3:00 PM
1/1=1

$\frac{1}{1} = \frac{1}{1}$
:D

@DantheMan What is the reciprocal of -1.25?

$-\frac{1}{1.25}$

$-\frac{4}{5}$

3:05 PM
Yes or -0.8 :)

Ah. yes

The simplest name for its value.

-0.8 is the simplest name for the value of the reciprocal of -1.25, true?

yes

3:08 PM
it is :)

yippie

Now comes the tough question, are you ready?

Yes sir!

3:11 PM
What is the reciprocal of 0?

Anything but 0

:P
What is it?

I want you to tell me...

$\ge 1$

3:16 PM
It is good that you realize that the reciprocal of any number can not equal 0.

Aha...?

4 mins ago, by Dan the Man
Anything but 0
When you said this :)

Yeah
But what is the reciprocal of zero?

-1.25 times -0.8 = 1, this means -0.8 is the reciprocal of -1.25, right?

yeah

3:21 PM
19 mins ago, by John Junior
@DantheMan What is the reciprocal of -1.25?

...zero doesn't have a reciprocal?

@Matt Hi Matt

@JohnSenior Trying to cope with not seeing the teddy anymore.

@DantheMan $\Huge\text{BINGO!!!}$
1 min ago, by Dan the Man
...zero doesn't have a reciprocal?

3:22 PM
@Matt seems a sensible question to me

@JohnSenior Yep.

@DantheMan Very good :)

@Matt Its a shame he doesn't come here any more

@DantheMan 0 times any number is 0, not 1.

@JohnSenior I think it's good. This is indeed the black hole of productivity. I just don't see how to cope with it.
Silly, but he's quite special to me.

3:25 PM

Yes.

@JohnJunior Hah. Awesome. :D
@JohnJunior Right

@DantheMan Yes, it is :)
46 mins ago, by unNaturhal
Mmmmh.. with a derivative of a function (if it is a line), or a specific point of that function (if it is a curve). Or with this:
$$m = \frac{y_2 - y_1}{x_2 - x_1}$$
@unNaturhal Remember the denominator can never exactly equal 0.
1 hour ago, by unNaturhal
Could someone tell me what this:
$$\frac{f(b)-f(a)}{b-a}$$
Represents? Is it the angular coefficient of a line?

3:41 PM
See you later. I shouldn't be here.

Say... Are you, @JohnJunior related to @JohnSenior ?
3

@unNaturhal here b =/= a

@DantheMan nope - we are not related

Wow. haha

@DantheMan He is my mentor :)

3:42 PM
I Liked more OldJohn...

@JohnJunior Cool. How old are you guys, anyways?

hi @robjohn

Mean square!

@JohnJunior Hey there.. how's tricks?

@robjohn they are for kids silly rabbit :-D

3:44 PM
@DantheMan I am pretty old - see my profile
2

@GustavoBandeira are you there?
@JohnSenior Come on....You are not old!

@JohnSenior What is pretty old is all relative.

@robjohn Exactly

@MeAndMath well, I have retired, I get a pension, and I‌ have a senior-citizen railcard :)

It does not mean anything.

3:47 PM
@JohnSenior Where are you from?

@DantheMan North West UK

I imagine John senior speaking with accent :)

@MeAndMath I definitely do not have a Liverpool accent :)

@JohnSenior Nice!
@JohnSenior Haha

@JohnSenior What do they call the Royal accent?

3:50 PM
@JohnJunior No idea! - but possibly "BBC English"

@JohnJunior Yeah thanks, I know :)

Ah... BBC. I used to watch a good show by them.

@JohnSenior Is it close to any particular region's accent?

@JohnJunior the BBC accent? - or mine?

BBC
ie Royal Family

3:52 PM
I guess it is closest to the accent of SE UK

Fascinating!This accent differences!

user19161
@JohnSenior Now SE has a UK cousin!

@WillHunting True!

In my country, each state has an accent.

user19161
@MeAndMath Space after comma.

3:54 PM
@MeAndMath some counties in the UK have a distinctive accent

user19161
@MeAndMath Space after exclamation mark.

we have counties rather than states

@WillHunting Anon told me these things , but I always forget it ...

user19161
@JohnSenior We have towns rather than counties!

