Mathematics - 2013-03-15 (page 3 of 5)

Argon

15:00

@JayeshBadwaik I know, I was just wondering if they were returned differently. Java has some weird things with returning and passing in things like arrays vs. primitive data types.

Jayesh Badwaik

@Argon Java is weird.

Argon

It is. I had to learn it for two semesters in school, +AP compsci.

Jayesh Badwaik

Poor Kid. I learnt C, then Assembly, then C++ and python/haskell. Best languages for education ever I say. And competitors includes natural languages like Hindi, Marathi, German etc etc except English. :P

Argon

I taught myself PHP years back.. That was lots of fun. :)

Tobias Kildetoft

@JayeshBadwaik The first language I actually got taught was SML

then assembly (they assumed you already knew C at this point)

Argon

15:05

Dynamic and weakly typed... so fun

Jayesh Badwaik

@TobiasKildetoft Its a cool language too. if I was two to three years older, I might have learned SML instead of haskell.

Tobias Kildetoft

As far as I know, the reason they used SML for that course was to make everyone start on an even footing (since it was unlikely that anyone would have done functional programming prior to starting uni)

Jayesh Badwaik

Yes.

Tobias Kildetoft

I also learned Java at the same time as assembly, but the focus was more on learning object oriented programming than on the language (the general philosophy was than once you know one language, most others are easy enough to pick up)

caveman

thats a good point of view to take

Jayesh Badwaik

15:09

That is very correct. I do not know anything about Java, but I can generally write good programs in it, by mapping my concepts from OOP to Java and watching out for differences.

Ethereal

@Jayesh Are you watching the match?! :O

Jayesh Badwaik

@Ethereal I watched, why?

anorton

Good grief! I walk into the chatroom, and people are bashing Java! :O Why don't you like it? :D

Jayesh Badwaik

@anorton No one is bashing Java! I just said once that it was weird.

anorton

oh. good. :) I like Java.

Tobias Kildetoft

15:14

@JayeshBadwaik btw, I recall an old entry on the daily wtf where someone was apparently so fond of Java (or maybe it was VB) that he had made a header file for C that defined a bunch of stuff, allowing him to write things like "if ... then ... end if" and "for ... do ... end do"

Jayesh Badwaik

@TobiasKildetoft FUUUUUU

I am not surprised though. I have seen similar projects by people.

anorton

159

A: What is the name of this operator: "-->"?

Utterly geek, but I will be using this: #define as ;while int main(int argc, char* argv[]) { int n = atoi(argv[1]); do printf("n is %d\n", n) as ( n --> 0); return 0; }

Look at the defs in that code

(just a short one, but really looks weird...

Jayesh Badwaik

Hahahahaha. Trolled!

Ethereal

@JayeshBadwaik They went not out throughout the day

anorton

Since there seems to be some programmers here... have you guys heard of Project Euler?

Jayesh Badwaik

15:17

@Ethereal Who went NO? I see 273/7.

Argon

@anorton Yup, I did a few

anorton

I find them pretty fun...

Ethereal

@JayeshBadwaik No, the Bihari Babuas vs. Jhansi Jhandus match.

Jayesh Badwaik

@anorton Yes. Cool it is.

anorton

I took about 6 months to do around 40, then I introduced my friend to the site, and he knocked out around 100 in a month.

Oh... and he's like a sophomore in high school.

(some people are crazy)

Jayesh Badwaik

15:19

@Ethereal FUUUU. I did not know Jhansi people were Jhandus.

Argon

sophomore = grade 11?

anorton

grade 10.

Jayesh Badwaik

@anorton some people are crazy, I am lazy.

anorton

He's in Algebra II (high school level)

Ethereal

@JayeshBadwaik You didn't watch the match?

Jayesh Badwaik

15:20

@Ethereal No, which match? I thought you were talking about Ind Aus?

Ethereal

@JayeshBadwaik No, Bihari Babuas vs. Jhansi Jhandus.

anorton

Maybe I should ask... what sport?

Jayesh Badwaik

@anorton Cricket.

anorton

:chirp: :chrip: :)

Jayesh Badwaik

@Ethereal No, no. I did not.

Ethereal

15:21

@JayeshBadwaik No, it's kho kho.

