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2:00 PM
@Slereah Note the interesting point about fibrewise homeomorphy. It may well be that, purely topologically, $TL = L\times\mathbb{R}$, just not by a homeomorphism that respects the bundle structure.
So asking for the "shape" may be misguided - the non-triviality here is an effect of the weird notion of "continuity" on the long line, not of some non-trivial "shape" of it.
 
2:13 PM
what are we talking about
 
Yeah, that's what I thought
The long line just has weird notions of what continuity is
Every section of the bundle is probably $I \times \Bbb R$ and they probaby overlap trivially
But
Too longly
I probaby shouldn't use "section" here
Trivialization
My motto
 
@PhysicsGuy ....
Why are atheists so edgy
You're not trolling anyone if that's your goal
 
@0celouvskyopoulo7 Not all of us are :P
 
2:29 PM
@ACuriousMind You're a computer
Christ does not love you anyway
 
You can fake human emotions all you want
We will not be fooled
 
atheism is good.
 
I love that "posting an emoticon" passes as "faking human emotion" :P
 
@0celouvskyopoulo7 is from the younger 4chan generation, he trolls by pretending to be a christian conservative
 
@Slereah I am like Lumo, a Catholic Atheist
 
go to alt.atheism
 
@ACuriousMind For real though, r/atheism is cancer
 
Let's say I know why I generally don't hang out much on reddit :P
 
Actually the biggest cancer is r/LateStageCapitalism
Followed by r/TwoXChromosomes
 
2:34 PM
tips fedora
 
That's Latest Age
 
r/politics
r/BernieSandersForPresident
Lately r/TheDonald is cancer too
Used to be pretty good
 
You don't really need to give us your carefully curated list of subreddits you dislike ;P
 
@ACuriousMind Ok.
r/NatureIsMetal is pretty awesome
r/BlackPeopleTwitter
 
you're on the deep end of reddit man
don't go there
 
2:38 PM
I used to frequent r/SpaceDicks
 
you'll go cook-oo on the head
 
I was fairly edgy back in high school
r/NatureIsMetal is pretty edgy, but also educational
I watched a video of a python eating a deer yesterday
Took FOREVER
 
@0celouvskyopoulo7 Confirmed
 
@ACuriousMind Wot
 
wot wot
 
2:39 PM
in the bot
@ACuriousMind Aww, I was talking to Chris :(
 
you might be edgy but are you avant garde?
that's what i strive for
 
I see no reason for that
It wouldn't be hard
Just listen to Death Grips, Bowie, stop shaving, stop cutting hair/nails
Wear strange shoes
Talk with a made up accent
 
All accents are made up
 
oh not this again
 
@0celo That's just standard counterculture from the 60's which has turned into mass culture now. According to Greenberg's definition in "Avant-garde and Kitsch", a true 21st century avant-gardian would also have to refute that lifestyle and appearance.
Because avant garde is rejection of mainstream culture and ideas, not simply being weird.
#deepphilosophybro
 
2:53 PM
So how do you be avant garde in a culture where being avant garde is mainstream?
Or is that the challenge?
 
that is indeed a good summary of the challenge
 
0
Q: How to write the Feynman slash notion in latex and Microsoft word?

Danny NelsonDoes anybody know How to write the Feynman slash notion in latex and Microsof word? by Feynman slash nation I mean where you have an inclined short line on symbols.

hahahahaahhaha
word?
 
@BalarkaSen Are you truly defining "avant garde" purely in opposition to existing culture? Because then it would seem being avant garde is just rejecting the mainstream for the sake of rejecting it.
 
The way to the future is aluminium jumpsuits
 
Is ISIS avant garde?
 
2:58 PM
@ACuriousMind sad
 
It's fairly retro
 
=P
Having said which, I do think the question of how to write Feynman slashes in MS Word is interesting enough.
 
@EmilioPisanty ...
what the hell
I posted that above
 
I think the best way is to switch to TeX
 
Does no one fucking read what I write?
 
2:59 PM
@0celouvskyopoulo7 hah
no
 
Am I even alive?
 
I just popped in and didn't read any of the above
plus it's deleted now
 
Indeed
But it's a good question
 
good job preserving it in a onebox
 
Although who needs to write such a thing in Word
 
3:01 PM
yeah, that's the thing
you probably can't do it
 
It's like asking how to do commutative diagrams in word
if you know what a commutative diagram is, you're not using word
 
yeah, pretty much
 
@ACuriousMind I am not defining much :) avant-garde throughout history has been motivated in part by opposition to classical, mass ideas and beliefs, not just for the sake of new artistic and cultural ideas (hence the kitsch!).
 
