Mathematics - 2012-09-19 (page 5 of 5)

@PeterTamaroff Yeah, simply because a Fibonacci sequence is completely determined by the first two terms! One can use induction to prove of course. In fact any two linearly independent Fibonacci sequences will do.

Peter Tamaroff

@WillHunting Yes, I told you that!

math101

@robjohn Thankksssssssssss That was a big help :)

user19161

@PeterTamaroff Oh OK OK.

user19161

@math101 So many sssssssssssssssss

math101

10:25 PM

YA CUZ HE SAVED MY LIFE

user19161

@math101 OMG, that is TOO dramatic!

Jonas Teuwen

The Bro.

math101

That is profound @JonasTeuwen

Jonas Teuwen

That's just how I am.

user19161

@peter If we take say (1,0,0,0,0,0,...), (0,0,1,0,0,0,...),(0,0,0,0,1,0,...),... that is, ones at odd positions, it will span a proper subspace but still have countably infinite cardinality.

math101

10:29 PM

ohhh I remember that stuff from Linear algebra

user19161

Wow, Pedro generated so much math in me today...

Evan

"Sorry, your answer is not correct. Your answer: -4tan(x)+cot(x)+C Correct answer: 4tan(x)-cot(x)+C D:

user19161

@Evan Erm, where?

leo

hello

Evan

MyMathLab

math101

10:31 PM

Hello

Evan

It's usually pretty forgiving... usually...

Peter Tamaroff

@WillHunting Dude

See this

user19161

@PeterTamaroff Wow Pedro, I think you are on track for the Fields medal. Don't forget to acknowledge me then!

Peter Tamaroff

@WillHunting ¿?

user19161

@PeterTamaroff Nothing, I am just saying that I think you are making great progress in math!

Peter Tamaroff

10:35 PM

@WillHunting That seems more humble than a Fields medal!

John Junior

@WillHunting Do you have a Fields medal fetish?

user19161

@JohnJunior Maybe, I like to bestow its possibility on others!

John Junior

@WillHunting How about bestowing it on yourself?

user19161

@JohnJunior No, I don't think I will be in time for it, unless a miracle happens...

math101

Well as we said before Miracles do Happen

user19161

10:39 PM

@math101 Anyway, why did you choose the name 101?

John Junior

To those who have the courage to try.

math101

idk its a lame name

user19161

Hey by the way I wanna warn you guys about this series of books.

math101

its just reflects my personality

Peter Tamaroff

@WillHunting What's the warning?

user19161

10:40 PM

It's called Cram101 or something like that.

user19161

It has outline notes but there is no real material.

user19161

Just taking keywords and putting them into glossary style.

math101

cram101.com/hm.asp?c=&d=&a=&b=&u=

user19161

@reg Why are you here?

John Junior

@ЯegDwight Hi.

math101

10:41 PM

Thats stupid

ЯegDwight

@JohnJunior helloes.

I'm only here to check if you use any tags in your room description.

Trying to figure out what that all is about.

John Junior

@ЯegDwight Welcome

user19161

@ЯegDwight Oh, I thought you came to check on me.

John Junior

@WillHunting Not everything is about you.

user19161

As you can see @reg, I get 9000 stars here each day!

user19161

10:43 PM

@JohnJunior OK OK.

John Junior

$\Huge\text{Enough with the OK OK}$

user19161

@JohnJunior OK OK.

ЯegDwight

@WillHunting no, I don't want to interfere with your getting starred incessantly.

@JohnJunior thank you. I've been here before, though.

user19161

@ЯegDwight Anyway, it is your bed time, so I wish you good night!

ЯegDwight

Collected my share of stars for bashing physicists and vanished again.

@WillHunting true. Night all.

Ouvert et haut !

John Junior

10:46 PM

Not with your backwards "Я" though :)

user19161

@ЯegDwight Ouvert et haut !

user19161

You know what @JohnJunior I just put on chatjax and saw your HUGE words.

leo

@robjohn have you seen my last quesion

Evan

for the integral of 2sec^4(x), is 2tan(x)+(2/3)tan^3(x)+C an answer? wolframalpha isnt always great because of all the trig identities

robjohn

@Яeg welcome to the left side ;-)

ЯegDwight

10:48 PM

@JohnJunior true. But still with the same ID, 977. Which is all you should care about. Are you a mathematician or Charlotte Bronte?

@leo lemme look

@robjohn thanks man!

I'm outta here.

@robjohn is awesome

it's about the thing the las time here

Alex Becker

10:51 PM

@leo Thanks for editing your question to include your thoughts. It makes it much easier to answer.

John Junior

@WillHunting Did he just call me a female English novelist and poet?

user19161

@JohnJunior After that question of yours, I have decided to say minus three instead of negative three!

Evan

disregard, answered my own question

i really dont like the reduction formula. is it necessary?

Peter Tamaroff

@Evan Reduction formulas are Boss here!

Just use it a couple of times and profit!

leo

@AlexBecker I was writing the question in an old very slow computer and then I decide to swap to other computer, then I hit "Post your question" in order to save what I've typed. That was the first incomplete version

John Junior

10:54 PM

@WillHunting How you say it is your decision. Should I take being called a female English novelist and poet as a complement from the owner of the English Language and Usage room?

leo

hey @PeterTamaroff !