@MeAndMath In my country, each state has a different language. And within the state, each district has a different dialect and god knows about the accents. :P
2

user19161
3:56 PM
@MeAndMath No space before the comma or ellipsis.

@WillHunting this is getting annoying...

user19161
@MeAndMath I wanted to say no space before the exclamation mark either, but I better not annoy you anymore.

@WillHunting You can correct me always when you want, until I do it right.

user19161
@MeAndMath Nah, it's more for the lolz.

Punctuation is not a big issue here :-D

user19161
4:00 PM
Wrong punctuation makes you punctured.

I think too much spaces is a waste of space...

Only if you're full of hot air.

Hence I was wondering why a panda comes here, eats, shoots and leaves. :P

panda?

yeah, what panda?

4:03 PM
google "panda, eats shoots and leaves"

Eats, Shoots & Leaves: The Zero Tolerance Approach to Punctuation is a non-fiction book written by Lynne Truss,

@JayeshBadwaik "Eats Shoots and Leaves" is a great book - Will would like it

Great!
there are things like that in portuguese, too.

user19161
@JohnSenior I have Larry Trask's Guide to Punctuation. I consider it a masterpiece of British punctuation.

user19161
It is interesting that both their initials are LT.

4:06 PM
@WillHunting The book by Lynne Truss is more hilarious than educational
they might be the same person in reality :)

user19161
I also have the Cambridge Grammar of English, not to be confused with the Cambridge Grammar of the English Language.

Oh I confuse them all the time :P

@WillHunting You are serious about getting your use of language correct, then. :)

user19161
Also, do not confuse the Oxford English Dictionary with the Oxford Dictionary of English.

This is serious...

user19161
4:08 PM
And don't confuse the compact version of the OED to the Compact OED.

I used to do this in my language, but people usually don't give a shit... and look to me like I was an ET... then I don't care anymore...

user19161

@WillHunting Portuguese.

user19161
@MeAndMath Ah, do Carmo!

@WillHunting Yes.

user19161
4:13 PM
@MeAndMath By the way, I think do Carmo's DG is too long.

@WillHunting Good to know.
portuguese is a very beautiful language.

user19161
@MeAndMath All I know about Portugese is that like Spanish it is used in SA.

@WillHunting Portuguese is not like spanish...
If you speak portuguese , you can understand a little spanish, french, latin.

@MeAndMath Does it work the other way? - If I know Latin, would I understand some Portugese?

A little.
Italian, too. I can understand italian and never learned it.

4:21 PM
I can just about get by in Italian - but Portugese always sounds a bit more alien to me :)

la matematica è molto buona (italian)
matemática é muito bom. (portuguese)
@JohnSenior Start learning ! it's really cool!

@MeAndMath No time - I am currently learning Persian ... and maths :)

user19161
@JohnSenior May I ask why Persian?

@JohnSenior Interesting.

@WillHunting I have quite a few Iranian friends and wanted to understand a bit more about their language, culture and literature

4:24 PM
@JohnSenior Do you like Rod Stewart's music?

@MeAndMath Vô ver a namorada. =)

@JayeshBadwaik not a lot - I listen almost exclusively to classical music - and a bit of middle-eastern stuff

@GustavoBandeira OK.

@JohnSenior Okay.

4:37 PM
@NickKidman hi

favorite chemical element?

Technitium

not sure if that's a real one

Yours?
I must be wrong in spelling. But I am approximately correct.

mine is probably H

4:40 PM
@NickKidman :)

@NickKidman you must be a physicist.

I am :)

Carbon rocks, too.

@MeAndMath Eu acho que eu tava dormindo quando cê falou comigo. Vô indo na aula de piano agora, cya.

@GustavoBandeira you have got piano lessons?
I think I deduced that much from the stuff.
If I am right, yay for me!

4:42 PM
@GustavoBandeira OK, again.

do you have girls on the site?

user19161
Plenty.

@NickKidman Well, as a physicist in me, hydrogen atom is of course a good thing to be passionate about.