Theorem: You can always write all the Feynman slashes you need to in MS Word
 
@EmilioPisanty I'm slacking, I know :P
 
3:02 PM
Proof: by vacuity
 
1
Q: What is the best way to write Feynman slash notation in MS word?

AnonymousWriting slashes appear displaced usually in word. What is the best way and most visually appealing to write a slash and how to adjust the position of the slash. https://en.wikipedia.org/wiki/Feynman_slash_notation symbol combined with unicode 0338 gives something unpredictable Ctrl F9 and inse...

 
What are people's thoughts on the new name
 
I like it.
 
@JohnRennie oh god
that's horrifying
 
Oh boy
My book on the Kerr metric has arrived!
 
3:03 PM
@BalarkaSen good!
@Slereah the one by o'neill?
 
Nah
 
@EmilioPisanty more horrifying than LaTeX?
 
the one by several people
 
@JohnRennie way more horrifying
infinitely more horrifying
 
dividing by zero and all that
 
@0celouvskyopoulo7 I don't like it not fully displaying on my screen :P
 
@JohnRennie I mean, compare to the syntactic cleanliness of the TeX way
\documentclass[12pt]{article}
\usepackage{amsmath}
\usepackage{slashed}
\begin{document}
$\slashed{p}$
\end{document}
 
does exactly what it says on the tin
 
3:06 PM
honestly if you have to write a slash unironically you're doing something wrong
 
@0celouvskyopoulo7 I still vote for 0celóñez
though I guess 0celouvskyopoulóñez is also an option
 
@0celouvskyopoulo7 ^Hm.
 
@ACuriousMind I see the same
but it depends on the window size
 
Yes, it shows the full name on my main monitor but not on my second monitor which has a slightly lower resolution
 
hmm
So I should make it O'0celøñez?
 
3:14 PM
Oserotu, for a japanese touch
 
lol
Al-O'0ßëløñéz-sän
 
ben O'0celøñez-san
 
@JohnRennie
 
you are mutilating your name beyond recognition
 
I don't think the "-san" is part of the name, it's a honoriffic.
 
3:15 PM
@ACuriousMind Yeah, so?
 
@0celouvskyopoulo7 old 0celo7 was good.
 
You are Wrong.
 
@0celouvskyopoulo7 Not everyone would address you as "-san" depending on their relation to you, so using that as a name would appear presumptuous to an actual Japanese speaker, I think.
 
@ACuriousMind Oh because I'm so concerned with accuracy here.
 
0celo 7se 7ung
 
3:17 PM
@0celouvskyopoulo7 Well, but so far you have only used parts that occur in actual names. I feel as if this would break/expand the pattern.
 
no offense to the chairman
 
@Maxwell Hi
 
How did this even start?
 
Do you think the japanese use the -san ironically, like how a westerner would call someone drunk professor
 
I just posted an answer with the only purpose of using -+++ instead of +---
 
3:19 PM
@Slereah that's an interesting question, I have no idea
 
@AccidentalFourierTransform what?
 
yesterday, by AccidentalFourierTransform
I decided that -+++ is not that bad and I might change into that convention from now on
 
Calling someone "professor" is when they are at the stage between drunk and passed out, when they are about on the same level as a special need child
 
Though I'm trying to remember if I've ever called a drunk professor
 
3:20 PM
why the sudden conversion?
 
Maybe I can't because I'm usually the drunk.
 
$-+++$ is the True Way
 
@ACuriousMind You poor child
 
One day I should learn the newman penrose formalism
Just so I can make the worst possible answer to someone
Just a giant wall of math
 
@AccidentalFourierTransform did you get hacked?
I think you got hacked
 
3:22 PM
1234 was not a very good password, was it
 
@AccidentalFourierTransform should've used eight asterisks as JR does
 
@AccidentalFourierTransform No, your next one should be 4321, no one expects that.
 
mine is eight bullet points for better stealth
 
Just look at this madness
 
3:23 PM
That's not a good password.
2
 
My password is 1234
 
@ACuriousMind no, it's not. But only because it's unaligned.
 
To be fair, a password that is 123456... has the same entropy as any password of the same length
but of course it's easier to crack by less direct means
 
Unfortunately, humans guessing passwords care little about entropy :P
 
Yeah
 
3:25 PM
entropy is not a good measure of entropy
 
How does password cracking work anyway
 
@Slereah To be fair, that is precisely the reason why entropy is not that good of a metric for password strength.
 
