I'm looking at Ivey and Landsberg and they have G2 as the Automorphism group of a 3 form on a 7 vector space

So I'm not sure what your problem is

Had what you said not made sense, I would have commented. But I was sure it was correct.

Hmm, I don't think I've ever heard of the automorphism group of a form.

Isotropy group is more appropriate, AFAIK

But hey, I guess it can work ;)

Aut(φ)=G

Page 324

I believe you :)

Oh, you said isotropy group?

I said stabilizer

Same thing

The reason Automorphism group is a bad way of saying it is

because of course the concept of an "isomorphism of forms" makes no sense

At least not obviously so

So automorphism should also not make sense

Since automorphism should mean self-isomorphism

Dude. I've seen people say "the curvature tensors are isomorphic"

Ya feel me?

People use isomorphism in different ways

Sorry my phone is lagging in the eye doctor's office

Today's edition of "Fun with misspellings":

@Kaumudi @ACuriousMind @MAFIA36790 @DanielSank yes I'm at the doctors

@0celo7 Can I ask you a question?

No.

Well then...

@ACuriousMind oh my god. A bunch of people in my lab are taking Fortran and they're having to pronounce Laplace, Euler, Riemann, Runge-Kutta, etc.

How the hell does one butcher names like that?

It's incredible

From the same post

> possion

You-ler

Reeman

Runj-Kut

La-pass

Leebnitz

@bl00 Assuming I read that right, that would actually be the correct pronounciation.

The eu in Euclid should make the same sound as the eu in Euler.

Wrong

We're not Greeks

For instance, it is correct in English to say Bajoran

Only for the inhabitants of Bajor

@ACuriousMind I don't agree! Euclid was not German :P

@Danu So? The Ancient Greek $\epsilon\upsilon$ made the same sound as the German eu.

@ACuriousMind I don't believe that. Really?

I seem to recall it has mutated into an "ef" sound in modern Greek

My brother has a Master's in classics---let me check.

@ACuriousMind The modern pronunciation is Evvklides

Yeah, that's what I thought

the υ now has two pronunciations depending on context

f or v

@Danu Otherwise my four years of Ancient Greek have taught me falsities

pretty reasonable option :p

Not arguing, really

It's a ducking fight to the death.

Oh!

@ACuriousMind you should ban Danu and see what happens

What happens is that he unsuspends himself :P

@0celo7 oiler isn't it

@ACuriousMind lmao

@ACuriouMind YOU SO WRROOOOONG :P according to my brother

Well not egregiously wrong, because the supposed actual pronunciation is not a sound your language actually allows for :P

@Danu What is the Ancient Greek pronounciation according to him?

I'm willing to believe that the phonemes don't match exactly, but German eu is the closest sound German has

Ehm... I'll try to find the phonetic symbol for it maybe

Great, now I'm reading Wiki on Ancient Greek phonology

Thanks for that :D

@Danu You're right, the eu in Euler is ɔʏ in IPA, while Greek $\epsilon\upsilon$ is a true eu in IPA

Oh dear, when I try to pronounce 'eu' it does sound a lot more like You-clid than Euclid...

Hahaha

Dammit, one more teacher on the list of those who lied to me :P

Although I do have trouble pronouning 'eu' in a way that is distinct from the 'ju' of you and still a single sound

Because what I'm rather certain of is that the Greek $\epsilon\upsilon$ was not two syllables/two distinct vowel sounds

Oh my god my eyes are numb

...

Now I've got my brother also confused :D :D

lol

Ahaa

The wiki page on phonology says that many of those diphtongs turned the 'u' sounds into a 'w' sound

That's just what my brother was on about, too :D

Although this seems more true if followed by another vowel...otherwise, the 'u' might not have been pronounced at all

It appears we don't have the slightest idea how Euclid was actually called :D

I can't see in either eye now

@ACuriousMind German detected

Hehe

@bl00 my eyes are being dislocated

It's like I'm drunk

No I'm getting my eyes dilated on the side of a road

By a homeless dude

Ah well, I knew my Latin pronounciation was bogus, now I know it for my Greek, too!

Setting yourself up for a Pontryagin, @0celo7?

@ACuriousMind Thus is life

The more you know, the less you know

@Danu what?

Look it up

I'm bad at math, so probably not me

Also wtf why is everything so far

But in one eye

I literally cannot see in one eye anymore

I think I'm broken

You should probably get off the internet.

I'm in a waiting room

Yes

Retina specialist

@0celo7 Eye hope you get better soon :(

GOOD LUCK @0celo7

(I'M USING BIG LETTERS SO YOU CAN READ WHILE YOUR EYES ARE DILATED)

@rob only one eye seems to be dilating properly.

So I'll be waiting even longer once the doctor figures it out

My evidence is that I can read my phone

But only with one eye

Nope

Why would I be scared?

Of what?

I already said I'd be fine with losing it

Sure.

But we can't always have what we want

It is weird to be at the doctor's without parents though

@bl00 0celo7 means business. Vision loss in one eye won't stop him from dominating math

though 2 might be an issue

I'm an engineer

right

I don't like math

@0celo7 hey engineer guy. If I were to send sound waves via , say a tuning fork, down a column of air with a section of water, would I be hearing the reflected sound waves off the water only, or would I also hear the reflected sound waves that travel all the way to the end of the column and back?

