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heather
heather
12:08 AM
@ACuriousMind i suppose so =P
 
0celouvskyopoulo7
0celouvskyopoulo7
@ArtOfCode does that close chrome?
I have important tabs open
 
heather
heather
"where r and p specify the stoichiometry of the reactants and products, respectively. We require the net change ∆ρ = p − r of a reaction ρ = (r, p) to be nonzero. We will usually write a reaction using the “reactants, right arrow, products” notation; for example, ρ = A + B → C (in this example r = (1, 1, 0) and p = (0, 0, 1))."
how can $\Delta\rho = \mathbb{p}-\mathbb{r}\neq 0$?
I thought the idea behind stoichiometry was that the two sides balanced.
aka, subtracting = 0
 
0celouvskyopoulo7
0celouvskyopoulo7
please don't stoichiometry
and why are $p$ and $r$ upright
 
ACuriousMind
ACuriousMind
@heather I have no idea what that quote is trying to say, I'm afraid
 
heather
heather
@0celouvskyopoulo7, because they're vectors
@ACuriousMind would it be better if I linked the paper it came from?
 
ACuriousMind
ACuriousMind
12:17 AM
Perhaps, but I'm about to go to bed, not gonna read that now, sorry
 
heather
heather
@ACuriousMind, sure, sorry. have a good night!
 
0celouvskyopoulo7
0celouvskyopoulo7
12:29 AM
@heather what
then you write $\mathbf p,\mathbf r$
 
heather
heather
i did \mathbb{} is that not right?
 
0celouvskyopoulo7
0celouvskyopoulo7
no
\mathbf
 
heather
heather
oh.
sorry
 
0celouvskyopoulo7
0celouvskyopoulo7
 
rob
rob
12:56 AM
0
Q: Calculating the efficiency of photosynthesis indoors vs. outdoors

LennartI want to defend a contention that it might be more efficient to use solar panels coupled with LED lights emitting photosynthetic active radiation on plants than it is to grow plants outside. But I have difficulty asserting a probability regarding the necessity of ten or more quantum. To understa...

quantum-information photovoltaics
I'm having trouble parsing this question. It's been flagged for migration to Biology, presumably because it's about growing plants, but I think it's just as plausible that the question is about the LED/power conversion efficiency or the end-to-end calculation. Should the question be kept here? moved to biology? closed as unclear? Thanks for your guidance.
 
Sir Cumference
Sir Cumference
1:15 AM
@heather So, uh...willing to try it?
 
heather
heather
@SirCumference, I don't have enough room on the chromebook to download everything - I'm really sorry.
 
Sir Cumference
Sir Cumference
@heather Don't worry about it :P
 
heather
heather
it does appear very useful however, so kudos to you for doing the work on it!
 
Sir Cumference
Sir Cumference
Thanks. I'll keep looking for someone to test it :)
 
0celouvskyopoulo7
0celouvskyopoulo7
1:54 AM
@ACuriousMind Am I right to think that when defining Spin, Pin, whatever abstractly, they should get the subspace topology from $\Bbb R^{2^n}$?
 
Physics Meta
Physics Meta
0
Q: This site is not a scientific writting forum/publication support service?

LuzanneI came across this question: The proper use of the terminology of forces and interactions in The Theory of Relativity which I have a feeling should be off-topic, but I cannot really localize a specific help center guideline or meta answer that would pinpoint why, so I refrained from flagging it...

discussion close-reasons
 
 
4 hours later…
user228700
5:43 AM
@JohnR: Morning :-)
 
John Rennie
John Rennie
5:54 AM
@Kaumudi.H Morning :-)
Sorry for the slow response. I was looking at Bernardo's code and I can't make head nor tail of it!
I think Ill give up for now.
 
Slereah
Slereah
@0celouvskyopoulo7 can't access
 
user228700
@JohnRennie Ah :-( OK...
 
user228700
I'mma watch the first movie now; didn't get the cable but I'll watch it on my laptop anyway!
 
user228700
(Woke up about an hour ago; slept for close to 10 hours :-o)
 
John Rennie
John Rennie
Re those videos: I reduced the quality a lot to get the file size down. They looked OK when I previewed them, but you may notice some blurring in fast moving scenes.
 
user228700
6:04 AM
Eh, that's OK :-) I'm immensely grateful that at least I have them!
 