Peter Tamaroff

@leo Hey there.

user19161

@JohnJunior No, you should just take it as a joke. If your question is a serious one, then I think you lack humour.

John Junior

@WillHunting I was being sarcastic (!)

user19161

@JohnJunior OK OK!

leo

10:57 PM

@PeterTamaroff how goes the uniform continuity?

John Junior

@WillHunting Refer to above^

user19161

@JohnJunior Refer to above^

John Junior

13 mins ago, by John Junior

$\Huge\text{Enough with the OK OK}$

Peter Tamaroff

@leo Just fine. I have to worry about other stuff now, however. Midterms are getting close. sigh

user19161

@PeterTamaroff I am sure you will do well Pedro. But I think you need to think more yourself instead of ask questions so quickly.

Peter Tamaroff

10:58 PM

I'm doing some Linear Algebra now, but I should really be reviewing all my previous Chemistry lessons so far. KILL ME WITH FIRE.

John Junior

@WillHunting Refer to "start ChatJax."

Peter Tamaroff

@WillHunting Dude, I had already determined (just guessed actually) that $\dim \bf R^N=\aleph_0$ and that $\dim S =2$, I was just checking and sharing stuff =)

user19161

@PeterTamaroff OK, good good.

user19161

Junior says I must not say OK OK, so I will say good good.

math101

@WillHunting whats up with the repetition of words?

user19161

11:01 PM

@math101 Nothing, just a habit I got from the other room.

John Junior

lack of vocabulary?

user19161

It is a process called "reduplication".

Peter Tamaroff

@math101 Just personal ways of talking. When I say goodbye on the phone I say "Bye bye". It is inevitable, I don't know.

math101

@PeterTamaroff are you a math major?

Peter Tamaroff

@math101 What is a "math major"?

user19161

11:02 PM

@PeterTamaroff I usually just say bye to my friends on the phone.

John Junior

good good

user19161

@PeterTamaroff In American universities, a major is like an area of focus. One has majors and minors.

math101

Are you majoring in math?

user19161

Minors are not as major as majors.

user19161

One takes many modules to get a major in a subject, and fewer for a minor.

Peter Tamaroff

11:03 PM

@WillHunting Am I majoring in maths?

user19161

@PeterTamaroff You are going to aren't you?

math101

Y do people refer to math in plural

user19161

If mathematics is the main thing you study it is a major!

Peter Tamaroff

@WillHunting I guess! I'm getting a kind of MSc. on math I guess.

I'm not sure.

user19161

@math101 The full word is mathematics. Americans shorten it to math and British shorten it to maths.

leo

11:04 PM

@PeterTamaroff Last time you were negating the definition. From there you can get a sequential version of uniform continuity, namely: $f$ is uniformly continuous in $A$, if for all sequences $(y_n),\ (x_n)$ in $A$, $$\displaystyle{\lim_{n\to\infty}|x_n-y_n|=0\implies \lim_{n\to\infty}}|f(x_n)-f(y_n)|=0$$

user19161

@PeterTamaroff Ah, very good.

math101

@WillHunting ohhhhhhhhhhhhhhhhhhhhhhhhhh

Peter Tamaroff

@leo Noted!

math101

I am majoring in math at the moment but I may pull out

Not brilliant enough

user19161

@math101 OK, just don't pull out too late, same thing in you know what!

math101

11:06 PM

hahahaha

John Junior

Easier said than done

user19161

Now I wonder why people say hahahaha instead of ha @johnjunior!

math101

Well it was a continous laugh

Not a single chuckle

user19161

@JohnJunior So never use this method for it is not safe.

John Junior

@WillHunting What pulling out of math before it is too late?

user19161

11:09 PM

By the way I prefer to say math and not maths.

user19161

Maths sounds ugly.

math101

Well ya maths sounds weird

its sounds like advices

John Junior

There are many types of math so why not maths?

math101

Cuz thats improper english

John Junior

says who?

user19161

11:11 PM

Maths is proper in BrE.

math101

Well would u say sheeps or sheep?

user19161

But maths is because mathematics already ends in s.

John Junior

@math101 We are not talking about animals.

user19161

Bourbaki titled their book with "mathematique" to show the unity of math.

user19161

Their shouting at the top of their voices reminds me of how I did the same with my math friends in the canteen when we were arguing over a theorem.

math101

11:14 PM

I thought we were discussing grammar

Ok shower time for me

John Junior

@WillHunting Who?

math101

Bye guys

user19161

I am off to bed, good night boys and girls.

John Junior

later

math101

Ciao

user19161

11:14 PM

@JohnJunior Bourbaki.

J G

11:27 PM

Can I ask a quick math q?

I have the expression: $\begin{align}
\frac{d\ln(y)}{df} = \frac{dh}{da} \ \frac{da}{df} + \frac{dh}{ds} \ \frac{ds}{da} \ \frac{da}{df}
\end{align}$

Is the following correct: $\frac{\mathrm{d}\ln(y)}{\mathrm{d}f}/\frac{\mathrm{d}s}{\mathrm{d}f} = \frac{\mathrm{d}h}{\mathrm{d}s} + \frac{\mathrm{d}h}{\mathrm{d}a}/\frac{\mathrm{d}s}{\mathrm{d}a}$

J G

11:58 PM

Does my q make sense?

Transcript for

$Mathematics$ Mathematics