Mathematics - 2013-02-01 (page 1 of 2)

user19161

00:15

Geezis, why do people downvote more than they upvote?

user19161

The system should only only more upvotes than downvotes, let's make a proposal.

Tim

00:44

anyone feel like to talk about Kolmogorov extension theorem?

user19161

I am going to bed, good night guys.

Orange Harvester

@JasonBourne Dude, it must be 9 am at your place!

Jonas Teuwen

Kickass.

@anorton Haha, Did is the winner!

anorton

02:34

@OrangeHarvester Have you watched the intro videos to the Analytic Combinatorics course?

Orange Harvester

@anorton No. Not yet.

anorton

Ok. Just wondering. I'm hoping he's just giving an overview, and not expecting us to know all he's flying through... :)

Orange Harvester

Okay. :-) I will watch them and see.

math101

04:11

hmmmmmm

skullpatrol

05:04

mmmmmmh

math101

changed ur pic?

skullpatrol

yep, u like?

math101

hahaah love it

skullpatrol

:-)

math101

I cant follow what Ross is saying. Can you take a look at this

Check out his last comment under his answer

skullpatrol

05:08

sure,,,,

math101

hmmmmmm

skullpatrol

05:23

I'm not really sure, but I gave your question a +1.

math101

Thanks :)

I will ask Jason to help me tomorrow

skullpatrol

sorry i couldn't help

math101

Nahhh no need to be sorry :)

skullpatrol

:-)

what textbook are you using?

math101

That wasn't from a textbook

skullpatrol

05:29

oh?

math101

oh?

its from my prof

skullpatrol

icic

why not ask him?

or his TA

math101

nahhhhhh

BenjaLim

05:53

@math101 I saw your question

skullpatrol

06:04

Hi @MarianoSuárez-Alvarez Could you take a quick look at this please?

math101

06:18

@BenjaLim awww you are gone

Orange Harvester

If anybody is in here, can we say anything about the structure of the set a group action takes place on, depending on the group that is acting? For example, any generic group is a subgroup of $S_n$ for some $n$. Can something similar be said of the set on which a group action takes place?
@JasonBourne ?

Mariano Suárez-Alvarez

@skullpatrol what in particular?

Orange Harvester

@MarianoSuárez-Alvarez Ahh, nice you are here. Am I making any sense in what I just said?

Mariano Suárez-Alvarez

a transitive group action always takes plce (up to isomorphism) on the set of cosets of some subgroup

(the stabilizer of any point)

math101

@MarianoSuárez-Alvarez Can you check out my last comment on the answer. I dont fully grasp Ross's response to it

Mariano Suárez-Alvarez

06:24

if the action is not transitive, then it is a union of transitive actions, so etc.

@math101, a function is identically zero if it is constantly zero

math101

ohhhh great

Thanks :)

skullpatrol

Thanks :-)

Mariano Suárez-Alvarez

what happened to the chatlatex help thingie

Orange Harvester

Thanks. :-)

@MarianoSuárez-Alvarez the messages are pinned only for 30 days.

they have to be repinned.

user19161

@MarianoSuárez-Alvarez It became unpinned after 2 weeks.

Orange Harvester

06:26

2 weeks?

math101

JASONNNN

Orange Harvester

I thought it was 30 days.

Mariano Suárez-Alvarez

well go hunt it and star it again :D

Orange Harvester

anyway.

user19161

@math101 I did not sleep much, just woke up, can't think now...

math101

06:27

Ya mariano just explained it

skullpatrol

Yay

math101

Yay

user19161

@math101 Interesting huh? I have so many names: Will, Jason, etc...

skullpatrol

etc is your name also?

math101

hahaah

user19161

06:28

@skullpatrol And also ...

skullpatrol

i thought is stood for ET's Cousin ;-D

Orange Harvester

Etiquette Guidelines | $\LaTeX$ support for chat

5

user19161

@jay Would you like to look at a lhf I answered?

skullpatrol

@OrangeHarvester Good job, pal.

Orange Harvester

@JasonBourne Yes.

user19161

06:30

@mariano Must now pin it before it is gone.

math101

OMGGGG I knew it

Orange Harvester

Who removed the stars?

Star it!!

I will now get my second pinned message. Yay!

math101

@OrangeHarvester I asked you if you were somehow related to Jay and you denied it. MEANIE

LIAR

skullpatrol

Yay for the orange guy!

