@Semiclassical I bought the book because it seemed interesting. I didn't get too far into it before returning it. I felt like it was an idea that did not need an entire book devoted to it, and I got bored.

Was it someome here who gave a link about the emergent quantum mechanics book a long while ago? It was a link to a website giving away free copies of the emergent quantum mechanics David Bohm Centennial Perspectives book.

I can't remember if some of you great people could help me remember who is was that would be great. Because I got the book.

This is the book I got

Gosh, guys, stupid question time. If I have an uniform distribution in 1D centered around the origin, then the mean, of course, is zero: $(a+(-a))/2 = 0$ as should be.

Then if I shift it with $+b$, then the mean becomes $((a+b)+(-a+b))/2 = b$, again, nice

But the integral $\int_{-a+b}^{a+b} c*x dx$ should also give me the mean

And it gives $2abc$....

($c$ is like the constant that is uniform)

Why am I dumb? $\int x \rho (x) dx$ IS the mean, isnt it

@Ezze $2abc$ and $b$ are both correct expressions for the mean ;)

@ACuriousMind Now I am even dumber!

Its like... if I push a rod of steel by $b$ then the center of mass shifts by $b$... but my integral wont give me $b$ and I am going crazy

Okay, I'll be more explicit: $c = \frac{1}{2a}$!

Ah

Aha! So the integral of $c$ is not $c$

Site moderators and 25k users have access to site traffic statistics. In the moderator version there's a head disclaimer reading analytics data is intended for moderators only; please don't share the specifics of this data in public. On the other hand, much of this data is in principle publicly available from Stack Exchange Data Explorer. Does anyone know of good queries that reveal such information?

@Qmechanic seriously? there's no such banner that I can see in the 25k version

I would strongly contest the restriction on sharing that data (and have shared such data in the past where it has been useful)

what is the rationale, and what negative consequences would there be when shared?

@EmilioPisanty There is no rationale given, it's just a one-liner banner in the mod version of the analytics

Posts and Votes can definitely be reconstructed in full within SEDE. I don't know of any specific instances. It would take me a couple of hours to reconstruct them if required, though I'd like a good reason to spend that time ;-).

Traffic can almost certainly not be reconstructed.

traffic sources ditto

though, honestly, the data really isn't all that good to begin with.....

data.stackexchange.com/physics/query/341903/…, maybe?

in case it's of interest to folks in this chatroom

One of the world leaders in quantum machine learning, Dr. Peter Wittek, is missing in the Himalayas after his camp was hit by an avalanche. A fundraiser has been started to find funds for a search-and-rescue mission, and any help, however small, would be deeply appreciated.

@ACuriousMind are you from Georgia

@yuvrajsingh No, why would you think so?

@ACuriousMind because you sound like Georgian?

@yuvrajsingh I grew up in the state of Georgia in the US. Maybe you were asking for me? :P

@KyleKanos I do?

@ACuriousMind Well everyone online sounds like they're from Georgia

Asking someone if they're Georgian on an international chat is quite confusing

not if you know which Georgia they're referring to

@EmilioPisanty : It's also not clear to me the rationale why there's restriction on sharing data information. Anyway, my question concerns data from all SE sister sites, not just sites where I already have access.

@ACuriousMind @AaronStevens actually there was a chat going on where any one of you describe his education and about Georgia, I couldn't remember the name, I remember the first letter, so i thought you was as Steven's said it is about him

sup

Actuality @ACuriousMind I was seeking a good book on special relativity.

@yuvrajsingh Didn't I already answer that

amazon.fr/Special-Relativity-General-Frames-Astrophysics/dp/…

it good

@yuvrajsingh I can't make much sense of what you are saying at the end there, but I have not mentioned in any chats about me growing up in Georgia. I was just messing around earlier.

Wait, wait, Stalin was from Georgia?

no that cant be

@Ezze The country, not the state

what do you mean

Im sure he was not from the USA

he was Sakartvelan or something

Thanks, , I am not saying it was you, I said there is one physicists from the Georgia, discussing about his education, and career as physicists.

Georgia I mean country Georgia @Ezze

I dont get it

@Ezze "Sakartvelo" is called Georgia in English...

@ACuriousMind that’s what they want you to think.

arxiv.org/pdf/1907.11167.pdf

Of some interest

No equations

It's more of a review

sigh linking to PDF page instead of abstract page

Fight me

The Princeton library answered my request

Apparently I asked the wrong Princeton library because there are more than one???

@Slereah No

@Slereah So you mean a Princeton library answered your request, no? :P

So it turns out, yes

It is in the Lewis Library instead

trying to find out if they offer digitization services

Lmaoooo

Which one did you ask

Seeley G. Mudd Manuscript Library

I didn't go to any fancy university

We only had one library!