John Rennie
John Rennie
If you find the quality is too low there is probably some scope for improving it. I didn't realise your Internet was so fast, so you could probably manage bigger files.
 
user228700
No, no, this'll do :-)
 
John Rennie
John Rennie
@Kaumudi.H Well, let me know if when you've watched the first film you think the quality is too low. It's remarkable how effective the compression is - it has squeezed three and a bit hours of film into only just over a GB!
 
user228700
Wow, yeah, that is impressive! :-o
 
user228700
@JohnR: It's time for me to reconnect with old friends and I'm dreading it.
 
user228700
6:10 AM
I re-installed WhatsApp last night but promptly deleted it once again in 4 minutes.
 
yuggib
yuggib
@0celouvskyopoulo7 surely they introduced surjective and injective
 
John Rennie
John Rennie
@Kaumudi.H Just take it a step at a time. The worst that can happen is if your interests have diverged to the point where you no longer have much in common, and that won't be the end of the world.
When do you know for sure which college you're in and what course you're doing?
 
user228700
No, I already know that our interests are different but yes, if I make myself available on WhatsApp, I will be quickly attacked from all sorts of people to ask about everything; the drop year, the results, etc.
 
John Rennie
John Rennie
That's why I'm wondering if it's worth waiting till you have confirmation from the college.
 
user228700
My thoughts exactly.
 
John Rennie
John Rennie
6:13 AM
How long is it likely to be?
 
user228700
...think I'll re-install it once everything has calmed down and I have officially been accepted into a college.
 
user228700
@JohnRennie A month and a half...
 
John Rennie
John Rennie
Wow, that's a long wait.
 
user228700
Yeah :-/
 
John Rennie
John Rennie
You could get started on CS by trying to work out what the hell Bernardo is doing in his disfunctional code :-)
 
user228700
6:15 AM
@JohnRennie Hehe, which language?
 
John Rennie
John Rennie
That should keep you busy for a few weeks decades :-)
@Kaumudi.H C
 
user228700
Is C a lot different from C++?
 
Slereah
Slereah
Fairly similar except for objects
 
user228700
How so?
 
Slereah
Slereah
C++ is just a layer on top of C to add objects
Or at least it was originally
 
user228700
6:20 AM
Uhh, that doesn't help me very much...
 
John Rennie
John Rennie
I think C is a subset of C++ i.e. code that is legal in C is legal in C++ though I wouldn't swear to this.
Basically C doesn't have classes, and there are a few minor features C doesn't have.
 
user228700
@JohnRennie It doesn't have classes?! Oh, wow, OK...
 
John Rennie
John Rennie
@Kaumudi.H Yes, that's the main difference. You can use structs to kind of do the same thing as classes but it's far more limited.
 
user228700
I'm aware of those limitations to a certain extent...
 
John Rennie
John Rennie
No-one uses C these days, except possibly in niche cases like programming embedded systems, so why Bernardo is being given projects to do in C escapes me. Oh well.
 
user228700
6:24 AM
:-/ Hmm...
 
John Rennie
John Rennie
I suppose it helps develop discipline, because in C unless you're fanatically disciplined your code is likely to blow up in your face.
Bernardo's code is blowing up in his face :-)
 
Slereah
Slereah
@JohnRennie I use C :(
 
user228700
:-( Well...
 
Slereah
Slereah
You don't need classes for a lot of applications
especially for numerical simulations
 
John Rennie
John Rennie
@Slereah Why? I mean, why? There's no overhead to using C++ so why on earth use C?
 
Slereah
Slereah
6:26 AM
why not
There's no particular reason to use C++ either
 
user228700
@JohnR:
 
user228700
 
Slereah
Slereah
If you're not using classes there's almost no reason to use C++ over C
 
John Rennie
John Rennie
Convenience. Even if it's as simple as using // for comments.
 
Slereah
Slereah
Most compilers accept // comments in C
 
John Rennie
John Rennie
6:27 AM
@Kaumudi.H 42°C!!!!
 
user228700
YES!!
 