Orange Harvester

@math101 :D :D :-)

user19161

06:31

@OrangeHarvester math.stackexchange.com/questions/291623/… and math.stackexchange.com/questions/291810/…

skullpatrol

Hip, hip hooray :-D

user19161

@orange I forgot you are not @jay now.

Orange Harvester

@JasonBourne Yes. I cannot wait to get back to my username though. I do not like this username that much. Note to myself: your choice of nicknames are pathetic

math101

Are*

user19161

@OrangeHarvester Not as cool as mine. =)

user19161

06:33

@math Are you gonna change your username?

math101

hmmmmm Nah ppl wont recognize me then

Orange Harvester

@JasonBourne Well, my real name beats the shit out of all other real names, so. :P

math101

hahaha

user19161

@math101 People like who?

skullpatrol

@math101 Keep the the gravatar, it's cute ;-)

user19161

06:35

They all know I am the blue square now, so whatever I change my name to, they know.

math101

If people on MSE recognize me they may wanna help me out more

or not be as critical

user19161

@math101 Huh, why? math101 implies people wanna help?

math101

Noooooo but ppl have seen my username around

user19161

I think they don't like Jason Bourne so much, which is why I got less votes recently.

Orange Harvester

woo, woo, woo

user19161

06:37

So I think maybe I should change back to Will Hunting to get more votes...

math101

Interesting

skullpatrol

@OrangeHarvester That is cool.

Orange Harvester

@math101 hahaha. you just shifted a key to the right everywhere!

skullpatrol

...you must be getting tired...

math101

How do you pronounce comfortable?

Comftorble

Orange Harvester

06:40

come for table :P

math101

The English language is messed up

Orange Harvester

or may be you can "come for tea"

math101

mmaybe

skullpatrol

cumfort able

math101

I love Indian tea

Orange Harvester

06:41

I love English Tea

math101

ewwwwwwww no flavour to it

Orange Harvester

with all the muffins etc.

math101

hahaha

Orange Harvester

I mean, I love the concept of English tea,

math101

How do you pronounce iron?

iyorn

Orange Harvester

06:42

yes, something like that

user19161

Where is @petertamaroff? Now that I have 15k, I can befriend him. =)

skullpatrol

irun

math101

hahaha

@JasonBourne Peter rarely comes on these days

user19161

@math101 HAHAHAHAHA

Orange Harvester

@math101 but only when using it for the appliance, when using it for element, even I pronounce irun, else there is confusion with ions.

math101

06:43

hahahah

user19161

@math101 Why are you laughing? =)))

skullpatrol

because laughing is good

math101

When am I not laughing?!??! I find the silliest things humourous

user19161

I have a song for all of you...

math101

no offense to your joke @OrangeHarvester

what song?

skullpatrol

06:44

sing it

user19161

►

user19161

HAHAHAHAHAHA

Orange Harvester

@math101 :-)

skullpatrol

no not that

Ahhh

user19161

@math Listen to the song above!

Orange Harvester

06:45

►

skullpatrol

Like mick jagger says "i can't get no satisfaction..."

math101

@JasonBourne Yaaa I like that sonnngg

user19161

OMG, the Fri song is so AWESOME.

math101

The weirdest thing keeps happening

skullpatrol

what?

math101

06:48

Like I press send

but then it says an error occurred please retry

skullpatrol

that happens to me too sometimes

user19161

Yes, it happens now and then.

math101

ohhhhh

skullpatrol

i think it's the wifi

user19161

@math Do you like Justin Bieber?

skullpatrol

06:50

Beaver?

math101

Nahhhhhh

I like Taylor swift. Her We are never getting back together song

user19161

@math101 I really like this youtube.com/watch?v=kffacxfA7G4

math101

Ya that song its fun

skullpatrol

You and 1,525,225 others :-D

math101

But I am not crazy over him

I dont like his voice

user19161

06:53

I liked his voice before it broke.

skullpatrol

@math101 How about "crazy on you" by heart??

user19161

Did you guys notice the similarity between Baby and Friday?

skullpatrol

Yes.

user19161

Baby, baby, baby sounds like Friday, Friday, Friday.

math101

umm nooooooooo

ohhh ik what u mean

user19161

06:55

Now that you have heard these two songs @math, you are officially a member of the Banana Club!

math101

@skullpatrol Not my type

Who is part of this elite club?

user19161

Haha, I just made it up.

math101

AWWWW YEEAAAAAAA

I am the biggest procrastinator eva

skullpatrol

So you are the first nonfounding member

user19161

HAHAHAHAHA

math101

07:00

I am tireddddddd

user19161

@math101 Good night.

math101

hahah not yet

I am gonna finish the question I am working on

skullpatrol

@math101 How 'bout this? ... still not your style...

