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00:00 - 06:0006:00 - 10:0010:00 - 00:00

user228700
10:00 AM
@tomph Right, but what is it that made him ask was my question.
 
John Rennie
John Rennie
@Kaumudi.H it's disgraceful how little of classical music is known by the young of today!
 
user228700
@JohnRennie Now you sound like one of those people who always start their sentences with "Kids these days..." :-P
 
John Rennie
John Rennie
Kids these days always say that
Atom Heart Mother
Atom Heart Mother is the fifth studio album by the English progressive rock band Pink Floyd. It was released by Harvest and EMI Records 2 October 1970 in the UK, and by Harvest and Capitol on 10 October 1970 in the US. It was recorded at Abbey Road Studios in London, England, and was the band's first album to reach number 1 in the UK, while it reached number 55 in the US chart, eventually going gold there. A remastered CD was released in 1994 in the UK and the United States, and again in 2011. Ron Geesin, who had already influenced and collaborated with Roger Waters, made a notable contribution...
 
user228700
@JohnRennie Ah, thanks :-)
 
Balarka Sen
Balarka Sen
I am one of the people who also thinks culture and society has gone downhill quite a bit, and I think I can be classified as a "kid of these days"
 
John Rennie
John Rennie
10:05 AM
@Kaumudi.H It was an important album in Pink Floyd's career, though as of today none of the surviving members of the band like it very much.
 
tomph
tomph
@JohnRennie You made my day so far, thanks sir.
 
Sir Cumference
Sir Cumference
@Kaumudi.H Replace the code with this
 
user228700
@BalarkaSen How old are you? :-P
 
user228700
@JohnRennie Interesting...
 
John Rennie
John Rennie
Possibly because it was the first time Pink Floyd had to get outside help (from Ron Geesin) to complete the title track.
Though it is still one of my favourite Pink Floyd compositions. It's a bit cheesy in places, but well it's part of my youth.
Let me tell you all about Pink Floyd. It will only take a few hours :-)
 
Balarka Sen
Balarka Sen
10:07 AM
@Kaumudi It's complicated
 
user228700
@SirCumference The issue persists :-|
 
Sir Cumference
Sir Cumference
@Kaumudi.H Wait, really?
 
user228700
@JohnRennie :-)
 
Sir Cumference
Sir Cumference
It's fixed for me o_O
 
user228700
@SirCumference Yeah. Wait, are you up doing this?
 
Sir Cumference
Sir Cumference
10:08 AM
@Kaumudi.H Nah, I've just forgotten how to sleep
So I'm doing this in the mean time
 
user228700
Are u sure you gave me the link to the correct script?
 
user228700
@BalarkaSen :-| Are u from Narnia?
 
Sir Cumference
Sir Cumference
Well do you see this line in it?
$('#starred-posts').css({'overflow-y': 'hidden', 'height': '100%'});
 
user228700
Yep.
 
Balarka Sen
Balarka Sen
c s lewis is great. big fan.
 
Sir Cumference
Sir Cumference
10:10 AM
Oye, well let's test something
Ok, first, click "show more"
 
user228700
Done.
 
Sir Cumference
Sir Cumference
Can you inspect the element of the star board?
 
user228700
@BalarkaSen Have u read the prequel?
 
user228700
I dunno if I can but I will try.
 
Balarka Sen
Balarka Sen
prequel to which?
 
Sir Cumference
Sir Cumference
10:12 AM
@Kaumudi.H Also, could you send a screencap of the code in the userscript?
 
user228700
@BalarkaSen The major series that he wrote set in Narnia.
 
Sir Cumference
Sir Cumference
I just want to make sure it's installed 100%
 
user228700
@SirCumference Sigh. Are u sure? I can live without that. I really need to apply for my exams...
 
Sir Cumference
Sir Cumference
@Kaumudi.H Sorry then, forget it
 
Balarka Sen
Balarka Sen
I have read the classic seven series in Chronicles of Narnia. Not much more
 
user228700
10:13 AM
@SirCumference How much more time dyou reckon it'll take? It would be good to have it fixed...
 
user228700
@BalarkaSen There is a prequel called...hang on, let me Google it.
 
user228700
Yes, it's called The Magicians's Nephew. It's really cool--it even explains where the cupboard in the first book came from.
 
Sir Cumference
Sir Cumference
@Kaumudi.H Anywhere from 1 minute to "no idea how long"
 
user228700
@SirCumference :-| Alright, what did u want me to do?
 