Slereah
Slereah
C++ doesn't have garbage collection, dynamic strings or most other features of a modern language
All it has over C is classes and exception handling
 
John Rennie
John Rennie
I need to work for about half an hour. Back later ...
 
user228700
And I'm finally off to watch that movie. Toodles!
 
user228700
6:43 AM
BTW, @JohnR: I don't need the cable or anything! I can simply copy the films onto my pendrive and connect that to my T.V! :-)
 
John Rennie
John Rennie
@Kaumudi.H Perfect :-)
 
Swapnil Das
Swapnil Das
7:00 AM
Hello.
I need some help with understanding the dA of the differential element of a Hemisphere.
Here, we try to find out the electric field at the center of a hollow hemisphere.
We can consider the hemisphere as a combination of charged rings of Thickness Rd@ and radius Rcos@.
The only problem I face is to find out the the area dA of that ring element rigorously.
The only way I get is to do that intuitively, open up that ring into a rectangle with circumference as length and width as breadth.
If A = pi ( r^2 cos^@)
 
John Rennie
John Rennie
@SwapnilDas That's the correct way to do it. What problems are you running into with that approach?
 
Swapnil Das
Swapnil Das
But isn't that kind of intuitive and bit sloppy?
I thought dA/d@ could be a better approach.
 
John Rennie
John Rennie
No, not at all. It is an approximation for any finite value of $d\theta$, but as we let $d\theta \rightarrow 0$ the approximation becomes exact.
This approach is widely used when integrating up areas, volumes etc.
You'll encounter it all over the place when doing problems in electrostatics.
 
Swapnil Das
Swapnil Das
Ah, Ic.
Thanks a ton! @JohnRennie
 
Mickey Jack
Mickey Jack
7:30 AM
how to create a programming language for PPCG
any one can answer
 
John Rennie
John Rennie
7:48 AM
PPCG?
 
user228700
8:07 AM
@JohnRennie Ugh, do u remember January when I'd been doing the same? Oof.
 
John Rennie
John Rennie
@Kaumudi.H Oh yes, I remember that all too clearly :-)
On the bright side it's one more thing YOU'LL NEVER HAVE TO DO AGAIN!!! :-)
Aren't you supposed to be watching The Fellowship of the Ring?
 
user228700
@JohnRennie :-D The movie is good! 2 more hours to go though...
 
John Rennie
John Rennie
@Kaumudi.H It's a looooooooooong film.
 
user228700
@JohnRennie Yeah, I'm taking a small break :-P Would u believe it that it's 42 deg C here and there is no current!
 
John Rennie
John Rennie
In fact all three of the films are over three hours.
No current? You mean no wind?
 
user228700
8:10 AM
I know, yeah. Although, it looks like it's going to be worth it! I'm liking this Frodo Baggins person <3 I've also read The Hobbit (and watched all three of those films, more or less) so it's a little easier to get into the flow of things...
 
user228700
@JohnRennie No, no power.
 
John Rennie
John Rennie
Frodo is wet. He spends most of the second and third films looking anguished and pathetic!
 
user228700
Oh, erm :-(
 
John Rennie
John Rennie
@Kaumudi.H Ah, hence the break from watching the film?
 
user228700
He looks cheery and wonderful in this one...
 
user228700
8:12 AM
@JohnRennie No, no, I think the battery on my laptop will last me for another 2 hours. Well, I hope. I was just getting tired of concentrating so much; no subtitles so that makes it just a smidge harder...
 
John Rennie
John Rennie
Ah, you decided not to watch on the TV - kind of an easy decision really if there's a power cut :-)
@Kaumudi.H I keep forgetting English isn't your first language because your English is so good.
 
user228700
Hehe, that's a compliment, thanks! :-) It's sometimes a bit difficult to understand exactly what they're saying. Especially Gandalf.
 
user228700
I can't remember the last time his whole face was looming right in front of the camera (with him muttering something crucial to the plot) when talking.
 
user228700
Wonderful! I've just accidentally downloaded some sort of malware hiding in what I thought was subtitles for this movie.
 
user228700
AVG is working its magic though so it's all good!
 
John Rennie
John Rennie
8:36 AM
You need to be cautious. AVG is good, but not infallible. Viruses vary so rapidly that any anti-virus program struggles to keep up. If you're not 100% sure what you're downloading is safe then you're better off not downloading it.
 
user228700
9:15 AM
@JohnRennie Right, right.
 
user228700
Gosh, I am veritably melting away...
 