I'd be tempted to say "the best element is no element"
fuck chemistry
3

Just making my favourite Jamie Oliver risotto recipe. A masterpiece.

4:44 PM
make a photo

@Matt awesome.

@NickKidman Still in pan!

user19161
@Matt I see his cookbooks everywhere.

@NickKidman Condensed matter? Theoretical? HEP? etc...

@WillHunting I think he's quite awesome.

user19161
4:46 PM
@Matt Yes. Are you having hols now?

@NickKidman Who has girls?

@WillHunting What are hols?

user19161
@Matt I mean holidays, vacation.

@MeAndMath: The math SE site

@WillHunting Quite the opposite. I've got 6 days to write 15 pages (the better half) of my BSc's thesis.
Not very likely that I'll make it.

4:48 PM

@NickKidman I am.

@NickKidman Ahh. and so the angst. I see.

http://www.youtube.com/watch?v=chPanW0QWhA robots are faster than humans now
@MeAndMath: >that beard

@NickKidman My gravatar? it's charlie chaplin.I'm a fan.

4:50 PM
Requested evidence:

relating to robots, this http://www.youtube.com/watch?v=4ErEBkj_3PY#t=10m25s is also recommended

@Matt nice.

@t.b. Look what you're missing out on^

@NickKidman O.O

4:57 PM
That is something!!!
@NickKidman Amazing!

and lastly
I always have a hard time understanding the appeal of number theory, can someone give me insight?

:o
@NickKidman Are you a physicist?

@NickKidman I think the appeal of number theory is that it mostly deals with properties of positive whole numbers - they are amongst the simplest of mathematical objects and yet they lead to some problems which are really easy to state and incredibly hard to prove

@MeAndMath: Yeah, that was established above

5:12 PM
@NickKidman I think it must be called an "hydrogen-affinity physicist detection test" :P

@NickKidman Nice!

@NickKidman About the appeal of number theory, I would like to say, that a mathematician likes to looks for patterns around him, as most of other people also. Most of the things, of which patterns are to be found are given to us by nature. They are quiet complicated, but arising from simple interactions.
In contrast, number theory is very simple, in the sense that it is pure numbers, there is no reason why numbers are created and destroyed. And to have patterns in something as simple as number is very fascinating.
This is like finding that a closed superconducting ring has a quantized magnetic field.
And hence, demonstrating quantum mechanics, or so can be said.
There is some awesome quote by gauss about prime numbers which I cannot find right now. He expresses it very well .

must go cook - back later

@JohnSenior squawk
See you later : )

later
@JayeshBadwaik Mathematics is the queen of the sciences and number theory is the queen of mathematics.

5:24 PM
@JohnJunior No, not that one. There was some quote about the invariance of existence of primes.
Whatever base you take, whatever system of arithmetic you take, your prime numbers remain the same, or something to that effect. Then Gauss says that it seems as if the existence of the prime numbers is a law of universe itself.

@NickKidman Thanks for all the cool video links :-D

@JayeshBadwaik I find it hard to imagine any kind of intelligent life form that would not have prime numbers in exactly the way we do (with a totally alien notation of course), but I might not expect them to have other branches of maths as we do
I agree with Gauss about most things:)

5:40 PM

hairstyle

@NickKidman Stop trolling. You're a Physicist in a math room not a Mathematician in the physics room :-D

is it possible to get a set which every two elements could be compared, say =, <, >, one of three and only one happens, but without transitivity ?

@JohnJunior ;)

@JohnJunior I disagree with Gauss's choice of representation for binary quadratic forms in Dis. Arith. - and one or two other things

5:45 PM
@JohnSenior TO THE BONFIRE!

@PeterTamaroff what??

@PeterTamaroff We don't burn witches anymore.

@JohnSenior You should ask Joan of Arc

@PeterTamaroff So I am not allowed to criticise Gauss? :P

Let = denote equality as usual on a set $S$, and let $R\subseteq S\times S$ be any subset that has trivial intersection with $Eq\subseteq S\times S$ (meaning $\{(s,s):s\in S\}$). Then let $Q=S\times S\setminus(R\cup Eq)$. You now have three mutually exclusive collectively exhaustive binary relations on $S$.