Jayesh Badwaik

@Ethereal Waaaait a minute. You say they went not out in kho kho for full nine minutes?

Ethereal

@JayeshBadwaik What? Almost everyone watched it. It was K-4 Kho Kho SC and ST match!

@JayeshBadwaik No, the whole day.

Jayesh Badwaik

@Ethereal I did not. I still do not know which teams are you talking about. I initially thought you were talking about University Cricket.

Ethereal

@JayeshBadwaik What, seriously? Don't lie... it's the North India World Cup -_-

Jayesh Badwaik

@Ethereal Erm, I live in Central India. :P (Actually, I do not have TV)

Ethereal

15:23

@JayeshBadwaik You live in India, and you watch foreign countries' matches? -.-

Jayesh Badwaik

@Ethereal since when Mohali is foreign? :P

Before you go... This is not an assignment joke. This is serious. Answer two simple questions, and you could spend A Day with Dravid. :P

Ethereal

@JayeshBadwaik As if I believe you.

Jayesh Badwaik

@Ethereal If you don't, I could get you suspended. ;-)

Ethereal

@JayeshBadwaik :-O

Dominic Michaelis

15:58

hi

user19161

@argon I just answered a fantastic integral question!

MSEoris

Hey if im told that $C^{2x2}$ is the complex vector space of 2x2 matrixes with complex entries, do I know if this v.s. is over the reals or complex?

Tobias Kildetoft

@MSEoris they will probably mean over the complex numbers

caveman

complex vector space

Dominic Michaelis

if it is the complex vector space i think they mean complex

MSEoris

16:09

thats what im guessing, but i cant know for sure can I..

Tobias Kildetoft

@MSEoris ahh, yes, since it says complex vector space, they indeed must mean over $\mathbb{C}$

Dominic Michaelis

why you care ?

MSEoris

I see. thanks for the clarification. I was trying to look at the basis to determine the rank of a transformation, and the two situations would have had differtn bases

user19161

Nobody appreciates my one line integration...

MSEoris

lets take a looksee

aww thats what i posted in the link in comments :)

Its the best method for sure

user19161

16:15

That is what I learned in my high school...

user19161

And yes, I did many of those integrals in high school.

MSEoris

I wish they made me do more integrals in high school

user19161

I wonder why one has 6 votes, one has 2 votes, and mine only 1 vote.

MSEoris

I only started learning methods now that i TA for calc 2

user19161

In my arrogant opinion, mine is the simplest solution.

MSEoris

16:18

but perhaps not for those who are new to those uglier trig functions

my students despise csc cot and sec

but they love sin cos tan

anorton

oops. I saw you say "my one line integration," and I thought you were saying that you had worked a line integral that no one appreciated....

I gave +1. That's the only way I knew how to do it...

user19161

OK, now it is 8, 3, 3.

user19161

Maybe they don't understand my one line solution.

anorton

Don't you just love the OP-> "Is there even a closed form for this integral?"

user19161

Well, that is a reasonable thing to say.

anorton

16:21

That is true... I guess it is still early in the semester for Calc II students...

I just thought that the integral of $sec x$ and $csc x$ were introduced sooner...

MSEoris

they are

my students did this maybe 45 days ago

its like the 2nd or 3rd topic in calc2 here

user19161

OK, Eric's answer has 9 votes, so I expect mine to have 10. =)))

user19161

I hope this question becomes the next hottest SE question!

user19161

@MSEoris You are a lecturer?

MSEoris

just a teaching assistant / tutor

Dominic Michaelis

16:24

@jasper such an easy question again

user19161

@DominicMichaelis Haha, but not every high school might do that.

user19161

It's really quite true that higher rep users get votes faster...

κρανίοπεριπολία

Obviously, they have a large fan base.

Arkamis

Skull -- did you see the news?

user19161

What happens when shit hits the fan?

Arkamis

16:33

nfl.com/news/story/0ap1000000150828/article/…

MSEoris

then theres a lot of shit to clean up :(

user19161

When BMS posts something, he gets 9000 votes immediately.

Dominic Michaelis

BMS?

user19161

Brian M Scott

MSEoris

he does have a nice quality of answers you cant deny

user19161

16:34

Yes, not denying that, but still, the rate is shocking.