Orange Harvester

How to procrastinate effectively

user19161

My upvote to downvote ratio is about 12.

Orange Harvester

07:02

How to procrastinate productively

math101

@skullpatrol I like it

skullpatrol

:-D

Orange Harvester

More procrastination tips

math101

I know I am really picky when it comes to music

@OrangeHarvester I am really reading these articles :)

Orange Harvester

@math101 cool. :-)

math101

07:05

I am cool

Orange Harvester

[Even more procrastination tips](http://hercampus.com/life/academics/15-ways-productively-procrastinate)

Found all the ones I was looking for I think.

math101

hahahah

Orange Harvester

@math101 Nah, you are in Canada. You are cold. :P

user19161

@math101 I am hot.

math101

hahah

@JasonBourne I will be the one to determine that :P

Orange Harvester

07:07

@JasonBourne I would add something, but it would be too gross. ;-)

user19161

@OrangeHarvester What do you want to add?

Orange Harvester

@JasonBourne I'll mail you. :P

user19161

OMG.

math101

No fair

You are making me curious

Orange Harvester

Haha. Its not that interesting actually.

math101

07:10

You scared him away

Orange Harvester

Most recent spam I got, "Turn your life around! Get married now". :P

math101

hahahahah Great idea

Orange Harvester

@JasonBourne mail.check(new);

@math101 it must be quite late at your place now.

math101

Its 2:14 am

Orange Harvester

@math101 cool. It looks like I really scared Jason away. :P

math101

07:16

yaaaaaaaaaaaaaaa

robjohn

07:28

@user58512 I'm not sure if you're still wondering, but it is not only true for polynomials wth real coefficients, but it is true for power series with real coefficients. You can also try something like $\left(1+\frac{ix}{n}\right)^n+\left(1-\frac{ix}{n}\right)^n$ is real by polynomials with real coefficients.

Gnintendo

whee I have a Linear Algebra quiz this morning ^.^

It's over matrices: strict gauss reduction, strict back reduction, and strict gauss-jordan reduction

skullpatrol

Hi @BrianM.Scott welcome back!

Brian M. Scott

@skullpatrol Hullo! Just for a bit, though; have to get some work done $-$ or maybe some sleep instead. (Heresy!)

Orange Harvester

08:23

@anorton I saw the lectures, I think, the instructor was showcasing the techniques, rather than expecting them. I think that knowledge of generating functions and asymptotics will be useful though.

@Gnintendo What is meant by strict?

robjohn

@BrianM.Scott: hey there! I haven't been here at the same time for quite a while. How are things?

Brian M. Scott

@robjohn Could be worse. I’m not looking forward to the snow that’s headed my way, though.

Jonas Teuwen

@BrianM.Scott Well, you almost look like King Winter, so no biggie!

Brian M. Scott

Did you see the 5-th grade unit fractions question that exploded yesterday?

robjohn

@BrianM.Scott ouch. The temps here had been cold, but now they are heading upward.

Brian M. Scott

08:29

@robjohn We had cold/snow, warm, and now cold again, with lake-effect snow predicted.

Jonas Teuwen

I'm glad the bloody snow is gone.

Brian M. Scott

@robjohn How cold?

robjohn

@BrianM.Scott My son lives in Chicago right on the lake. Lots of similar weather.

Brian M. Scott

@robjohn We’re a little windier and I think a little colder, but yes, it’s pretty similar.

robjohn

@BrianM.Scott Just around freezing, so perhaps not as cold, but it was almost spring-like today.

Jonas Teuwen

08:30

It is a good day for harmonic analysis, I think. So, bye bye!

I seem to be like the only 'full time' harmonic analyst in this country 8-(.

robjohn

@BrianM.Scott windier than Chicago? Pretty bad.

Brian M. Scott

@robjohn Just around freezing can feel pretty damned cold if you hit it on the way down. On the way up from 15, say, it’s a lot nicer!

@robjohn I think so, yes.

@JonasTeuwen How can it be harmonic with only one? :-)

Jonas Teuwen

I am worth at least two.

So it can be complex.

