Mathematics - 2013-05-19 (page 1 of 3)

Faust7

00:00

yeah but thats A+ analysis work i proved a solution existed =P

Jonas Teuwen

@GustavoBandeira The wish to be come gay might very well be the result of such. Or maybe because you know a very attractive boy and you would like to enjoy sexy time with him.

Faust7

the odd thing is it used to be extremely common back int he day

and no one really thought much of it, especially in greece etc.

Jonas Teuwen

You like adjectives.

Faust7

i hate english

somehow more then i hate this analysis assinment

but working up to it.

Gustavo Bandeira

@JonasTeuwen Yes. But the problem is that there are times when it isn't the case, also: That argument is heavily used by religious institutions to give less legitimacy to homossexuality.

Jonas Teuwen

00:05

Your hate is quite obvious.

@GustavoBandeira I am unaware of and religious institutions in NL that do that...

Gustavo Bandeira

@JonasTeuwen In Brazil, EUA, etc.

There are a LOT!

Jonas Teuwen

The most 'outrageous' thing they have said is something like 'Being a homosexual is totally different from consumating it.'.

Gustavo Bandeira

Jonas Teuwen

Yes, but those are clowns.

Gustavo Bandeira

brb

Faust7

00:09

wth does $U(f^2,P) $ mean?

Jonas Teuwen

The same but with f^2.

Faust7

what does f^2 mean

u square your function?

Jonas Teuwen

Ỳes.

Faust7

hmm ok, that makes no sense at all.

Jonas Teuwen

Ýes it does.

Faust7

00:17

perhaps to you but in the context of the upper limit thats nonsense to me =p

Jonas Teuwen

That is irrelephant.

Michael Greinecker

@Faust7 Your function is not discontinuous everywhere, it is only discontinuous on the rational sets. The rationals are countable and have Lebesgue measure zero. A bounded function on the unit interval is Riemann integral if and only if the set of discontinuities has Lebesgue measure zero.

Jonas Teuwen

If he doesn't know what $f^2$ means, you still have hope he knows what 'almost everywhere' means?

Michael Greinecker

I wanted to say something sufficiently official sounding to convince him it is indeed integrable.

anon

heh

Jonas Teuwen

00:22

It's interesting. Usually in pseudodialogues people only refer to your sexuality after you've been stimulating responses for a while.

@MichaelGreinecker In that aspect you could say 'almost surely'.

Faust7

i know that the rationals are countably infinite

Jonas Teuwen

That has absolutely like nothing to do with it.

Michael Greinecker

It actually has.

Jonas Teuwen

I need to get up in about 5 hours so I better head off to bed.

Michael Greinecker

G'night.

Faust7

00:25

saldy i have never heard of this lesberg measure zero =(

Jonas Teuwen

@MichaelGreinecker Was referring to topological properties/analytic properties.

In this case, duh, as it has no atoms. But. Bye.

Faust7

i got some guy named darborx?

Jonas Teuwen

Darboux asshole.

Faust7

prof must got it wrong cause thats what my notes say...

Jonas Teuwen

Alcohol and writing only mixes if you're Hemingway.

And he's dead, and you seem to be alive.

Faust7

00:27

its that math logic for Faust $ \neq $ Hemingway ?

Jonas Teuwen

No.

I like Hemingway.

Michael Greinecker

I gotta leave too, even though it is morning here (Brisbane right now). Bye folks!

Faust7

yeah this definition doesnt seem too confusing but if possible id liek to use the definition i have on my hw assinment

Charlie

00:48

@argon $\huge \text {אהרון}$

Ethan

01:02

$$24abc=(a+b+c)^3+(a-b-c)^3-(a+b-c)^3-(a-b+c)^3$$

$$80abc(a^2+b^2+c^2)=(a+b+c)^5+(a-b-c)^5-(a+b-c)^5-(a-b+c)^5$$

$$\frac{1}{\ln(q)}=\sum_{n=-\infty}^\infty\frac{2^n}{q^{2^n}+1}$$

$$\frac{1}{1-q}=\prod_{n=0}^\infty(q^{2^n}+1)$$

$$\frac{\ln(q)}{q-1}=\prod_{n=1}^\infty\frac{2}{q^{2^{-n}}+1}$$

$$q=\sum_{n=0}^\infty\frac{(-1)^nq^{2^n}}{(1-q)(1-q^2)(1-q^4)(1-q^8)...(1-q^{2^n})}$$

Charlie

@Ethan Hah gotcha

Faust7

PEANUT BUTTER JELLY TIME

Charlie

@Faust7 peanut butter jelly, peanut butter jelly

Faust7

I got some hamburger patties in my freezer that could be as much as 6 months old, whos things there ok to eat?