Sir Cumference
Sir Cumference
@Kaumudi.H Well first, could you screencap the code in the userscript?
 
Balarka Sen
Balarka Sen
10:15 AM
ah, yes, i have read it
 
user228700
Code in the userscript as in the one I copy-pasted from the link that you sent me on to TamperMonkey?
 
Sir Cumference
Sir Cumference
@Kaumudi.H Yep
Just want to make sure it's 100% installed
 
user228700
Sheesh, this is gonna take awhile. Hang on...
 
user228700
 
user228700
@Sir: Dude, u there?
 
Sir Cumference
Sir Cumference
10:28 AM
Sorry, missed it
Sigh...
 
user228700
What?
 
Sir Cumference
Sir Cumference
OK, do you know how to inspect elements?
 
user228700
Nope. Never mind. I'll just live with this :-P
 
Sir Cumference
Sir Cumference
Ok, right click on the starboard and click "inspect element"
@Kaumudi.H You sure?
 
user228700
@SirCumference Alright, then what?
 
Sir Cumference
Sir Cumference
10:31 AM
A little above where you clicked, there should be something saying "<div id="starred-posts" style="height: 100%; overflow-y: hidden;">"
Click on that
Ugh, sorry, I meant "a little above where you're highlighting"
5:32am brain
 
user228700
it says <div id="starred-posts" style="height :225 px; overflow-y;
 
Sir Cumference
Sir Cumference
Yeah, now to the right of it, does it say this?
 
user228700
Nope.
 
user228700
It says height: 225 px
 
user228700
overflow-y: scroll
 
Sir Cumference
Sir Cumference
10:35 AM
Woah
That's gonna take a while to fix
Sorry, I'll have to do it when I'm more awake :/
 
user228700
No problemo! Just forget about it. I'm sorry for having bothered u but I hope u had fun :-P
 
Sir Cumference
Sir Cumference
Nah, it was fun :)
I'm gonna figure out how to fix it soon enough
 
user228700
Okay :-)
 
user228700
Thanks.
 
Sir Cumference
Sir Cumference
np
Ugh, I hate my brain. I only now realized I wrote on my last test "core collapse supernova" instead of "pair instability supernova"
@Kaumudi.H Oh wait, are you sure you pressed "save" when you put in the code?
 
Kenshin
Kenshin
11:21 AM
so what a supernova is a supernova
 
Sir Cumference
Sir Cumference
12:01 PM
@Kenshin The question was about remnants
The former leaves a remnant, the latter doesn't
So the difference is important
 
heather
heather
12:37 PM
hello everyone
school starts again today =(
 
Kenshin
Kenshin
aw noo
do u like school heather
 
heather
heather
eh...i like math class...even though its a bit slow
and i like hanging out with my friends
but otherwise i could do without it =/
 
 
1 hour later…
ACuriousMind
ACuriousMind
1:58 PM
-1
Q: How hard is a Prince Rupert's Drop on the Mohs hardness scale?

RichSI just watched a video of somebody crushing a Prince Rupert's Drop with a hydraulic metal press. https://www.youtube.com/watch?v=A6NUNroyUys The drop dented both the steel bar below the press and the head of his press. It took about 20 tons of pressure to crush the drop. So how hard is a Princ...

pressure material-science
^on-topic? I'm inclined to say that's not a physics question, because the answer would consist just of looking up the value somewhere, if possible.
 
DanielSank
DanielSank
2:30 PM
@heather pobrecito
 
 
2 hours later…
Secret
Secret
4:38 PM
[Abstract algebra] Some useful proof techniques for one sided inverses $uv=1$ and elements $e$ that act like one sided identities for a subset of elements:
Given some expression, a=b, try av=bv and then uav=ubv. One sided inverses means for these sandwich terms in general, they cannot be reversed completely by the pair of left and right inverses, thus opening doors to potential exploration of contradictions (if present)
 
Kelthar
Kelthar
4:48 PM
In the case of 4-position, being spacelike or timelike bears the meaning of possibility of causality. In the case of 4-force and 4-acceleration, these can only be spacelike, but does this bear any physical meaning?
 
John Rennie
John Rennie
@ACuriousMind I think there's more to that question than meets the eye, because I think it involves yield stress rather than hardness. Specifically the yield stress of the glass must have been higher than the steel.
That's interesting because usually glass fractures at lowish average stresses because you get stress concentration at defects and that initiates a crack. It seems very surprising that a Prince Rupert's drop doesn't behave this way.
 