Karl's students

@JasperLoy it will stick together to the propeller blade as long as the angular speed is relatively low.

MSEoris

well Bill dubique or whatever his name was would also post answers at a high rep, and i never saw him get votes like BMS

user19161

@Karl'sstudents Oh my ghost!

MSEoris

i think its part of how much the ocmmunity likse you

user19161

@MSEoris Oh, he is not too popular now.

MSEoris

16:35

indeed

Argon

@JasperLoy What question?

user19161

@Argon math.stackexchange.com/questions/331307/… here

Argon

@JasperLoy Ah! Very nice. I also commented with two solutions

user19161

@Argon Nothing compared to AIOTD.

Argon

@JasperLoy AIOTD? :)

user19161

16:40

@Argon Argon's Integral of the Day!!!

Argon

Hahahahaahahahahaahahahahahaha

user19161

Fun fun fun fun

Argon

I will post one that I made up... hmm..

Argon's Integral of the Day: $$\int_{0}^{\infty}\frac{x\,\log x\,\sinh(ax)}{\cosh^{2}(ax)}\, dx=\frac{\pi}{2a^{2}}\left(1+\log\left(\frac{4\pi^{3}}{a\Gamma^{\,4}\left(\frac{‌1}{4}\right)}\right)\right)$$

2

I think it works :)

user19161

@Argon I won't go back to the Eng room anymore, too many nasty remarks there...

κρανίοπεριπολία

@Arkamis No, I didn't. Thanks :-)

user19161

16:47

@Argon Jasper's integral of the day: $\int 1=x$, hahahaha.

Argon

@JasperLoy $+C$?

user19161

@Argon Well, understood, so suppressed.

Argon

Same with the $\text dx$, I presume :)

user19161

@Argon Yes, indeed.

caveman

17:15

@Argon, can you prov any new numbers irrational?

Argon

@caveman What do you mean?

Dominic Michaelis

@caveman to write the quotient field of an integral domain as a functor i use object function R -> quot(R) and for the morphism i take the injective ones right ?

Alexander Gruber

anybody know a good hangover cure

Jayesh Badwaik

grape juice or grapes

Dominic Michaelis

LOL

κρανίοπεριπολία

17:19

More sleep?

caveman

I dont understand

Dominic Michaelis

i read a good hangover curve :D

Arkamis

@AlexanderGruber Gatorade.

MSEoris

i dunno about grapes but a raw egg, shot of whatever you drank last night and hot sauce mixed in a glass works for me every morning

Arkamis

You need to get electrolytes in your system when you have a hangover.

MSEoris

17:20

eh if you cna stomach it, it works great

Arkamis

Gatorade works wonders.

Pickle brine will also work

Alexander Gruber

@Arkamis i do have some gatorade in my fridge ill try that

Arkamis

But drinking straight from a jar of pickles is way more nasty than some gatorade.

Argon

Electrolytes? Just drink saline!

Arkamis

Coconut water will also work

Jayesh Badwaik

17:21

@Arkamis But Gatorade is too much I think. I generally stay away from eletrolyte unless I have lost a lot of fluid.

Arkamis

But I'd rather drink pickle brine than coconut water.

MSEoris

id rather eat the raw egg

Jayesh Badwaik

@Arkamis I would do the opposite.

MSEoris

but im pretty manly

Arkamis

@JayeshBadwaik If you've drunk enough to have a hangover, you have lost fluid.

Alexander Gruber

17:23

goddamn teaching. i'd go back to bed but i have to introduce freakin $SL_n$ in an hour.

caveman

owww

Arkamis

"Class. Shhhhh, shhhh. Shhhhh. This is $SL_n$. If you have any questions, read your goddamn book and leave me alone."

2

caveman

lol

Jayesh Badwaik

@Arkamis I see. I have never suffered from serious hangovers then. Nothing that could not be washed off by a sugar+warm water+ pinch of salt. (a light version of ORT)

Arkamis

I played a game of hockey last weekend with an absolutely brutal hangover.

Alexander Gruber

17:27

@JayeshBadwaik that's a shame. you should probably fix that.