5:48 PM
He also had some annoying traits about not publishing stuff that might have helped the rest of the mathematical world

Wow, I wrote "now have" as "know how." hmm..

@JohnSenior It depends. Do you have a salamander cape?

@PeterTamaroff I doubt it - but I don't know what one is :)

@PeterTamaroff Did you find out about : and |?

Wait, you have to account for intransitivity.

user19161
5:50 PM
We have to account for all our actions.

user19161
What is "Raiders"?

@PeterTamaroff Hello!!!

@WillHunting It is a way of life.

@MeAndMath Hey

user19161
5:54 PM
@NickKidman I hate number theory as well.

@WillHunting I hate you.

user19161
@PeterTamaroff I LOVE YOU.

@WillHunting Well, that's a problem right there.

How cutie!

5:55 PM
@JohnSenior Maybe there is an alternative viewpoint that no one has found because we have become so culturally attached to the house that Gauss built.

Later! Got to stuff some risotto into my face : )

user19161
Next thing Peter will say is "Are you trolling me?"

No I will say it ;-)
Are you?

by the way, since we almost don't have lectures for 2-3 months from Nov., is it good to audit something like Functional Analysis, transform theory..., even if only get through calculus-analysis-algebra or so. Because we'll have too much free time at that moment and unfortunately not many other courses opened.

user19161
5:58 PM

user19161
@XingdongZuo If the lecturer is really good though you should consider attending.

@MeAndMath I did find you in FB, but there are no pictures!
@NickKidman I think $\exists !$ is used for "exactly one "

@PeterTamaroff I'm shy...

user19161
@MeAndMath Hehe.

@PeterTamaroff: Ya, I'm also used to that. But whatever, I didn't write it

user19161
6:04 PM
@PeterTamaroff The exclamation mark means "unique" to me.

@WillHunting Oh, yes.

user19161
@PeterTamaroff But really, in writing ordinary mathematics (as opposed to logic texts) one should avoid the use of these symbols.

user19161

@WillHunting ORLY?
@MeAndMath But why?

Recently, at starbucks, I've given them the Name Galois for my drinks. [ i.imgur.com/o192D.jpg](http://i.imgur.com/o192D.jpg). "What? Like the cigarette brand?"

6:05 PM

user19161
@PeterTamaroff Just say things like "there is", "for all" etc. You don't see these symbols in proofs do you?

I don't like taking pictures...

I just figured out that "conservative extension" is a technical term...

user19161
@MeAndMath Same here.

user19161
But I still owe Peter a pic this year.

6:08 PM
@WillHunting Is us $\forall$ when I'm lazy!

A friend wanted me to post...said that my pictures is not bad...but I don't know...
@PeterTamaroff looking your photo, is quite close to what I had in mind.

@PeterTamaroff yep.

@MeAndMath Don't show it to @WillHunting !!!

6:46 PM
Where are the transﬁnite ordinal numbers in the hierachy? What numbers are directly above and below?

Don't want to call people in
afk

What is the hierarchy?

@anon Who shits on who. Who sits up above one another.

mm, von neumann it seems

6:56 PM
@anon Hehehehe

@PeterTamaroff $(-1,0,3)\times (-1,2,0)$, I get $(-6,3,-2)$ with the vertical pen -method although I should get $-(6,3,2)$, ideas?
err I found the mistake, I got the right answer, yes pen -rule works but you need to be careful with (-1) (-1) (-1)

@hhh OK DOKEY

@hhh The product of an odd number of negative numbers is negative.

7:12 PM
@JohnJunior That's why people hang out in pairs!
Or not...

@PeterTamaroff The product of an even number of negative numbers is positive :)

@JayeshBadwaik Yep, I have piano lessons,.

@GustavoBandeira Have you studied music for long?

@JohnJunior I started making music with 15, but I'm having formal lessons for ~2 years.

7:28 PM
oh,damn it...

@MeAndMath Whine who!

@PeterTamaroff YAY!!!!!!!
internet goes down..no one knows why...

I once heard a saying about music that went like:
The words in a song make you think, while the tune makes you feel. Together listening to music makes you think about how you feel. How true do you think that saying is?