ACuriousMind
ACuriousMind
@JohnRennie Well, that's fine, but the question still just asks what the Mohs hardness of the drop is. Asking what measure of hardness/stress is relevant here would be a far better question.
 
koolman
koolman
Hii everybody
 
rob
rob
@ACuriousMind I think that implicit in those sorts of questions is "can this evidence be used to answer my question, and if so how, and if not why not?" For instance an answer that said "the Mohs hardness of glass droplet is 9.24, goodbye" would probably not satisfy that asker. But converting between engineering hardness scales and physical stress/strain/pressure is nontrivial.
 
Physics Meta
Physics Meta
5:54 PM
0
Q: Is PSE getting "flash mob" questions?

Bill NIn the past couple of days (Jan 1 & 2, 2017), there have been questions asked that have received over 20 votes and over 2000 views. Answers have received dozens of upvotes. Look here and here. While the questions are interesting, although the bridge question is more engineering oriented and coul...

discussion
 
John Rennie
John Rennie
6:05 PM
Relativistic mass again! I find myself unmotivated to go through all this yet another time:
0
Q: If velocity is relative, how can mass (inertia) be coordinate independent?

s1w_Would inertia grow differently if we switch the reference frame? LHC accelerator makes protons x7000 heavier at record speeds and I just wonder if we could change the reference frame (keeping velocity), would its mass be different? (eg. in vacuum, far from any gravitational field). If velocity i...

special-relativity mass velocity inertia
 
Secret
Secret
6:22 PM
[Division by zero]There's a whole can of worms that is hid by the property $0x=x0=0$ in ordinary algebraic structures:
in Mathematics, 2 mins ago, by Secret
in Zero term algebra, 2 mins ago, by Secret
Theorem X1: Division by zero no-go theorem (permutation actions) For any division by zero algebras $S$ with a left (right) multiplicative identity. If there are two distinct elements $a,b \in S$ such that their left (right) magma actions induces distinct permutation to the underlying set, then it is not interesting.
in Zero term algebra, 3 mins ago, by Secret
Proof: Suppose the element $e$ is an additive identity (possibly one sided). Then by Theorem 9, $ae,be$ and/or $ea,eb$ are also identities. This ensures the addition structure to contain a one sided null semigroup of size 3, therefore it is not interesting by the definition of not interesting.
Basically, once zero terms are allowed, you can end up having new identities generated by the distributive law
Moreover, by Theorem 7, all finite associative structures that has a zero inverse must have unique zero terms, hence $0^2$ becomes an identity
 
 
1 hour later…
DanielSank
DanielSank
7:34 PM
@heather FYI the buzz on the numpy mailing list is that they're talking about depricating the matrix type. So, don't use it. Use arrays :)
 
vzn
vzn
7:48 PM
@DanielSank (?!?) lol, maybe because matrices are so obscure/ arcane :P
 
dmckee
dmckee
8:04 PM
@JohnRennie But this time he's heard of invariant mass and is not getting that the two ideas are alternatives.
 
DanielSank
DanielSank
8:31 PM
@vzn there's just no point since arrays cover the same cases.
 
DanielSank
DanielSank
8:42 PM
@vzn I'm not sure what you mean by matrices being obscure.
 
Physics Meta
Physics Meta
9:11 PM
1
Q: When should Moderators close questions?

sammy gerbilI have recently found instances of Moderators closing questions (which of course occurs with their single vote) instead of leaving them to be judged by the Community in the Review Queues. For example : How can the space needle tower have it's centre of gravity underground? How to calculate work ...

discussion policy vote-to-close moderation
 
heather
heather
9:35 PM
@DanielSank no more matrices!? =/
@DanielSank, also, awkward moment of the day here
 
vzn
vzn
9:50 PM
@DanielSank not an expert on this. was joking. tend to use ruby myself. sounds like the intro of the matrix class was a in-retrospect questionable design decision. it would be interesting to compare class interfaces.
 