Charlie

i wouldn't

Argon

01:12

@Charlie מרילה!

Charlie

@Argon YAY!

Faust7

hmm.. but there frozen?

Charlie

@Faust7 THEY'RE

Ethan

shut up charlie

Charlie

@Ethan YOU SHUT UP, KID

so what?

Faust7

01:15

thats kool

Ethan

thx

Charlie

@Faust7 cool

@Ethan thanks

Argon

Oh noes, the new Jasper!

:)

Charlie

@Argon Aary, Aary....

Argon

@Charlie hehe

Charlie

01:18

@Argon i made an autopsy in a music box today...so funny!

I remembered you

Argon

@Charlie Autopsy? Is it dead?

Charlie

@Argon no no

i could see how does it work

Argon

@Charlie Ohhhhhh! :)

They have a comb-thing

and a cylinder with bumps

Charlie

@Argon yes! I remembered Amir's face!

Argon

@Charlie Hahaha so good

Charlie

01:28

@ethan stop removing things

or I will go to California...

I make a trio, a tour, have some fun

And then make you stop!

Argon

$$\sum_{n=1}^\infty \frac{\sin n}{e^n} = \frac{e\sin 1}{1+e^2-2e\cos 1}$$

@Charlie After your trip to Argentina?

Charlie

@Argon yeah

@Argon then I'll go to Toronto ;)

Argon

@Charlie Not to yell at me, I hope }:)

Charlie

@Argon no, of course not

DanZimm

02:28

@Ethan ohai

user52523

I would be very appreciate if you review my problem: math.stackexchange.com/questions/395561/compactness-property

Mariano Suárez-Alvarez

03:14

(removed)
(removed)

But in any case...
(removed)

BODMAS

ultrasigh

Will Jagy

03:45

@mariano, cute piece of dialogue from a movie, Your Sister's Sister. Iris is sending Jack to spend some alone time at her father's cabin. She says, "There is no TV, no telephone" Jack syas"Are there forks? Because i may need to stab myself in the face"

I looked it up, BODMAS is not a Tibetan Buddhist thing as you would expect.

Will Jagy

04:35

$$\begin{array}{l}\text{Turning and turning in the widening gyre}\cr
\text{The falcon cannot hear the falconer;}\cr
\text{Things fall apart; the centre cannot hold;}\cr
\text{Mere anarchy is loosed upon the world,}\cr
\text{The blood-dimmed tide is loosed, and everywhere}\cr
\text{The ceremony of innocence is drowned;}\cr
\text{The best lack all conviction, while the worst}\cr
\text{Are full of passionate intensity.}\end{array}$$

Babak S.

04:58

Hi everybody. :)

Can you guess why the user17762 deleted his answer? math.stackexchange.com/a/396034/8581. I cannot find any defects in it. ????

Click Me

Hello, what is the best way to express the square of a function $b(x)$? $[b(x)]^2$ or $b^2(x)$?

Babak S.

@ClickMe: Both, I think, are OK.

Click Me

@BabakS. OK. Thank you.

SSK

Hi Guys

Babak S.

Hi @ssk

SSK

05:06

I am so weak in maths

leaning maths

:)

Gustavo Bandeira

@SSK Congratz. For learning it.=)

SSK

;0

;)

=)

XD

thanks man

chhan92

hello

can i just ask you a quick question?

(so quick that i feel shame to post it as actual question on this website)

some references on spectral curve of integrable systems talk about spectrum being simple

I tried finding the definition, but I couldn't find it. What is the definition of simple spectrum?

when spectrum here means that the set of eigenvalues of (finite dimensional) matrix?