@MeAndMath Why are you cheering?

@PeterTamaroff I don't know...
I want rain!
and painkillers...

7:32 PM
@MeAndMath Oh dear, why?

@JohnJunior I don't like voice in music very much. But I also think when I hear the tune - the cool part is to perceive patterns on it.

@PeterTamaroff It's been a long that it doesn't rain here.I can't breathe correctly...I have allergy...
And the painkillers for my back and head...

@MeAndMath You're a trainwreck!

@GustavoBandeira In any case: how can we ever explain the fact that music "touches" us and generates "feelings" that can touch our entire body and make us shiver?

@PeterTamaroff oh!

7:36 PM
@JohnJunior Magnets should do the work there.

I guess it has something to do with cultural conditioning: We played n patterns of sounds on n events - we associated these patterns with feelings, supose that on mariages, people play this patterns:
0--0----0--0--0----0--0--0----0

While on death, people play this:
0-0-0-0-0-0-0-----0-0-----0-0

@PeterTamaroff how is the weather there?

@MeAndMath Ugly as hell.

@PeterTamaroff why?

This also may have several consequences for the future - maybe in the future - considering the diversity of different musical languanges that is being made, we're going to have a bigger variety of feelings.

7:39 PM
@MeAndMath The sky is grey and it is raining. It is cold and everyone has the flu.

@PeterTamaroff Oh!I like that weather!

@MeAndMath You're probaby on uppers all day then!

I'm not a normal brazilian:don't like beach,sunny days,coffee,samba,parties,carnaval...

Or have $\aleph_0$ amount of coffee!

@PeterTamaroff My grandma lived there for a while.

7:41 PM
@MeAndMath Well, I don't like football. dramatic music plays

@MeAndMath We're on a math forum/chat - It's obvious we're weird. =D
3

@PeterTamaroff I HATE football,soccer,sports in general...

@MeAndMath But why!?
@GustavoBandeira Well, you're a killer. I can tell by the picture.

@PeterTamaroff It's traumatic...it excludes people...

@MeAndMath I'm a tennis teacher. Tennis is awesome.

7:42 PM
@PeterTamaroff I like individuals sports.a little.

@JohnJunior There's a book you could buy: questia.com/library/1222019/…
@MeAndMath Everything that imply in cooperation excludes the noobs.

@GustavoBandeira Thanks

@GustavoBandeira na escola eu ajudava os caras a passar mas ninguém nunca me ajudou nos esportes...

@MeAndMath Yep. É por isso que não se ajuda idiota de graça. =)

7:45 PM
yes...

@GustavoBandeira NO PROTGUESIAN HERE!

Se a pessoa demonstrar pelo menos um pouco de autruísmo para com você, tudo bem.
@PeterTamaroff PROTUGEUSIAN!!!!!!
PROTOPLATAFORM!

@GustavoBandeira PORTUGUESULIAN

@PeterTamaroff perdón!

@PeterTamaroff PORTUGKUNG-FU!

7:47 PM
no hablemos más en portugués

Look this one too:
http://archive.org/details/musicthroughthea010450mbp

@GustavoBandeira Great

@JohnJunior What do you feel towards this music?
@JohnJunior It's strange to know that someday in the past, we felt the same towards the music we hear today.

7:50 PM
@GustavoBandeira scheisse...

@GustavoBandeira Listen to Debussy!!!

@PeterTamaroff DEbussy is beautiful!
A few nights ago,the moon was incredibly beautiful!!!His song came to mind and brought tears to my eyes!

@MeAndMath I haven't seen pictures of him. Is he?

@PeterTamaroff metonymy...

@MeAndMath Say what?

7:54 PM
@PeterTamaroff I mean his work.

@PeterTamaroff I hear debussy.
We had an Albeníz-Debussy festival last month.

but he was devoid of beauty

"How else is art to grow if it only continues to use the same mediums and conventions? May I ask what kind of music you enjoy? It is with all possibility that it﻿ wouldn't exist without some people doing something that is considered "weird" by most people, therefore "breaking the norm.""

@GustavoBandeira sweet!