John Rennie
John Rennie
15°C here in Chester
 
user228700
If I don't return again today, please believe that I melted into a pool and died.
 
Balarka Sen
Balarka Sen
i feel ya
 
John Rennie
John Rennie
Liquifactiamus!
 
user228700
9:18 AM
@JohnRennie That's too cold!
 
John Rennie
John Rennie
Do the extreme temperatures last a while, or just for a day or two?
 
user228700
@JohnRennie For a long while, you can bet.
 
user228700
At least until the end of June for sure...
 
Balarka Sen
Balarka Sen
Gandalf is acted by Ian Mckellen, isn't it? What a guy
 
ArtOfCode
ArtOfCode
@JohnRennie we might even make it to 20 down here on the south coast if we're lucky
 
John Rennie
John Rennie
9:19 AM
Actually I like the temperature in the range 15-20°C. You do need a pullover if you're sitting still, but if you're doing anything energetic it's just the right temperature to cool you.
 
user228700
I keep thinking it's the same guy who plays Dumbledore in parts 3 through 7 but nope.
 
Balarka Sen
Balarka Sen
haha me too
But that was an Irish fellow IIRC
 
John Rennie
John Rennie
@ArtOfCode I'm from down south originally - Somerset.
 
Balarka Sen
Balarka Sen
He was good too. I liked him a lot.
 
user228700
Yes, me too.
 
John Rennie
John Rennie
9:20 AM
Richard Harris?
 
user228700
No, no, he passed away after the second one.
 
John Rennie
John Rennie
Ah, Michael Gambon.
 
user228700
Ah, this Ian Mckellen person played Magneto as well.
 
John Rennie
John Rennie
@BernardoMeurer: you around? I see your icon lurking there ...
 
Balarka Sen
Balarka Sen
he was really into x-men yeah
at least before michael fassbender
 
user228700
9:22 AM
@BalarkaSen No current in my house.
 
John Rennie
John Rennie
Is the power outage related to the heat?
 
Balarka Sen
Balarka Sen
he's an accomplished actor in Shakespearean theaters, other than his commercial accomplishments, too
 
user228700
I don't think so. Oh God, at least I hope not.
 
mathvc_
mathvc_
does anyone know a good paper on the proof of Lovelock's theorem in GR?
hey guys!
 
Balarka Sen
Balarka Sen
@Kaumudi.H erk
 
John Rennie
John Rennie
9:24 AM
When I was working in Bangkok we'd get power cuts whenever it rained - which was a lot!
 
user228700
...my keyboard is starting to get wet from sweat.
 
John Rennie
John Rennie
Ugh! :-)
 
user228700
So's the base oh God...
 
John Rennie
John Rennie
Thanks for sharing that :-)
 
user228700
@JohnRennie Most welcome :-P
 
John Rennie
John Rennie
9:25 AM
I doubt Dell made their laptops to be resistant to bodily fluids.
 
user228700
Eh, it's just salt water.
 
John Rennie
John Rennie
So it's a good conductor then? Ideal for laptops :-)
 
user228700
Uhhhh...
 
user228700
 
user228700
Hahaha
 
user228700
9:26 AM
(Source: tumblr)
 
John Rennie
John Rennie
Have you ever read Harry Potter and the Methods of Rationality?
 
user228700
Clearly not...
 
John Rennie
John Rennie
Why clearly? Anyhow, in that HP and Malfoy are friends and Snape is a good guy who supports harry.
 
user228700
> Harry grows up fascinated by science and science fiction. When he finds out that he is a wizard, he tries to apply scientific principles to his study of magic, with sometimes surprising results.
 
user228700
Oh wow.
 
John Rennie
John Rennie
9:29 AM
Even though it's fan fiction it's well written. Though it goes on, and on, and on ...
 
Mithrandir24601
Mithrandir24601
@Kaumudi.H This sounds promising...
 
user228700
@JohnRennie Because I would've brought it up a lot earlier if I had!
 