SSK

Don't feel shame

make post of it with proper wording

every one will answer you're questions answer...

chhan92

ok thank you for encouragement

Gustavo Bandeira

05:28

@chhan92 Post it there dude.

I am the owner of this site.

Relax.

Vrouvrou

Hello

SSK

30

Q: Should I ask stupid questions?

As I'm starting to study mathematics and I feel like to ask a lot of questions, but I'm aware that I could answer part of them alone instead of just asking. Sometimes I can answer the question a few minutes after making the question on SE and after that I usually wish to erase it. Last time I d...

Read this

:P

Mariano Suárez-Alvarez

05:50

can someone explain math.stackexchange.com/questions/394031/… to me?

if $u$ is a linear function, then $\nabla u$ is a constant vector...

Gustavo Bandeira

06:08

@SSK xd

Vrouvrou

someone tell me why (\int_0^t e(s) ds)' = e(t) ?

please

Jayesh Badwaik

@JonasTeuwen Next Emacs

Vrouvrou

hey please someone knows why (\int_0^t e(s) ds)' = e(t)

?

why d/dt (\int_0^t e(s) ds) =e(t)

Jayesh Badwaik

06:28

@Vrouvrou Have you studied the Fundamental Theorem of Calculus?

Vrouvrou

i don't remember why d/dt (\int_0^t e(s) ds) =e(t)

can you help me please

someone ?

Vrouvrou

06:50

so you don't have the unswer

answer

Jayesh Badwaik

07:32

@Vrouvrou search for leibniz integral rule.

Jonas Teuwen

08:16

@JayeshBadwaik That's a lie.

It's like... a baby.

Zolomon

$$\lim_{x\rightarrow \infty} \arctan(\ln x) = \begin{bmatrix} t=\ln x \\ x \rightarrow \infty \Rightarrow t \rightarrow \infty \end{bmatrix} = \lim_{t\rightarrow \infty} \arctan(t) = \frac{\pi}{2}.$$ -- Why is it allowed to use equality between these steps, why isn't implication/equivalence used?

Because the substitution doesn't change the output in the first step of the statement?

Also, my lecturer prefers to write it like this:
$$\lim_{x\rightarrow \infty} \arctan(\ln x) = \begin{bmatrix} t=\ln x \\ x \rightarrow \infty \Rightarrow t \rightarrow \infty \end{bmatrix} \lim_{t\rightarrow \infty} \arctan(t) = \frac{\pi}{2}.$$

What's the difference, and which is more correct?

Gustavo Bandeira

@Zolomon The difference is that the first one has one more equal sign. Q.E.D.

Yes. My name is captain obvious and I am here to save you.

Zolomon

:) You missed answering the second part of the question however!

Gustavo Bandeira

@Zolomon You should be happy with $50$%.

Zolomon

Haha

Gustavo Bandeira

08:25

You're being greedy, dude... C'mon...

Zolomon

Satisfaction never got me anywhere.

Gustavo Bandeira

It could take you at interesting places if you search for it: Try to look for Satisfaction Man Version on YT.

SSK

0

Q: Off topic Question

I am fed up of using MS paint for creating diagrams and posting images on our board , do you have any application which will me to create diagrams easily . which must be portable or is there any website to design diagrams. somebody please edit my tags .. Thanks

homework

Zolomon

Do you happen to know the terminology of the subject for my question so I can google it? Mathematical equality notation feels too broad.

Gustavo Bandeira

@SSK XD

SSK

08:28

:)

Zolomon

@SSK projects.gnome.org/dia

@SSK You can use google spreadsheet which is online based and free, or open office?

SSK

oh

google allow ?

Gustavo Bandeira

@Zolomon Dia is the name of a contraceptive in Brazil.

Zolomon

@GustavoBandeira :D

Gustavo Bandeira

@SSK See my answer.

SSK

08:32

yeah checking

Gustavo Bandeira

@SSK Geoegebra is really nice.

Jonas Teuwen

It is ugly.

Gustavo Bandeira

SSK

hahaha

Gustavo Bandeira

Mathematics is for laxy people? Dude. I wanna get real lazy.