Not that kind of engineer.

oh right you want to make bombs for 3rd world countries

forgot

No, against them.

To be used against 3rd world countries.

@0celo7 youtube.com/watch?v=aWejiXvd-P8 like father like son

Ground zero ocean.

We will build the biggest nuke the world has ever seen, and make ISIS pay for it.

YEAHHHHHHH!!!!!!!

@bl00 plz no flag

Flag it if in doubt.

I flag first, and don't ask questions.

@bl00 no I don't want to read garbage.

@bl00 do you think there is a physical limitation in measuring this scenario: listening for a signal while a liquid (somewhat) slowly moves down a column with marked ticks (cm) and then marking the location of the liquid when you hear the signal?

I want to say yes but I don't have any concrete reasons.

lab report

Gee, thanks. I'm trying to explain what the human error was.

No eye cancer.

@0celo7 did you ask him if it was eye cancer?

@bl00 I need stronger glasses.

@Obliv he told me to stop trolling :(

Even in real life @0celo7 gets called a troll

@0celo7 you should probably stay off of 4chan for a while until your eye heals. Probably a leading factor in this issue.

@bl00 I think it was the 2nd explanation you gave. The first doesn't strike me as a reason for error. There is delay in processing the information but when it is processed, you should know exactly where the liquid was when you heard it. Though, the truth is the signal is an antinode of a sound wave so the spot you think the antinode was, was probably not it.

@Obliv Goes to University of the Moon

@bl00 I went with "The detected antinode must be perfectly coordinated in both hearing and vision"

@bl00 he's a sophomore

Wait this doesn't make sense. If the antinode is located at the air-water border, then why are we hearing the antinode?

Oh Okay so the reflected wave is at the amplitude of the incident wave.

It doesn't change.

I think the eye doctor made a mistake on the note

the prescription for the glasses

If it's only in one eye you should totally wear a monocle @0celo7

This lab is b.s. it's not resonance if the sound waves end at antinodes. There is no fundamental frequency here

Goddamn notation. Taking $\mathbb{C}^2/\{\pm1\}$ at face value, I was wondering "which" of the two $1,-1$ pairs should be identified. Now I'm reasonably sure the authors actually mean the group $\mathbb{Z}_2$ acting on $\mathbb{C}^2$ in...some way, probably mirroring or half-rotation.

@ACuriousMind What?

Which of the two to leave, which one to "move"

Oh.

@ACuriousMind But that notation is pretty standard AFAIK.

Trying to read math on the phone doesn't work.

@Danu Doesn't make it less terrible! Luckily this one was easily seen because they remove "the singularity at zero" on the next page.

Haven't you seen it in e.g. the definition of $\Bbb R\rm P^n$?

$S^n/\{\pm 1\}$?

I have.

It denotes the antipodal involution

$S^n/\mathbb{Z}_2$ in my world, always

Weird.

Nopez

@ACuriousMind It's probably what Danu wrote in BBS

@Danu See, would writing "the quotient of complex space by the antipodal involution, $\mathbb{C}^2/\{\pm 1\}$" instead of just writing $\mathbb{C}^2/\{\pm 1\}$ been so hard?

I can live with terrible notation as long as it's explained the first time it is used

@ACuriousMind That's what your topology professor in alg. top. 1 does for you :D

Blame your professor :D

No, he was awesome

@bl00 That joke was kind of cornea

I can't fucking see in the other eye now

@Danu Yes hi i am new to physics. What is the antipoodle revolution?

lol

It was the terrible time after the terriers came to power

@ACuriousMind I Deleted The Question But I still have questions for you or anyone after I'm done with this lab

Ok I can see again in that eye :)

@Obliv Well, I didn't mean for you to delete the question, I just left the comment because what the correct answer is would have depended on the answer to that comment.

OKay

ACM is a tyrant

I loaded up the data set from hanford on the first LIGO detection

it's 32 seconds around the detection

this is gonna need some clean up :P

>Mac

Wow

what's wrong with Mac?

@ACuriousMind yeah actually you're right. I thought I phrased the question wrongly when I Deleted it. I'll look over it afterward

I switched from Gentoo a year ago now

macports isn't nearly as good as portage but it gets by....

@GPhys I've been told macs are terrible

o

it's a decent laptop, I think

I love mine

haven't had any heat issues, keyboard is fine

But people always tell me it's terrible

I like Windows too

@GPhys I dual boot

I haven't used Windows since I was a kid, so I'm not sure these days

Tfw there's a dude in a robe with nothing else on

College is weird.

Hello, all

Well, absence of people, anyway.

@heather no cancer.

@0celo7, good! Glad you finally went to the doctor. =)

@0celo7, real analysis...do you have a textbook recommendation?

Abbott.

okay

just finished my spanish homework

@bl00, hmm, now that I think about it, that does make sense (the calculus bit)

and I know about the whole "in-order" thing

I am going in order

I'm just also going out of order at the same time =P

The order is so overrated.

@0celo7, right? In school it's like, oh, do this, do that, do the same thing 5 years in a row for elementary, now you can get to the good stuff =)

I just read the proof of the irrationality of 2.

<3

Have a good night everyone.

bye

bed time already?

@heather The proof of the irrationality of e is more beautiful