrogen? Unsarcastically, why?

> How do I compute this function?

For the kind of problems in physics 101, the Lagrangian is just kinetic energy minus potential energy: L = T - U. This is definitionally true; there's no "why" to that. Think of L as the formal specification of a system. There's no point in asking "why does this mass on a spring have L = 1/2mv^2 - 1/2kx^2": that equation specifies the problem.

In higher level physics, e.g. QFT, there are often identifiably kinetic and potential terms as well. However, there are also often other terms. At that level, you generally write L = sum of the most general possible terms that don't violate symmetries you want the system to have. This ability to work backwards from symmetries to L is to me the more useful perspective on Noether's theorem than going from knowing L to the symmetries.

> Do I define q(s) any way I want, or do I solve q(s) given the constraints of the system?

q(s) is the function which minimizes the time integral of L, and is solved for via the [principle of least action](https://en.wikipedia.org/wiki/Stationary-action_principle), which requires functional derivatives to understand. Most physicists, myself included, only marginally understand the math here and do a bit of hand waving. "d" "del" "delta" potato potahto.

The principle of least action also generates "equations of motion" from L. These are the differential equations that can be solved for x(t).

So, in short: a system is formally specified by its L, which has measurable meaning only because of the principle of least action.

If you didn't specify the principle of least action, or something else, it would be nearly meaningless to give an expression for L. You might as well say: "the mass on a spring has a potato of 1/3kx^97 - 1/2m^8*v^3 + 3". "Nearly" in that at least that would tell me that two systems with unequal potato are different systems.

I imagine it's a similar tradeoff - with more qubits there are more interactions, ergo lower coherence time

And a lower brightness than you can go to without it, for Windows at least. On linux, you can make it happen, of course. Idk about Mac.

Sympy live shell is decent, and the latex rendering is pretty sweet. But, it's on ancient versions of everything, runs slowly, and has a C- UI.

Instead, I use Colab with Sympy + latex output and matplotlib (and most other things you could want to import, pre-installed). It's running new versions of things, and backed by more power, with an option to pay for even more. The latex rendering took a bit of poking around stackoverflow, but works just fine.

Feel free to copy:

https://colab.research.google.com/gist/dmlerner/23543255fdde...

MIT OCW 6.006 talks about this (in much higher resolution than when I last saw!): https://youtu.be/TDo3r5M1LNo?t=2806

An optimal fingering for n notes played one at a time by an F fingered hand can be found in nF^2 time, or I believe n(F^F)^2 if you allow F note chords. "Optimal" in the sense of minimizing a cost function defined in terms of state transitions: c(t, f, t', f') is the cost of playing note t with finger f, followed by note t' with finger f'. E.g. c(a3, 1, b3, 2) < c(a3, 1, b3, 5) because it's unpleasant to scrunch your pinky (5) that close to your thumb. (Notably, t/t' do not mean t_i and t_j, two notes in the piece.) There are papers quantifying such cost functions, apparently.

Side rant -

Having grown up on violin, but learning piano as an adult, (and as a programmer), it kills me to index fingers from 1 (thumb) to 5 (pinky). Violin doesn't use the thumb, so the pointer to pinky are 1->4! Worse, as a Suzuki violinist, I hear (to some approximation) the number of the finger I'm thinking about while playing. Worse yet, I read bass by "adding two" notes to treble, so I get a nice off-by-two to think about with my off-by-one.

I should, uh, probably get a teacher.

Pixel 4a is as close as I know of, albeit 5.8" screen. $350 is hard to argue with, too.

It's 5k/mo/tent, not 5k/mo total.

I think the idea is that the steel/gas price changes would be disproportionate to their real carbon uses.

Any particular gloves you recommend?

Keyboard.io Model 01. Split, layers, thumb clusters, and standard tripod mounts to which I attached Gorilla Pods to get the perfect angles.

I was massively over using my pinkies with laptop modifier/arrow keys, and it's now all thumbs and home row. Took a while to come up with and learn my mappings in a Vim friendly way, but super worth it.

I had significant ulnar nerve pain. Tried PT, weightlifting, sleep braces, a (rather painful) nerve conduction study, stretches...nothing helped much, until the Keyboard.io.

It was "created in a weekend" like I might get this quarter's big new API done in a weekend. Still gotta test, document, bicker over variable names, etc. I imagine "created" is as small a fraction of vaccine development as prototyping code is of software engineering.

As to say, not very "created in a weekend."

keyboard.io atreus? it's a novel layout, not just the standard rectangular grid, but very comfortable. available in a range of switch types.

I love my (three) keyboard.io Model 01s. Thumb clusters, palm keys, ortholinear layout, layers, arduino powered, extensive plugin system, and best of all, standard tripod mounts to which I have attached gorilla pods. (Also RGB, if you're into that.) Keyboards with ~15 degrees of adjustability in one plane are better than nothing, but this gives me full adjustability.

Took me...a while to decide how to map things for Vim + (on linux) i3wm + (on windows) Dexpot (for virtual desktops) and Aquasnap (as a window manager).

Some previous ulnar nerve pain got massively better. Thumbs are just such better digits. Why are we using pinkies for a billion keys?

1 + 2 + 3 + ... = -1/12 total beers

-1/12 beers * $3 / beer = -$0.25

negative -> pay them for taking the beer

The -1/12 result is pretty widely known, but not particularly true. It's called "analytic continuation." There's a nonrigorous proof that's accessible at a highschool level - see [here](https://en.wikipedia.org/wiki/1_%2B_2_%2B_3_%2B_4_%2B_%E2%8B...)

Delightfully, this comes up in string theory, in computing the dimensionality of spacetime.