For the people who searched the 4th line, the answer is in the first: "No, mathematics is not for all, only lazy people can do it".

The best part is that mathematics is nice and noble but mathematicians are lazy.

SSK

08:39

Gustavo

buddy please vote up

:P

Gustavo Bandeira

@SSK It was tranfered to the meta

SSK

yeah my points down :(

my earned points

Gustavo Bandeira

@SSK Relax.

SSK

math.stackexchange.com/questions/396166/…

Chris's wise sister

09:55

Greetings

Nimza

Hi! I have a question on definition: is the function $f \colon \mathbb Q \to \mathbb R$, $f(x) = x$, differentiable in the sense of freshman calculus?

user34397

hi

Jayesh Badwaik

10:23

@JonasTeuwen Hence the words "next".

user34397

10:41

@gustavo hows the election going ?

Chris's wise sister

@JayeshBadwaik hi . How is it going? :D

Jayesh Badwaik

@Chris'swisesister Hi! I am good. Some administrative work today. :P What about you?

Chris's wise sister

@JayeshBadwaik fine. I'm working on a problem I conjectured during my sleep.

Jayesh Badwaik

@Chris'swisesister Ahaaa, which one?

user34397

@jayesh hi...

Chris's wise sister

10:46

@JayeshBadwaik I'll post it here a bit later. Now I have the lunch.

Jayesh Badwaik

@Chris'swisesister no problem. :-) Enjoy!

@user34397 hello...

Chris's wise sister

Thanks :D

user34397

@JayeshBadwaik aaj sab log ignore kyun maar rahe hain?

Jayesh Badwaik

@user34397 Sunday hai, sab relax kar rahe honge.

user34397

@JayeshBadwaik itna bhi kya relax karna :-|

sunday se yaad aaya: kal monday hai. school jaana padega!

Jayesh Badwaik

10:50

Good. :-)

user34397

@JayeshBadwaik not good!

Jayesh Badwaik

School Mondays pe itni taklif hai toh job mai kyaa karoge? :P

user34397

job nahi karunga :D

Jayesh Badwaik

dekhte hai :P

user34397

fixers ka kuch hua?

Jayesh Badwaik

10:58

Pataa nahi

pada nahi

Mats Granvik

12:50

Notice the dot in front of 6 to 8.

A dot in front of the B, that is.

skullpatrol

so

?

Mats Granvik

@skullpatrol This was the mindmapping technique I used when I was studying.

user34397

13:27

@skullpatrol Hey man!

@MatsGranvik Are those Venn diagrams?

Gustavo Bandeira

@user34397 I woke up now.

user34397

@GustavoBandeira Good morning!

Gustavo Bandeira

@user34397 What toy mean with "how's the ellection going?"

user34397

Just asking about what you are feeling right now.

Gustavo Bandeira

13:43

@user34397 Now I'm just sleepy. :P

user34397

I wished to include my question in the questionnaire, but it's closed.

Mats Granvik

13:56

@user34397 Yes the first three are Venn diagrams.

The above is an example sentence that I took from the paper: cs.nyu.edu/~davise/papers/singularity.pdf

Gustavo Bandeira

@user34397 What question?

user34397

@GustavoBandeira It's not directly related to moderation, but reflects the character of the candidate.

Gustavo Bandeira

14:45

@iostream007 $\implies$? — Git Gud 4 mins ago

XD

Πάρτη Κοχλί

@GustavoBandeira lol

Those who love classical logic would be running with their knives right now.

hey

15:00

hi

is it a good way of solving predicate logic (quantifiers) with digraph when you have a set of relations?

Mats Granvik

15:11

@hey Is your question directed to a specific person in this chat room?

Me! Of course.

Never mind.

Gustavo Bandeira

Is it only me or Serge Lang is a great communicator in mathematics?

mick

Hey guys

what happens if I do not give the bounty ?

Gustavo Bandeira

@mick It won't get back to you.

mick

yes i know , but what will happen , will it be given automatic to the highest rated answer ? even if that rating is 0 ?

Gustavo Bandeira

I don't know but Lang's books seems to be so clear. It's kinda Like Halmos.