HDE 226868
HDE 226868
@JohnRennie Thanks for commenting here. It's always nice to have folks from Physics looking at Worldbuilding questions.
 
vzn
vzn
agreed they are quite similar, but a quick look, the matrix class supports (eg) multiplication, not supported (directly) by arrays. so how do they propose to handle the matrix-specific methods? docs.scipy.org/doc/numpy/reference/generated/numpy.matrix.html
 
Mostafa
Mostafa
@DanielSank I guess your comment here has become obsolete, with a diagram coming from nowhere! :-)
 
DanielSank
DanielSank
@heather They're talking about the matrix type. They're not necessary because you can have two-dimensional arrays.
 
heather
heather
@DanielSank, I know, but, convenience...=)
 
DanielSank
DanielSank
10:01 PM
@heather Ahahahahahahahaha
@heather Yeah but they have a different interface than arrays, so don't use them.
 
heather
heather
@DanielSank methinks I'll have to update some code (that's why I was talking about convenience/laziness)
 
DanielSank
DanielSank
@heather Ah. Yeah, don't use the matrix type.
Like, ever.
 
heather
heather
@DanielSank 'a soft, comfortable couch' plus a link to lemaitre.
 
DanielSank
DanielSank
Especially since it's probably going to die.
 
heather
heather
point: proven.
@DanielSank yeah, i'll update it.
 
DanielSank
DanielSank
10:03 PM
In python 3 there's a new binary operator @, which will do matrix multiplication when acting on two two-dimensional ndarray's.
:D
 
heather
heather
ooooooooh! =D =D
that makes me exceedingly happy.
@ I've got to remember that.
 
DanielSank
DanielSank
Yeah, py3 FTW.
Oh, by the way, during my vacation I finally figured out how to write an event loop!
 
heather
heather
yay!
vacation =)
event loop =) =)
 
DanielSank
DanielSank
lol
 
heather
heather
for a second, i thought that said "clappy"....
 
DanielSank
DanielSank
10:15 PM
heh
cappy is a little joke to myself. It means "crappy capabilities protocol".
So "cap-" for "capabilities" and "-ppy" for "crappy".
 
heather
heather
10:30 PM
ah, gotcha =)
 
DanielSank
DanielSank
Yeah, the point of the project is to build a capabilities system that's reasonably simple and e.g. suitable as an example of how capabilities sytems work.
You know... good enough for prototyping a project, but maybe not something you'd use for a big production system.
In other words: good interface, but maybe not so good implementation.
 
heather
heather
interesting, that's cool.
 
DanielSank
DanielSank
Yah, capabilities are the future IMHO.
At least, I hope so.
 
DanielSank
DanielSank
10:47 PM
@heather Is there a way to tell IPython to use __str__ as the default printer instead of __repr__?
 
David Z
David Z
@DanielSank Isn't that only 3.5 and up, or something like that?
 
DanielSank
DanielSank
@DavidZ Yeah, something like that.
 
rob
rob
-1
Q: Strong nuclear force vs. neutralization of electric charges in electron-proton interaction

HolgerFiedlerI'm curious of which inconsistencies in observable phenomenons will there be if the model of strong nuclear force between protons in the nucleus will by changed by a model in which the proton's and the electron's electric charges in atoms neutralize each other? So for example the energy content o...

electrons electric-fields atomic-physics strong-force
Close as non-mainstream? Or answer that such a model would predict that ionized nuclei are unstable?
 
heather
heather
@DanielSank, I haven't used IPython, so I don't know.
 
DanielSank
DanielSank
k
0
Q: Tell IPython to use an object's `__str__` instead of `__repr__` for output

DanielSankBy default, when IPython displays an object, it seems to use __repr__. __repr__ is supposed to produce a unique string which could be used to reconstruct an object, given the right environment. This is distinct from __str__, which supposed to produce human-readable output. Now suppose that for ...

ipython repr
 
David Z
David Z
10:53 PM
I'll look it up
 
ACuriousMind
ACuriousMind
@rob I don't really understand what the "model in which the proton's and the electron's electric charges in atoms neutralize each other" is supposed to be to begin with and would close as "unclear what you're asking", but you seem to know what the user is talking about. If you can say "this model would predict X, but we observe Y", then I'd say it's allowed since the non-mainstream close reason explicitly allows specific questions.
 
DanielSank
DanielSank
@DavidZ related indeed.
I had seen that post.
 
David Z
David Z
I figured it was worth linking in case it prompts someone to find the solution
 
DanielSank
DanielSank
@DavidZ yeah
 
Physics Meta
Physics Meta
11:35 PM
1
Q: Downvotes without explanation

YildizRecently I have posted the question Einstein-Hilbert action as an effective field theory. I have received a lot of downvotes and it's ok because it was unclear: in order to repair I tried to close it opening a more precise one of the same but now they are downvoting both. I would like to know wha...

discussion support
 
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