Sometimes when I'm on a machine I don't know, I'll try the usual passwords just in case
 
you get locked out after 4 failed attempts
 
no password, "password", "admin" and 123456
also azerty
 
3:26 PM
@0celouvskyopoulo7 Like this
 
azerty?
 
@0celouvskyopoulo7 depends on the machine
 
"azerty" found the french
 
azerty is the french version of qwerty
 
the french are the worst
can't even use regular keyboards
 
3:26 PM
And I'm sitting here looking at qwertz
 
@0celo just ask someone what their password is
 
A good method to crack passwords if you don't care about who you're hacking is
 
works always ever
 
@ACuriousMind germans are the worst too
 
1) take a list of common passwords
 
3:26 PM
@0celouvskyopoulo7 dunno, man, German keyboards are also horrifying
 
2) try all passwords for every member of a website
 
@EmilioPisanty Germans and French are tied for the worst
 
The most common passwords will usually cover about 5% of the people
 
We have some German computers in my office
it's terrible
the shift key is too small
 
So for a big site you can haxx a fair number of people
 
3:27 PM
@Slereah pretty good idea actually
 
@0celouvskyopoulo7 I think the French edge the Germans out by a bit on that one, to be honest
 
you always hit / and look like a retard
 
@Slereah That sounds like a very small number
 
@JaimeGallego Maybe for a small site
 
@0celouvskyopoulo7 why would it need to be bigger?
 
3:28 PM
5% of amazon is a fair bit
Although of course, the common passwords are probably different nowadays
 
@ACuriousMind wot
 
Now that people are required to type fancier passwords
 
Did someone get flagged
 
@0celouvskyopoulo7 Maybe...think about choosing a different simile?
 
A common password used to be "love", but a 4 letter passwords with only lower case wouldn't work on most sites nowadays
 
3:28 PM
@0celouvskyopoulo7 No
 
After that you can use brute force for a password, but that is much longer
 
@Slereah 4 letter passwords are very easy
just type whatever curse you have in mind
 
Well most people are lazy
 
@Slereah In terms of %, I mean. Don't underestimate how many grannies buy stuff online
 
fun fact: the PSE chat automatically hides your password if you try to post it here
 
user228700
3:29 PM
@JohnR: Watched ANH today!
 
********
 
So common passwords tend to just be sequences of close by keys
 
@AccidentalFourierTransform it works!
 
Hence a lot of 123... and qwert...
 
***
yep, it works
 
3:30 PM
@Kaumudi.H A New Hope? Good isn't it? :-)
 
user228700
@JohnRennie Yes, I liked it :-) Although, I didn't absolutely love some of the actors.
 
Though to be fair
 
@ACuriousMind oh come on
 
It's fairly rare that people actually hack passwords like that
 
correct horse battery staple
hey!
 
3:31 PM
Usually they just do fishing or they hack password databases
It's much more efficient
 
@Kaumudi.H The prequel trilogy are children's films, but the original trilogy is most certainly not!
 
Or they do the old social engineering thing
"Hello, I am the password inspector"
 
@PaulWhite I can't believe the first reference to that password xkcd took so long ;)
 
user228700
Luke Skywalker walks away from the death of his uncle and aunt like nothing had really happened.
 
3:33 PM
@ACuriousMind I was waiting...then nothing.
 
Also another method is
1) get a password from a easy place to hack
2) reuse that password for that person's other accounts
 
user228700
And c'mon, show some more emotion while engaged in battle. That light-saber duel toward the end was so unexciting! :-/
 
A lot of people reuse the same passwords for different sites
 
@Kaumudi.H I can't remember the film in that much detail.
 
@Kaumudi.H Well...nothing happened - the viewer was not emotionally invested in the uncle and aunt so their death is ineffectual in terms of the story :P
 
3:34 PM
these days I have to use a little notebook to keep track of my passwords
 
@Kaumudi.H are you going to watch the other two films?
 
It's quite annoying
 
user228700
@ACuriousMind Sure, but you'd think that it would affect him a bit more.
 
user228700
The actor showed no emotion at all. Nothing.
 
@JohnRennie Machete order - yes or no?
 
user228700
3:35 PM
@JohnRennie Most certainly, yes.
 
Visser's book on Kerr black holes has experimental bits
 
meh star wars
 
Oh boy
 
@ACuriousMind no, watch IV, V, VI, VII and try to pretend the prequels never happened :-)
 
@0celouvskyopoulo7 should I get Lee
And maybe Kobayashi
 
user228700
3:37 PM
To be honest, I don't feel super motivated to watch the rest of 'em but I will so that I can get a sense of why people think it's so amazing.
 