Balarka Sen
Balarka Sen
over the course of years i found harry potter less interesting and more annoying
 
user228700
@JohnRennie I wish The Cursed Child was fan written. Sadly, it's not :-(
 
John Rennie
John Rennie
@BalarkaSen you're growing up! Stop it immediately!
 
Balarka Sen
Balarka Sen
9:30 AM
i still like a lot of kid stuff. (LOTR is one of the best fantasy books I have read)
 
user228700
I haven't re-read the books ever so I'm over here still pretty happy with the movies (I've forgotten everything from the books)
 
John Rennie
John Rennie
I read the LOTR books and I even read The Silmarrilion. But I feel no great urge to repeat the experience. It's the sort of thing you do just to prove you can.
 
Balarka Sen
Balarka Sen
Nah i don't want to read it again either
 
Mithrandir24601
Mithrandir24601
@JohnRennie Ever tried Wheel of Time? It's an absolute marathon
 
user228700
@JohnRennie I feel similar to you on this one. They're far too huge and my willpower is, erm, limited.
 
John Rennie
John Rennie
9:32 AM
@Mithrandir24601 Robert Jordan?
 
user228700
...which is why I'm watching the movies instead.
 
Balarka Sen
Balarka Sen
i never watched all of the movies
they'r just not super good
 
user228700
 
Mithrandir24601
Mithrandir24601
Yep, except for the last 3 books, which are Brandon Sanderson, and easily the best in the series
 
user228700
Haha, nice!
 
John Rennie
John Rennie
9:33 AM
I'll see your Robert Jordan and raise you Steven Erikson's Malazan books :-)
 
Mithrandir24601
Mithrandir24601
Currently reading them :) On part 4 of book 3 - they're much, much better :D
 
Balarka Sen
Balarka Sen
he and patrick stewart put up a stage performance of Waiting for Godot
 
user228700
@BalarkaSen I couldn't possibly comment 'cause I never did read the books.
 
Balarka Sen
Balarka Sen
i hear it's very acclaimed
 
user228700
I mean, I tried once in 7th or something but gave up.
 
user228700
9:34 AM
...all too quickly.
 
John Rennie
John Rennie
@Mithrandir24601 Adrian Tchaikovsky - Shadows of the Apt? I think there's about ten books in that series.
 
Balarka Sen
Balarka Sen
you won't miss out on anything huge if you don't read it
 
user228700
...and Kaumudi continues to melt.
 
user228700
@BalarkaSen That's a relief.
 
Bernardo Meurer
Bernardo Meurer
@JohnRennie Now I am :)
Good morning
 
John Rennie
John Rennie
9:35 AM
Morning.
I got your code to compile by rewriting asprintf and the current version seems to work fine.
 
Kenshin
Kenshin
Hello People
 
Mithrandir24601
Mithrandir24601
@JohnRennie Heard of, seen and will read at some point, but I've got quite a few books to go before that point...
 
Balarka Sen
Balarka Sen
h
 
Mithrandir24601
Mithrandir24601
@Kenshin Rytsas
 
user228700
Hey, @Kenshin! :-)
 
Kenshin
Kenshin
9:37 AM
@JohnRennie are you a gambling man?
 
John Rennie
John Rennie
@BernardoMeurer But you have a bug where you call asprintf. You either need to cast time_t to a long or use %llu in the format string.
 
Kenshin
Kenshin
Hi @Kaumudi.H!!!!
 
Bernardo Meurer
Bernardo Meurer
@JohnRennie Sweet! If I remembered to push that means the current version does head insertions as opposed to tail
 
user228700
@Kenshin Wadup?
 
Kenshin
Kenshin
@Mithrandir24601 what is rytsas
@Kaumudi.H stuff u
 
user228700
9:38 AM
x'D Same here(?)
 
John Rennie
John Rennie
@BernardoMeurer no, the code i have does trip_n_tailInsert and station_n_tailInsert
 
Kenshin
Kenshin
awesome
 
Mithrandir24601
Mithrandir24601
@Kenshin High Valyrian greeting, that is, I think, essentially wishing you 'good health', or something to that effect
 
Kenshin
Kenshin
@Kaumudi.H when do you find out if you can go to uni?
 
Bernardo Meurer
Bernardo Meurer
@JohnRennie Where do I print time_t?
Really? And it works?
 