Dominic Michaelis

just say it itsnÄt relevant for the exam, they won'T listen at all

user19161

I am now the red square, yay!

κρανίοπεριπολία

You change colors faster than a mood ring :)

user19161

@κρανίοπεριπολία I am usually red on Ubuntu and blue on Debian.

Argon

@JasperLoy You just just become a rainbow square and be all colours in the visible light spectrum. QED

κρανίοπεριπολία

17:32

@Argon +1

like Bill Dubique

Jayesh Badwaik

@Argon he did become black

κρανίοπεριπολία

and white

Tobias Kildetoft

@AlexanderGruber did you see the paper about groups with triangle free prime graph on the arxiv today?

Alexander Gruber

@TobiasKildetoft no. can you link it to me?

Tobias Kildetoft

arxiv.org/abs/1303.3457

I thought it might be of interest to you

κρανίοπεριπολία

17:44

@JayeshBadwaik But it doesn't matter if you're black or white...

Tobias Kildetoft

though I only read the abstract

Alexander Gruber

@TobiasKildetoft hm. that is very interesting

@TobiasKildetoft but maybe i will have to write an editorial - his result is incorrect.

Tobias Kildetoft

it is?

caveman

that was fast!

Alexander Gruber

@TobiasKildetoft he states there can be no finite group with prime graph isomorphic to a $5$-cycle, but one can make one with semidirect products quite easily: $((C_{q_1}\times C_{q_2})\rtimes C_d)\rtimes(C_{p_1}\times C_{p_2})$

Karl's students

17:51

Is he Bill Gates in disguise? youtube.com/…

user19161

@caveman Do you look like the guy in your picture?

κρανίοπεριπολία

@Karl'sstudents funny :)

Karl's students

@κρανίοπεριπολία :-)

Tobias Kildetoft

@AlexanderGruber hmm, it is not obvious to me why that group has the correct character degrees for this

Alexander Gruber

@TobiasKildetoft oh! whoops, i see. i had not read closely and didn't realize this was the character degree graph

i thought it was prime graph of element orders

Tobias Kildetoft

17:55

yeah, I think it is unfortunate that he calls it the prime graph

as what he looks at is indeed usually called the character degree graph

Alexander Gruber

yeah, exactly. and "prime graph" is already used for something else.

that is a cool paper then. i will be sure to read it after my class.

caveman

good luck with your class

Alexander Gruber

@caveman thanks!

user19161

It seems that there are less votes on Friday afternoons.

user19161

I don't need any, just making an observation.

caveman

18:02

@DominicMichaelis, I didn't understand your question at all

something about field?

user19161

@caveman Which question?

Dominic Michaelis

i shall construct the quotient field of an integral domain as an functor

caveman

do you mean field of fractions

user19161

Same thing.

Dominic Michaelis

mac lane says quotient field i don't know the german word exactly but i guess fraction will do it

user19161

18:04

@DominicMichaelis I have Algebra by MacLane and Birkhoff.

caveman

what is the exercise number?

Dominic Michaelis

its the very first of the first chapter

caveman

oh

"the field of quotients of an integral domain"

Dominic Michaelis

oh sry

user19161

Yeah a fraction is a quotient.

caveman

18:07

there's a canonical inclusion from F to Frac(F), so you just need to find a way of extending a field homomorphism F -> F' to Frac(F) -> Frac(F')

Tobias Kildetoft

but quotient field can be misleading, as one might mean a field which is a quotient of the ring

caveman

then you have a commutative square

@TobiasKildetoft, thats what I was confused aboutit, couldn't tell which

Dominic Michaelis

i thought just taking the injective ring homomorphism on $F$

caveman

and since commutative squares compose that proves Frac is functorial

alternatively you could directly prove that $\text{id}_{Frac(F)} = Frac(\text{id}_F)$ and $Frac(f \circ g) = Fracf \circ Fracg$

@DominicMichaelis, yeah that injective ring homomorphism is what I was calling the canonical inclusion

and I don't know why I said field homomorphism earlier, that was wrong.. meant ring homomorphism

Dominic Michaelis

its pretty hard to show that stuff if you never heared of field of quotients before because you don't see the canonical stuff :(

caveman

18:11

no you invented it already

wait what bit is hard to show?