The Art of Deception by Kevin Mitnick is a great book on social engineering. The guy wrote several fictional stories and put them all there. The crazy ex-wife coaxing a lineman to reveal his husband's telephone number was legendary.
 
Wait, which Lee is Lee
He wrote a bunch of books on the same topic
 
@Kaumudi.H all these things you can do once the pressure of exam preparation eases a bit :-)
 
Introduction to topological manifolds, introduction to smooth manifolds or riemannian manifolds?
 
user228700
@JohnRennie Eh, I don't have very many things to do in the next day and a half so I may just watch the other two films while I'm stuck out here.
 
3:38 PM
ouch, Kobayashi is 150 bucks
no thanks
 
user228700
Couldn't even go to the town today :-/
 
@Kaumudi.H you need to bear in mind when ANH was released. In the late 70s life (in the UK at least) was rubbish. The country was paralysed by strikes and inflation was roaring away.
 
Are there any american adults here
@Slereah I got mine for 30
 
I wonder if non-Hausdorff manifolds can be embedded into $\Bbb R^n$ as manifolds with intersections if I identify the adjacent points
 
@Kaumudi.H When Star Wars was released it was an awesome way to escape the brutal reality of life in 70s Britain - for a couple of hours at least.
 
user228700
3:41 PM
@JohnRennie Right, right. I understand that :-)
 
Is there a specific name for "manifolds with intersections"
Like the figure 8 topological space
 
80's were the era of good movies
 
Wedge sums of manifolds
 
fantastic
 
that kind of stuff
 
3:42 PM
Yes it looks a bit quaint by modern standards, but 40 years of developing movie technology will do that.
 
@Slereah immersion
 
@JohnRennie back when you had to leave the coal mines and go to physics?
 
user228700
@JohnRennie No, I'm not complaining about the technology even one bit. I was only disappointed by the acting.
 
@Kaumudi Usually most of the cult classics you'll won't have good actors. But there some fascinating ideas out there
 
what is the figure 8 an immersion of?
 
3:43 PM
not everything is artistically great
 
@Slereah There are several generalizations of the notion of manifold that fit there, e.g. pseudomanifolds or stratified spaces
 
@JohnRennie You already had some startling movie technology in 70's though. Say, Kubrick's 2001
 
user228700
@0celouvskyopoulo7 Adult? Say, when does one become an adult?
 
of course there were lots of special effects from 70-80's
 
3:44 PM
@BalarkaSen I don't think that film has held up at all.
 
I might need that notion to actually draw non-Hausdorff manifolds correctly :p
 
It just looks quaint now.
 
@JohnRennie Well, what do you mean by held up?
It certainly was a breakthrough in terms of visual effects
 
@Kaumudi.H I have to pay rent and they want my social security number
I need to know if that's bullshit or not
An adult is someone who has paid rent
 
Does that seem like a good rough sketch of what informal QFT is
 
3:49 PM
5.
"there is are"
 
user228700
@0celouvskyopoulo7 Ah, OK.
 
Yes, there is are
(the list is partly stolen from Gibbons)
I also might include "There is a vacuum state $\Omega$ that is related to the vacuum state of the free theory"
by something something
Also maybe the quantization process from the Lagrangian
and maybe something about gauge
Also : what is Hilbert space. $\mathcal H$, $\mathscr H$, $\mathfrak H$ or $H$
I've seen all of those used
Probably not $H$ because I'll use it for the Hamiltonian
I guess I need to decide which one is the Hilbert space and which one is the hamiltonian density
Ideally the lagrangian density and the Hamiltonian density share the same script
Hm, what did I use for the density
Damn, almost up to a hundred page
 
@JohnRennie Halp
 
@BernardoMeurer you ignored my suggestion for reading a file of words ...
 
@JohnRennie Hm? :P
 
3:54 PM
... and went that that cur McKee's method!
 
Hehehehe
You can't win all the battles :P
 
I shall e-mail your professor to complain :-)
 
@JohnRennie How do I find the optimal height at which I must hit a snooker ball so that it rolls "perfectly". I.e. doesn't slip around
@JohnRennie Good luck, he's a chump!
 
@BernardoMeurer I have no idea.
I'd Google it :-)
 
22
Q: What do people actually mean by "rolling without slipping"?

pppqqqI have never understood what's the meaning of the sentence "rolling without slipping". Let me explain. I'll give an example. Yesterday my mechanics professor introduced some concepts of rotational dynamics. When he came to talk about spinning wheels he said something like: "If the wheel is ...

 

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