It never ceases to amaze me how lame math jokes can be.

Alright, need to have some blood drawn. Judging from the number of 'X' on the form, that will be like 2 Liters.

But needs to be soberrr.

Brian M. Scott

@JonasTeuwen No point drawing two litres of whiskey!

Jonas Teuwen

Indeed, I'll say that.

Have a nice day/night.

Brian M. Scott

08:36

@JonasTeuwen G’night, or whatever!

skullpatrol

L8er

user19161

@robjohn He walks on water?

skullpatrol

nice

skullpatrol

09:04

we got 4 PhD's and a grad student in the house :)

Orange Harvester

@skullpatrol So, you are a PhD?

robjohn

@JasonBourne when it's cold enough...

skullpatrol

No, I'm a DhP :-D

Orange Harvester

I say @skullpatrol is a prof who has now retired and is here only for the pleasure of trolling people. :P

skullpatrol

@OrangeHarvester I say I'm a DhP to pump out all the hot air in this room ;-)

Orange Harvester

09:19

@skullpatrol Hmm, so you do not exist just as the wikipedia page. :-)

skullpatrol

@OrangeHarvester Nothing "exists" in the blackhole ;-)

@OrangeHarvester What you call "trolling people;" I call "pumping hot air out of the room." :P

Orange Harvester

@skullpatrol Ahh, makes sense. :-)

user19161

@skullpatrol I am Permanent Head Damage.

user19161

@skullpatrol Some places call it DPhil instead of PhD.

skullpatrol

Also LLD.

DSc.

DEng.

DEd.

DLit.

Charlie

11:14

Nobody home....

N3buchadnezzar

11:38

@Charlie Hi

Orange Harvester

12:23

@JonasTeuwen In your website, you have the following code.
`<link href='http://fonts.googleapis.com/css?family=Merriweather:700,300' rel='stylesheet' type='text/css' />`
`<link href='http://fonts.googleapis.com/css?family=Droid+Serif' rel='stylesheet' type='text/css' />`

Both of the files provide font-face{}

So, does the second one supersede the first one, and hence, is the first one vestigial?

Novice

12:55

I find this ridiculous.

-1

Q: how to add/subtract than multiply fractions?

Q). 1 + 9/2 x -5/7 Q). 1 - y^2 x 9/4 just guide me how to solve this question

First, I learned about fractions before I even knew internet had forums.

How is the one with the above query 13+?

And the same user has a question related to coordinate geometry. WUT

@JasonBourne You don't even have an answer there

Orange Harvester

13:30

He is probably a seven year old boy. :P

Novice

What... at that time, I didn't know what geometry meant.

Orange Harvester

Hmm.

may be not a native speaker.

Novice

No, I did study geometry, but I didn't even know that it's only about figures. I thought it was just the name of my book. LOL

Orange Harvester

Well, when he asks about angular points, I had to look up what they mean. They are basically the vertices, it is obvious that he does not even know what rectangles are.

May be it is an effect of the "new math" teaching.

Novice

Sure it is.

Orange Harvester

13:44

Here are 100 points I will never see again. :'-(

People should be allowed to opt out of community posts. :P

Novice

It is very sad indeed. I have a community wiki post with 50 points.

user19161

14:49

I looked through some old answers today and edited them. I hope they are alright now. Trying to give people less reasons for a downvote!

user19161

Ah, I mentioned in chat the there should be a feature preventing more downvotes than upvotes, I see it is now a meta question!

Orange Harvester

15:18

@JasonBourne the feature is not constructive IMHO.

This answer makes a lot of sense.

Novice

@OrangeHarvester I feel sad for the -42.

Orange Harvester

@Novice Well, Jeff Atwood left the community two years later.

Novice

@OrangeHarvester I think he left StackExchange.

Orange Harvester

@Novice Yes, that is what I meant by community.

He wanted to spend more time with family.

(His blogs are still awesome.)

Novice

15:33

@OrangeHarvester Yesh, I did see that on the blog.

Charlie

@N3buchadnezzar hi øinstein

user58512

what is the invariant of this dx/(1+x^2) differential?

Charlie

@user58512 ping someone, maybe robjohn

Orange Harvester

16:14

@Charlie Yo.

skullpatrol

@Charlie Ya.

Ed Gorcenski

16:29

Man, my bank's two factor authentication is creepy. Being able to pull up old addresses? Knowing where I lived when I was three years old?

