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1:09 AM
@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.
 
 
1 hour later…
2:32 AM
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
 
 
6 hours later…
8:39 AM
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: $c = \frac{1}{2a}$!
 
9:01 AM
Ah
Aha! So the integral of $c$ is not $c$
 
 
2 hours later…
11:02 AM
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?
 
 
1 hour later…
12:30 PM
@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.....
 
12:53 PM
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?
 
1:10 PM
@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
 
1:14 PM
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
 
Actuality @ACuriousMind I was seeking a good book on special relativity.
 
@yuvrajsingh Didn't I already answer that
it good
 
1:24 PM
@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.
 
@Ezze Georgia the country?
 
1:33 PM
Georgia I mean country Georgia @Ezze
 
I dont get it
 
@Ezze "Sakartvelo" is called Georgia in English...
 
1:56 PM
@ACuriousMind that’s what they want you to think.
 
No equations
 
It's more of a review
 
sigh linking to PDF page instead of abstract page
5
 
Fight me
The Princeton library answered my request
Apparently I asked the wrong Princeton library because there are more than one???
 
2:15 PM
@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
 
2:34 PM
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.
 
2:47 PM
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?
 
2:52 PM
@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
 
3:08 PM
@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
 
3:12 PM
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
 
3:13 PM
"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
 
3:38 PM
@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 :/
 
3:58 PM
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
 
4:43 PM
0
Q: How to get a direct link to a particular answer?

corcholatacolormarengoI'm kinda sure that I have seen direct links to answers posted before. How can I get a link to a particular answer? Or am I wrong?

 
 
1 hour later…
5:51 PM
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
 
6:21 PM
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
 
6:54 PM
Destiny 2 is one of my favorite video games ever.
(I found about it yesterday)
 
Yeah stereographic projections are conformal
 
 
3 hours later…
10:26 PM
@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
 

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