We have many

I’ve only been to Lewis

And even then only the fine hall wing

@Slereah maybe I hid the thesis

Damn you!

You’ll have to come find it yourself

It’s by the category theory books

I have a question ?

I'll hire a bounty hunter

In the second law of motion

Of newton

@Slereah I use "take the dual" to reverse the bounty hunter's arrows.

I'm not 100% sure I can ask for a digitization at the Lewis library

All the services I can find are for either Princeton people or interlibrary loans

It is given as $$f =ma$$

@Akash.B Sounds about right

So if I let a body with a constant velocity to hit me would anything happen to me?

there's a chat thing to ask librarians directly

mb I'll use that

@RyanUnger what time is it in Princetonvania

Here the acceleration is zero so automatically force also becomes zero , right?

@Akash.B When it "hits you", you (the matter of the part of you that is hit) exert a force on it because it can't just magically move through you, and so, by action = reaction, the same force is exerted back on you.

Oh I see

Thanks

"Emily has joined the chat"

Oh boy

Maaan

She's telling me I have to go ask the public library for an interlibrary loan

@ACuriousMind hmm

Well how can I provide it a force

@Akash.B When the object starts to come into contact with you its velocity is no longer constant

Okay @AaronStevens

Acceleration is in opposite direction

So the force should also be in it's direction

@Slereah that's... wow.

Gonna have to visit the local library this week end

@Slereah 11:12

So it should move away from me after touching me right?

@AaronStevens

@Slereah wtf

pretty sure interlibrary loan is in the US only

I asked if it can work outside the US

do you want me to submit a request

Waiting for her response

ok

"Emily has left the chat"

Oh wait

nevermind

lamo

the thesis is in such bad shape idk if scanning it is feasible

it'll be hard to read

and theres a page missing

one page is alright, I suppose

@AaronStevens you bought into the disinformation, Stalin was a farmer in the state of Georgia originally, he's not actually russian that's just what the secret powers want you to believe

@Slereah Nice. But the joke's not exactly new.

"Well the Ukraine girls really knock me out
They leave the west behind
And Moscow girls make me sing and shout
That Georgia's always on my my my my my my my my my mind" - John Lennon, *Back in the USSR*

I wonder if YouTube has a clip of someone singing Georgia On My Mind in a Georgian accent...

I am hongry

Gonna make some borgar and fries for dinner

Dammit, I've been sitting here waiting all day for my new computer to arrive. It still isn't here :/

That sucks. New computer day is one of the best days

Heh, complaining worked! It's here :D

Hah, that's fortunate timing

@ACuriousMind Thank you Satan

Lately, I've been listening to a fair bit of music by a pair of sisters from Georgia (USA): Larkin Poe

Is the disk model of Euclidean space related to the Penrose embedding?"

Disk model of Euclidian space?

yeah

the hyperbolic disk model is more well-known

here are two tilings (of the euclidean plane mapped to a disk):

Grr, I had to run out and buy some new monitor cables before the shops close

and compare it to the hyperbolic disk model

and the penrose diagram:

maybe the penrose diagram and the second euclidean tiling above are related by homeomorphism

that is, one could be continuously deformed into the other and vice versa

interesting how they're both conformal

Well the Penrose diagram is a change of coordinates and rescaling of Minkowski space

I assume the same is true of the Euclidian disk model, but on the other hand those are different geometries

@Ultradark FWIW, I have C code I wrote a couple of decades ago which does that mapping. I'm pretty sure it's a stereographic projection, and they're always conformal, but it's been a while since I've thought about this stuff. (I guess I could boot up my computer & look at the source code).

I've used it to make Circle Limit style images from some of Escher's Euclidean tessellations. The results look pretty similar to his genuine Circle Limit hyperbolic tessellations on the Poincaré disk, unless you know what to look for.

In the Poincaré disk, all (hyperbolic) straight lines become circular arcs that intersect the boundary circle at right angles (that includes diameters as arcs of zero curvature).

FWIW, you can see an example on an old friend's blog page. Unfortunately, it's now corrupted by a Photobucket watermark. But there are several other images on that page that I'm quite pleased with.

IIRC, I learned how to do that Euclidean disk stereographic projection from Penrose's The Emperor's New Mind

Destiny 2 is one of my favorite video games ever.

(I found about it yesterday)

Yeah stereographic projections are conformal

@NovaliumCompany I wish I had time for video games :(

I guess I should qualify that. I wish I had the time for video games given my self-control when I have the option to play video games