I didn't provide them with that information

Chokladkakan

@EdGorcenski Are you certain it isn't an authentication system looking to steal your identity?

Ed Gorcenski

Yes; it presents multiple choice options.

The questions are too specific that the probability of presenting an option that is correct (without already knowing it is correct) is extremely low

Chokladkakan

It was, perhaps fruitlessly, meant to be a joke of sorts. :)

Ed Gorcenski

Yeah I know ;) But it is a fair question to ask, either way

One should always be wary of man-in-the-middle attacks.

Chokladkakan

Certainly. Remain vigilant!

skullpatrol

16:34

Trust no one.

Chokladkakan

Especially people with skulls for avatars. They're probably Death Eaters.

skullpatrol

lol

Weltschmerz

Is there anybody here familiar with the definition of the tangent bundle?

skullpatrol

A bundle of tangents?

Ed Gorcenski

16:54

This is agonizing to watch: youtube.com/watch?v=NG0-OEUiohI&feature=player_embedded#!

skullpatrol

Yep...

Charlie

17:24

@skull @orange hi

skullpatrol

@Charlie @robjohn hi

Orange Harvester

@skullpatrol @Charlie hi

skullpatrol

This looks like the chain rule for @'s

2

Charlie

How are you guys?

skullpatrol

Fine thanks, and you?

Charlie

17:27

I am good

Orange Harvester

ROTFL

Charlie

@Argon Labbit

skullpatrol

$$\frac{@OrangeHarvester}{@Charlie}*\frac{@Charlie}{@OrangeHarvester}$$

Orange Harvester

@skullpatrol :-) Nice.

Charlie

@OrangeHarvester :)

Orange Harvester

17:34

okay guys I am off. see you later.

skullpatrol

L8er

Charlie

Bye

skullpatrol

@Charlie Are you going to watch the Super Bowl?

Charlie

@skullpatrol nope

@skull do you like [this]( m.youtube.com/#/watch?v=JRfuAukYTKg)

?

Orange Harvester

@robjohn Is it okay if I post not extremely high quality question answer pairs? I know its okay to ask really easy questions, but would it be okay if I post the answers myself too (to those simple questions)?

Tobias

17:42

@OrangeHarvester why would you post the question if you know the answer?

Charlie

@enderland hi

user19161

@OrangeHarvester It is alright if you think they contribute to the site.

enderland

@Charlie Hello :-)

user19161

@Tobias The site exists not just to solve asker's problems but for the world to read and benefit.

Orange Harvester

A few reasons
1. It gives me oppurtunity to verify that the solution is indeed correct. (I self study, so even though I get an answer, and I am pretty sure about it there is no real way to verify the solution completely.)
2. It allows probably other people to offer me better solutions.
3. I can do so on a blog, but then it might not get the same attention on the blog.
4. MSE's editing capabilities are better than almost all other blogging software I have found.

Charlie

17:46

@enderland how are you?

enderland

@Charlie oh it's a friday hah

Charlie

@enderland yes! :D

user19161

@enderland I saw your question.

Tobias

@OrangeHarvester the usual approach when the purpose is to see if your solution is correct is to include the solution in the question

user19161

@enderland Is that a real life problem or an exercise you need to solve?

Tobias

17:49

the purpose of posting both question and answer is usually to share some knowledge

enderland

@JasonBourne technically it's for a game I play lol

people post voting results with percentages

and there is some strategic advantage in being able to reverse engineer what percentage of them voted (ie if a group has 100 people and only 19 voted, that's valuable info)

skullpatrol

@Charlie Yes...it very thought provoking...

Charlie

@skullpatrol :)

skullpatrol

@Charlie ;-)

Charlie

@skullpatrol ;D

skullpatrol

17:54

@Charlie ;-D

Charlie

@skullpatrol ;-)

robjohn

@OrangeHarvester If you are honestly trying to learn or teach, then go ahead. I cannot vouch for what the rest of the community will say.

Tobias

@OrangeHarvester an alternative way to get verification on proofs is this chat or one of the #math rooms on IRC (by uploading the proof to mathbin.net or similar)

enderland

@JasonBourne why do you ask?

user19161

@enderland Well, it's good to know where something comes from.

user58512

17:57

@robjohn, but I don't think it holds for infinite series with real coefficients

robjohn

@user58512 why wouldn't it? If the series converges, the term by term conjugate sums to the conjugate of the sum.

Transcript for

$Mathematics$ Mathematics