John Rennie
John Rennie
9:39 AM
@BernardoMeurer types.c:
//JR    asprintf(&str, "[ID:%u, DUR:%lu, SDT:%s, SID:%u, FDT:%s, FID:%u, BID:%s, REG:%s, DOB:%u, SEX:%s]",
//JR             self->ID, self->duration, sdt, self->start_ID, fdt, self->finish_ID,
//JR             self->bike_ID.toString(&self->bike_ID), self->user->regToString(self->user), self->user->dob,
//JR             self->user->sexToString(self->user));
 
Kenshin
Kenshin
@Mithrandir24601 what is valyrian
 
user228700
@Kenshin Dude, I'm definitely going.
 
user228700
Just dunno where yet...
 
Kenshin
Kenshin
congratulations!
oh
 
user228700
I have an idea but I'm not sure yet.
 
John Rennie
John Rennie
9:40 AM
@BernardoMeurer: self->duration is type time_t
 
Kenshin
Kenshin
is uni prestige a big thing in India?
 
user228700
@Kenshin You bet.
 
Kenshin
Kenshin
that's a shame
 
Balarka Sen
Balarka Sen
too much a thing
 
Mithrandir24601
Mithrandir24601
@Kenshin The language of a Song of Ice and Fire - David Peterson created it for the TV show
 
Bernardo Meurer
Bernardo Meurer
9:40 AM
@JohnRennie Fixed, using %llu now
 
Balarka Sen
Balarka Sen
it should be burninated
 
Bernardo Meurer
Bernardo Meurer
Hmm
My compiler complains
 
Kenshin
Kenshin
here in Australia noone cares where you go to uni
 
Bernardo Meurer
Bernardo Meurer
Says %lu is correct
 
Kenshin
Kenshin
but I hear in the USA people also care alot about prestige
 
Balarka Sen
Balarka Sen
9:41 AM
ah yeah Australia is really good i hear.
 
Bernardo Meurer
Bernardo Meurer
@JohnRennie Ah, it's not portable, lol
 
John Rennie
John Rennie
I used:
sprintf(str, "[ID:%u, DUR:%lu, SDT:%s, SID:%u, FDT:%s, FID:%u, BID:%s, REG:%s, DOB:%u, SEX:%s]",
self->ID, (long)self->duration, sdt, self->start_ID, fdt, self->finish_ID,
self->bike_ID.toString(&self->bike_ID), self->user->regToString(self->user), self->user->dob,
self->user->sexToString(self->user));
 
Bernardo Meurer
Bernardo Meurer
time_t has different types
 
Kenshin
Kenshin
yea if you go to a bad uni in India, just move to Australia and you'll be right mate
 
Bernardo Meurer
Bernardo Meurer
for POSIX and Windows
 
John Rennie
John Rennie
9:42 AM
Use (long)self->duration then ...
 
Bernardo Meurer
Bernardo Meurer
@JohnRennie Yep, i'll turn it into an unsigned long
 
Balarka Sen
Balarka Sen
@ACuriousMind Nice face
 
Kenshin
Kenshin
@BalarkaSen r u a gambler?
 
Bernardo Meurer
Bernardo Meurer
@JohnRennie Change your insertions to head and see what happens
I pushed a new version, but IIRC all the changes are minimal
 
Balarka Sen
Balarka Sen
@Kenshin not yet
 
Kenshin
Kenshin
9:45 AM
awk
 
user228700
QQ: Are u s'posed to understand all this elvish gibberish or is it OK that I don't have subtitles?
 
Balarka Sen
Balarka Sen
@kenshin we're all gambling with our lives tho
2
 
John Rennie
John Rennie
@Kaumudi.H in the film?
 
Kenshin
Kenshin
yeah I agree
 
user228700
@JohnRennie Yes?
 
Kenshin
Kenshin
9:47 AM
that is why one must master gambling if one wants to master life
 
Balarka Sen
Balarka Sen
read The Gambler, also by Dostoyevskij
also one of my favorite short story
 
Kenshin
Kenshin
@BalarkaSen suppose I am a casino and have a fiar coin and I give you $1 if heads and you give me $1 if tails, will you play?
 
John Rennie
John Rennie
@Kaumudi.H I can't remember the film - I last saw it 15 years ago.
 
user228700
Dang. @Balarka: Help?
 