Dominic Michaelis

i meant i need a long time for it cause I first need to learn what the field of quotitents is

caveman

ah

well it's a very important thing to know, e.g $Frac(\mathbb Z) = \mathbb Q$

just think of $Frac(R)$ as pairs $(x,y) \in R^2$ which mean $x/y$

so $(x,y) = (z,w)$ means $x/y = z/w$ therefore it's defined as $xw = zy$

Dominic Michaelis

oh ok

caveman

and the canonical inclusion is just $r \mapsto (r,1)$, meaning change $x$ to $x/1$

Dominic Michaelis

thanks :)

user19161

18:20

Hey @Web_Designer!

user19161

Guys, I am now down to the last 500 points to reach godly powers, yay!

Dominic Michaelis

i need 14,275 points to godly powers :D

user19161

@DominicMichaelis You are already a German God!

Dominic Michaelis

:)

Tobias Kildetoft

@DominicMichaelis I have even further to go

user19161

18:29

@TobiasKildetoft Well, you will just win the Fields medal and laugh at all of us!

Tobias Kildetoft

If only more people would post interesting group theory questions that were not homework

user19161

Hey @Nimza I am red today!

Nimza

@JasperLoy Hey, I see, I'm shocked a little. Some time ago I was thinking that you're color invariant

There is only one conjecture now, about your shape-invariance

user19161

@Nimza Hehe, I put on Mr Bieber yesterday...

Ethan

Jasper I sent you an email

user19161

18:36

@Ethan And I asked to clarify.

Ethan

Yes just one

I think

I don't think I could handle 8 hours a day

Or if some overlap

user19161

@Ethan What's Finite Math about?

Ethan

registrar.ucla.edu/schedule/…

Be back in a sec

Going to Spanish class

user19161

@Ethan Can't find the description there lol.

Jayesh Badwaik

@JasperLoy See this

mainly combinatorics, a little introductory probability and matrices.

Charlie

18:51

Lock up your back door
Run for your life

The GIRL is back in town
Don't you mess me 'round

3

Dominic Michaelis

welcome back :)

Charlie

WOOHOO

user19161

@Ethan registrar.ucla.edu/catalog/catalog12-13-507.htm The descriptions are here. I think it is best to see what you like and can take from this page.

Charlie

@κρανίοπεριπολία HELLO

Dominic Michaelis

oh you are back in this chat great

Charlie

18:53

'Cause I'm back! Yes, I'm back!
Well, I'm back! Yes, I'm back!
Well, I'm back, back
Well, I'm back in black
Yes, I'm back in black!

3

user19161

@JayeshBadwaik I forwarded your mail to him.

Dominic Michaelis

oh great :)

Jayesh Badwaik

@JasperLoy Okay. thanks :-)

Charlie

@JasperLoy Hi Jasper

user19161

@Charlie Oh hi.

Charlie

18:56

@JasperLoy ;)

user19161

@Ethan It seems that if you want some combinatorics, then Finite Math or Intro to Discrete Structures is the class to go for.

Charlie

@JayeshBadwaik Jayesh, jayesh....

@DominicMichaelis ;)

Jayesh Badwaik

@Charlie Yes? Yes?

user19161

@Ethan OK, if you want the most combinatorics, I suggest you take Intro to Discret Structures. Good luck!

Charlie

@JayeshBadwaik nothing

Ethan

19:02

@jasperloy is that a graduate level class? Also do I need any pre-requisites

I can't navigate the page propperly

user19161

@Ethan Well, you should check out what is offered to you, I don't know what their arrangements are for you!

Ethan

Ok thanks

Jayesh Badwaik

@Ethan The course informally is not graduate math for sure though, and does not require any pre-reqs. Officially, I am not sure of the rules.

user19161

math.stackexchange.com/questions/178940/… When this gets reopened, I will vote to close it again.

user19161

math.stackexchange.com/questions/323334/… Also this has been reopened, and I can't vote to close it again, though I would if I could.

user19161

19:07

And closevoting a question is not a bad thing, don't hate me for it.