They're very good expositors.

mick

15:19

my issue is that the answer is not clear to me , but i have limited skills , so not giving it might be wrong :/

I replied with a comment to ask to clarify , but time is running out.

@DominicMichaelis I voted for you. Now you owe me :)

Dominic Michaelis

@mick oh thanks :)

mick

How do I find a girl who is into fisting ?

I probably should stop reading the starred messages :)

Gustavo Bandeira

@mick Use <h1></h1>, <h2></h2>, <h3></h3> in your questions.

mick

@GustavoBandeira what does that do ?

Gustavo Bandeira

@mick Look.

mick

15:33

thanks.

Im asking a new question related to my remark to the answer given.

@GustavoBandeira

somaye

15:45

hi

@WillJagy are you here?

mick

@somaye hi.

somaye

@mick hi

mick

Cmon guys tell me , how do I find a girl who is into fisting ? :)

Gustavo Bandeira

@mick Google?

mick

@GustavoBandeira for real ? I think i will only get porn

somaye

15:47

@GustavoBandeira hi

Gustavo Bandeira

@mick Isn't this what you're looking for?

@somaye Hello! =)

mick

@GustavoBandeira no thats for little kids , i want a real girl :)

somaye

@GustavoBandeira what 's up?

Gustavo Bandeira

@somaye Not much. You?

I talked to you on yahoo yesterday.

somaye

@GustavoBandeira me too

@GustavoBandeira i was at work i could not be online

too much

Dominic Michaelis

15:53

I don't unterstand the logic, why do you come to a math side if you search "girls" for those "things"? Maybe a fetish site or the redlight district in your town will make a better job.

somaye

excuse me

Gustavo Bandeira

@somaye Relax. =)

somaye

@GustavoBandeira :)

Gustavo Bandeira

@somaye brb bath and shave.

somaye

@GustavoBandeira ok!

Dominic Michaelis

16:07

argh how can someone dealing with irrationality use degrees in sin math.stackexchange.com/q/396481/62278

Gustavo Bandeira

@mick Buy a compass. Follow east.

@somaye Back.

Dominic Michaelis

16:23

@Mick I bet if you ask a woman in a bar if she like fisting you will get a fist :D

somaye

@GustavoBandeira

i was not at room too

Jayesh Badwaik

@somaye Hi. Wassup?

mick

16:42

@GustavoBandeira why east ?

@DominicMichaelis Ill give it a try :)

my question :
http://math.stackexchange.com/questions/396456/when-is-it-justified-to-approximate-a-difference-equation-with-its-corresponding

anyone into answering ?

Gustavo Bandeira

17:03

@Charlie Charlie-Ethanized.

Charlie

@GustavoBandeira what?

Gustavo Bandeira

@Charlie Removing stuff. It's Ethan's Syndrome!

Argon

@charl es

user52523

Could someone help me with this problem math.stackexchange.com/questions/395561/compactness-property

Charlie

@GustavoBandeira yes. I do what I want to.

Gustavo Bandeira

17:13

@Charlie Yes. Everybody knows that.

Charlie

@GustavoBandeira good.

Gustavo Bandeira

@Charlie No good!

Charlie

@Argon haha ha

mick

17:34

@GustavoBandeira +1

@Charlie HI

Charlie

@mick hi

mick

Nobody wants to answer or look at my question ? Did is going crazy imho. He should chill.

Jayesh Badwaik

Erroneous quoting can make people really angry.

mick

Its was not a quote

I never said " quote : "

and i admitted it was not a quote in the comment

wantToLearn

can someone help here math.stackexchange.com/questions/395655/…

?

Will Jagy

17:48

@somaye hello

Charlie

@WillJagy hi William

Will Jagy

@Charlie good morning

Charlie

@WillJagy good afternoon

Will Jagy

@Charlie, if you say so. My first cuo of tea will be ready in another 2 minutes

Charlie

@WillJagy awesome

Will Jagy

17:53

1 minute

Charlie

@WillJagy oh my god

Will Jagy

@Charlie, no, I'm an ordinary mortal

Charlie

@WillJagy yes, we know

Will Jagy

Well, mortal but not entirely ordinary. I'm just saying

Transcript for

$Mathematics$ Mathematics