Balarka Sen
Balarka Sen
@Kenshin yeah why not.
 
Kenshin
Kenshin
9:49 AM
@BalarkaSen because it isn't favourable
a fair bet isn't favourable long term
because
 
Balarka Sen
Balarka Sen
i mean it's favourable to neither of us
 
Kenshin
Kenshin
variance means you will face ruin eventually
 
Balarka Sen
Balarka Sen
so let's gain or die trying
 
ACuriousMind
ACuriousMind
@BalarkaSen thx
 
Kenshin
Kenshin
so you should only take bets that are favourable
 
Balarka Sen
Balarka Sen
9:49 AM
@Kaumudi Hmm, no idea
 
Kenshin
Kenshin
even bets give you varience without reward
 
ACuriousMind
ACuriousMind
@JohnRennie LotR is 15 years old? Now I feel old.
 
Balarka Sen
Balarka Sen
You're probably not supposed to understand the gibberish
 
user228700
@BalarkaSen OK. I hope...
 
Kenshin
Kenshin
@Kaumudi.H you should look it up in an online elvish dictionary it is crucial to th story
 
Balarka Sen
Balarka Sen
9:50 AM
yeah look in the back of LOTR
 
user228700
I don't trust you... (:-P)
 
Kenshin
Kenshin
lol good
 
Balarka Sen
Balarka Sen
Tolkien wrote an elvish dictionary for sure
is this elvish of the rivendell? or high elves?
 
John Rennie
John Rennie
@ACuriousMind I'm sure it was 2002 or 3. Hang on, a quick Google is in order ...
2001! 16 years ago.
 
yuggib
yuggib
@ACuriousMind so you converted to tyranny I see
 
ACuriousMind
ACuriousMind
9:55 AM
I did
That game was actually good, not like Torment 2 :P
 
yuggib
yuggib
Yeah, I also tried Torment 2 and..I cannot say I liked it
 
Sha Vuklia
Sha Vuklia
Guys, if we consider a current, can we then always say that the current is constant along the "flow"? If we look at the wire depicted above, the current could have different values along the cross section, however, along the "flow" of the charges, the current is constant, right? Otherwise it seems to me we would have charges disappearing/appearing. (Also, is there a more formal notion of flow? Or should I just stick with "the direction the charges are going")
 
Bernardo Meurer
Bernardo Meurer
@JohnRennie Any luck?
 
yuggib
yuggib
Tyranny is nice! I went for a monk type character
huge number of attacks per round
 
Kenshin
Kenshin
@ShaVuklia current should be the same
along the "flow"
if current decreased over the distance youwould have a "sink" where charge accumulates
 
Sha Vuklia
Sha Vuklia
9:59 AM
right
 
Kenshin
Kenshin
if current increased, you musth ave a "source" of charge
 
Sha Vuklia
Sha Vuklia
do we define flow as the direction of a steady sub-current in the wire?
 
user228700
@BalarkaSen High elves? I've no idea what they are...
 
user228700
But yes, this is Rivendell.
 
Kenshin
Kenshin
I dunno i've never defined flow b4
 
ACuriousMind
ACuriousMind
10:00 AM
@yuggib My main issue with Tyranny is that it ends right when you really want it to go on, but it's sort-of dramatically appropriate so I can't even be mad.
 
John Rennie
John Rennie
@Kaumudi.H were you after Hindi subtitles?
 
user228700
@JohnRennie Gosh no!
 
user228700
English, of course!
 
John Rennie
John Rennie
English subtitles?
 
Sha Vuklia
Sha Vuklia
@Kenshin yea well, Griffiths doesn't define it either. I think they just use it to say something about infinitesimal widths/areas, where we consider the current "along the flow"
 
John Rennie
John Rennie
10:01 AM
@Kaumudi.H OK, in that case I think I've found you subtitles
 
yuggib
yuggib
@ACuriousMind I have to confess that I switched back to bg at 75% of tyranny, so I don't know yet the end :D
 
user228700
AHH, really?! How did u manage? I tried before but didn't trust myself to know the difference b/w malware and harmless files...
 