Carpediem

Hello

Can someone help me with this? math.stackexchange.com/questions/331449/…

Charlie

@κρανίοπεριπολία hi

@JasperLoy why?

Matt N.

2 out of 3 lamps broken. Does anyone have any knowledge of electronics?

κρανίοπεριπολία

@Charlie hi

Matt N.

I like 500 Watt light but apparently lamps built for that are no longer sold. At least not on amazon.

So I'll make one.

Charlie

19:19

@κρανίοπεριπολία surprise!

Matt N.

Just need to find out how.

Jayesh Badwaik

@MattN. Dude. Watt is just a measure of power consumed. You want candelas or lumens.

κρανίοπεριπολία

That is bright?

Matt N.

@JayeshBadwaik What are candelas? I thought the consumed power more or less directly corresponds to the brightness of the bulb.

Ah. Let me google that.

Aha!

Jayesh Badwaik

@MattN. Yes, but then, there are CFLs and other technologies which require much less power for same amount of light.

Matt N.

19:21

Oh dear. How do I find out the amount of candelas I need?

Dominic Michaelis

@matt if you take led you need a lot of less watt for the same amount of light

κρανίοπεριπολία

@Charlie Yes, I am :-D

Dominic Michaelis

my bicycle lamp does have 1400 lumen thats to much

Matt N.

@DominicMichaelis Excellent, thanks for the tip. But then why doesn't everyone use LEDs?

Charlie

@κρανίοπεριπολία ;)

Matt N.

19:21

Ah, I might not like the colour of LED.

@JayeshBadwaik I know that I know nothing : )

Jayesh Badwaik

@MattN. They are relatively new, hence, just recently have become somewhat cheaper.

Dominic Michaelis

cause it is a relative new technique the color is not the problem it is just expensive

Matt N.

@DominicMichaelis I wouldn't mind if it lasts long. I believe LED last forever.

Jayesh Badwaik

@MattN. Hehe, mainly bulbs will have the lumen rating given on them, that is what you should be looking for.

κρανίοπεριπολία

@Charlie Pleasantly ;)

Carpediem

19:23

0

Q: Scalar field property

Let $\textbf{a}=(a,b)$. Prove that there is no scalar field $f$ such that $\frac{\partial f}{\partial y}(a,b)>0$ for a fixed vector $\textbf{a}$ and every nonzero vector $y$. I need to give an example of such a scalar field for a fixed vector $y and every vector x.

multivariable-calculus

Matt N.

At the moment it's quite expensive cause every other month I need a new bulb.

Charlie

@κρανίοπεριπολία good :)

Jayesh Badwaik

@MattN. Pinch of salt. Depends on the quality. But yes, around 50% LEDs fail after 6 years or so. I have a study somewhere, let me look it up.

Dominic Michaelis

yeah LED last really long

anon

anyone familiar with the extension of isomorphisms bit?

Charlie

19:24

@JayeshBadwaik I have leds everywhere

Matt N.

@JayeshBadwaik Is lm short for Lumens? Then it's 9000 lm.

Dominic Michaelis

yeah lm is short for lumens

Jayesh Badwaik

@MattN. Yes lm is short for lumens.

Matt N.

@JayeshBadwaik If the bulb cost 50$ that would be cheaper than the bulbs we use cause they break so often. I am guessing it's caused by the fact that I put a 500W bulb into a max. 300 W lamp...

@JayeshBadwaik Aces, thanks. Now I know what I need to buy : )

You guys are awesome.

I'll buy an LED lamp.

Jayesh Badwaik

Good!

@MattN. Yes, that would certainly cause short lifetimes.

Charlie

19:27

@κρανίοπεριπολία We are...

Jayesh Badwaik

By the way, if you do want to look into detail in LED reliability, this is a good document

Charlie

@Argon YAY YOU

Matt N.

Wow. 201 Reviews and almost 5 stars out of 5.

Argon

@Charlie Nope, you

Charlie

@Argon :D

Argon

19:29

:D

Matt N.

@JayeshBadwaik Ah thanks.

@DominicMichaelis Wow thanks for the LED tip, it looks really awesome.

Dominic Michaelis

glad i could help :)

Matt N.

And it's only 36 pounds.

Jayesh Badwaik

:D Yes!