ACuriousMind
ACuriousMind
Haha, alrighty then
 
Kenshin
Kenshin
ethics is just about avoiding malware
 
Sha Vuklia
Sha Vuklia
oh wow, I didn't recognise you @ACurious
 
ACuriousMind
ACuriousMind
10:03 AM
I...tend to change my appearance every once in a while ;)
 
Sha Vuklia
Sha Vuklia
:P
 
John Rennie
John Rennie
@Kaumudi.H: OK, have a look on the web site now.
 
Kenshin
Kenshin
do u play chess @JohnRennie
2
 
John Rennie
John Rennie
@Kenshin No
 
Kenshin
Kenshin
y not
 
user228700
10:07 AM
AHHH, it works!! :-D
 
user228700
THANKS SO MUCH!
 
John Rennie
John Rennie
@Kenshin it seems a pointless exercise
2
 
user228700
Dang it, I feel incredibly guilty for troubling you like this. No more! You are far too generous.
 
Kenshin
Kenshin
just like life @JohnRennie?
I don't play chess either, but I was just wondering if you did
 
John Rennie
John Rennie
@Kenshin the reasons people find life gratifying are many and various, and generally not amenable to logical analysis. In my case chess doesn't contribute to the quality of my life.
 
Kenshin
Kenshin
10:09 AM
same here, it's pretty boring to me
 
user228700
Damn, now I feel like watching it from the start again but nope. Must forge on...
 
Kenshin
Kenshin
just watch it again
ur on holidays now
 
user228700
No, no, apart from the occasional remark or two, I think I've understood most everything till now.
 
Kenshin
Kenshin
what is it that ur watching
game of thrones?
 
user228700
No. Fellowship of The Ring.
 
Kenshin
Kenshin
10:13 AM
oh cool
I recommend the hobbit series
 
user228700
@Kenshin I've read the book and watched all the movies as well :-)
 
Kenshin
Kenshin
that's good then :)
 
user228700
There have been none of them weird lion-riding creatures till now and I hope there won't. They're creepy.
 
user228700
Ahh...
 
user228700
They're called orcs and eh, they were those same things in The Hobbit as well. They just look a lot different...
 
user228700
10:16 AM
This opposed to this
 
user228700
The second one's not too bad; it's easy not to imagine them complexly. The first are far too human-like.
 
Sha Vuklia
Sha Vuklia
Guys, why do we have a normal derivative with respect to time when the differential operator is outside the integral, and when it’s inside the integral, we get a partial derivative? I would think then that $\int_V\rho\,d\tau$ is given entirely in terms of $t$… but that doesn’t make sense to me, tbh.
this is the definition of $J$ btw
 
ACuriousMind
ACuriousMind
10:33 AM
@ShaVuklia The distinction between "total" and "partial" derivatives is not always kept stringently, but in this case it's because e.g. the integration region $\mathcal{V}$ could also depend on $t$.
 
Sha Vuklia
Sha Vuklia
Hm, maybe it does make sense. $\rho$ could depend on all kinds of things, like position and time. However, the entire $\int_V\rho\,d\tau$ just gives us how much charge is present on a specific time, so we can take the time derivative, I guess. I'm still not entirely sure
@ACurious yea, is what I just wrote after you correct then?
 
ACuriousMind
ACuriousMind
Additionally, the whole integral is just a function of $t$ (if you keep the region fixed), while $\rho$ is a function of both position and time.
@ShaVuklia Yes, that
 
Sha Vuklia
Sha Vuklia
right, thanks
studying EM hurts, and tomorrow I'm starting with QM. I think it can only get worse from there on
 
ACuriousMind
ACuriousMind
But in general I would advise not to think too hard about the difference between the total and partial derivatives unless it's relevant for a derivation because many texts are really bad at explaining what they mean by total/partial.
 
Sha Vuklia
Sha Vuklia
Yea, sure, but I try to at least make it plausible for myself, which is usually a good exercise in thinking about the dimensions/variables/etc.
 
Kenshin
Kenshin
10:42 AM
I don't like the orcs they're annoying @Kaumudi.H I like Smaug best
 
user228700
> orcs are annoying
 
user228700
Yeah, no kidding x'D
 
Slereah
Slereah
Do Killing vector fields always define a one parameter isometry
ah yes, it is
 
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