Matt N.

It claims "near daylight".

I'm getting too excited. It sounds too awesome to be true. : )

κρανίοπεριπολία

19:31

The autumn wind is a ***Raider***, Pillaging just for fun
He'll knock you 'round and upside down
And laugh when he's conquered and won

Charlie

@κρανίοπεριπολία ;)

κρανίοπεριπολία

just win baby

Matt N.

Ah, there's the catch: the lamp with the good review only corresponds to 150 Watts in regular bulbs.

(not sure why Lumen is not specified)

Jayesh Badwaik

@MattN. I was going to say but then I refrained: Near Daylight might be an exaggeration. Daylight is generally related to luminous intensity (candela), but due to the small angle of LEDs, the translation into lumen (which is candela multiplied by solid angle) may not be very impressive. But they will be powerful enough for almost all purposes.

κρανίοπεριπολία

Have you thought of using two lamps at once?

Matt N.

19:39

The 500 Watts Halogen feels close to daylight to me.

Charlie

The Autumn wind is a pirate
blustering in from sea with a
rollicking song he sweeps along swaggering boisterously

Matt N.

I will have to check out one of those LED lamps in a shop.

κρανίοπεριπολία

...just a suggestion...

Jayesh Badwaik

@MattN. It shows that power rating of the CFL is only 27W. There are available quite higher rating CFL which should do your job. I have some 55W CFL's here which are almost daylight for me. (Those 55W might correspdond to the 500W Halogen light.)

Matt N.

@JayeshBadwaik You are also a connaisseur of light? : )

Jayesh Badwaik

19:43

@MattN. I worked in a company for three months and designed a automated solar power based system for lighting up big buildings with LED lights. :-)

Matt N.

@JayeshBadwaik Wait. CFL is not LED, it's something yet different?

Jayesh Badwaik

@MattN. Yes. CFL and LEDs are different.

Matt N.

@JayeshBadwaik Haha, you are the man! : D I had no idea. What a coincidence.

Jayesh Badwaik

You will probably find using CFL much cheaper than LEDs at this point, however, they fail higher too, (but much lower than halogen things.) LED's are lightweight and ultra-low power but somewhat expensive even now.

Matt N.

@JayeshBadwaik There is one obscure electronics shop I know that basically sells anything you can think of. I'll go there and see if I can find some interesting lightware there : )

Jayesh Badwaik

19:46

Good. Yes, do that. :-)

Dominic Michaelis

leds are ultra bright regarding to the watt the consume

Charlie

...obscure....

Matt N.

@JayeshBadwaik But if it lasts for 6 years it would have to be pretty expensive to actually be more expensive than halogen in the long run.

Jayesh Badwaik

@MattN. CFL and LEDS are both lot cheaper than Halogen for sure.

Matt N.

@DominicMichaelis But they also only consume $\varepsilon$ Watts apparently : )

Jayesh Badwaik

19:47

@Charlie ... definitive....

Charlie bit me....

Matt N.

@JayeshBadwaik I like to save money in things that aren't basic to my needs : ) I can't work comfortably without my halogens : ) Like a druggy without their heroin.

Charlie

@JayeshBadwaik Yes I did

Matt N.

Will you now turn into a vampire?

Jayesh Badwaik

@MattN. Hehe. I understand. I am similarly addicted to my CFL lamps.

Matt N.

: )

Jayesh Badwaik

19:50

I am not sure, I cannot see my wound in the mirror as of now. Wait, even the skin has disappeared.

Charlie

@JayeshBadwaik how's your temperature?

Jayesh Badwaik

@Charlie -56K.

Dominic Michaelis

@charlie It's over 9000 !

Matt N.

I might be able to cure you from vampire, just need to apply some feng shui and astrology with a little bit of psychology and perhaps a pinch of cows' excrement...

Jayesh Badwaik

@MattN. Do not forget the burning the incense sticks.

Charlie

19:54

@JayeshBadwaik and your heart beats?

Matt N.

@JayeshBadwaik Ah true, thanks, I did indeed forget about the incense sticks.

Ok, thanks a lot! I'll see you all later!

Jayesh Badwaik

Later.

Transcript for

$Mathematics$ Mathematics