We love math, physics, chemistry and random talk.

Thats it!

Oh so it was the comment? Hehe!

6:09 PM

Now back to Math

YEs finally would that be

:D

Then we had matrices in question.

Q: Maximum of x+y with constraint

What question

0

What is the maximum value of $x+y$ given that $x^2-4xy+4y^2+\sqrt{3x}+\sqrt{3y}-6=0$? $x,y$ are real numbers.

optimization

But the questions were so long.

You guys are like doing our 11th in your 10th

dahell

6:11 PM

I think Iran calls 11th as 10 th ;)

Haha!

support faq comments comment-replies

94

Q: How do comments work?

Across the Stack Exchange network you may leave comments on a question or answer. How do comments work? Who can post comments? Who can edit comments? How can I format and link in comments? Who can delete comments? When should comments be deleted? What are automatic comments? How can I link to c...

Who knows, i find black magic in this.

@Mann I'm readying up my paper.

Q: Maximum of x+y with constraint

0

What is the maximum value of $x+y$ given that $x^2-4xy+4y^2+\sqrt{3x}+\sqrt{3y}-6=0$? $x,y$ are real numbers.

optimization

6:11 PM

@Mann The last para

@user223679 That's so long to read.

THIS

Too long indeed

I said last para -_-

Still long

I'm not a math nerd though guys. Not promising anything.

But if you had a chemistry Q, I'm ready!

6:12 PM

Do we look like math nerd. hehehehe

@Mann Whats long? The last para is 4 lines.

Anyhow, I got the idea. I think this optimisation problem requires to find $1+dy/dx=0$

easy i guess

One guy posted already the answer i guess nvm

You guys are classic!

I'm understanding it now.

My hunch was correct.

Some guys post answers were quickly...with all the mathjax

It's really hard to know which math Q is HW and which isn't, so you just say screw it and pass on.

6:16 PM

What hunch, and classic. I am again confused, this is MSE wild west gun. :D

We chem guys hate HW though.

That moment when the guy above me is just 1 point ahead of me.

in comments

Well, HW ain't bad.

@Mann Did you mean 1 rep point?

Yep

@M.A.Ramezani Thats bad!

6:19 PM

Ops not

1570, my eyes are betraying

A HW chem question looks like an imbecile trying to use you and get the hell of the answer outta ya, but a math Q, even when it's obvious that it's HW and its OP is a help vampire, looks like a delicious puzzle that asks solving.

@Mann Lol

@Mann You can get Unicoins for a better rep performance.

Whoa! You guys star fast!

That fact @M.A.Ramezani I laughed so hard

Its sad that there are 2 stars on your message and only two people in the room apart from you. No privacy :p

6:21 PM

Feels sad

Pets his back

Horribly horrible net.

@Mann You still dont use comment replies :(

But i already used it .-.

@Addy hi sneaky

any questions you guys got?

Let me grab my math book here.

I'll get better questions for you to solve.

Q: Predicting relative solubilites of salts without Ksp values

7

Is there a way of comparing which salt is more soluble without knowing their $ K_{sp}$ data or performing experiments? For example, comparing $\ce{Hg2Cl2}$ and $\ce{Cr2(SO4)3}$. I am not sure but can I compare lattice and hydration energy relatively or the ion size and estimate? Experim...

inorganic-chemistry solubility theoretical-chemistry

6:23 PM

THIS IS SPARTA

@Mann No. You did not use it. Where did you use it?

@user223679 Solubility in water?

I once used it for a comment

They don't mention it anywhere.

@Mann Once upon a time.

Actually it would be fun to kick-mute that lurker ;)

6:24 PM

@user223679 They can't talk in chat.

Chat talk needs 20 rep.

@Mann Use it more frequently then ;)

This is sadness

@M.A.Ramezani Ahh! Correct.

@M.A.Ramezani Yes

Youtube video incoming

MATH

@user223679 Then the poor guy has to stick to some shtoopid solubility 'rules'.

6:26 PM

Youtube video incoming

THIS NET

Since the other one has Hg in it, it's less soluble and that gibberish.

Lol. Both of tou upvoted my question. (the one I posted here). Hahaha

Wow this net

@user223679 Why you little!

@Mann Lets hope the video comes by 18th ;)

6:27 PM

The question was interesting

I hope if my net works

If you're up for some calculations, I have a Q for you. Be prepared.

> x + y = 13xy

@M.A.Ramezani Little? I am a year older :p

This is Sparta! Last techno remix

►

@user223679 That's a quote from Homer Simpson.

Indeed

6:29 PM

Anyway, I think I have to use multiline for my question or you guys are gonna interrupt.

A: Solve the functional equation $ \dfrac{f(x)}{f(y)}=f\left( \dfrac{x-y}{f(y)} \right) $

5

Let us define our variables as $x=x+h$ and $y=x$ , for convenience. Then our function equation becomes, $$\frac{f(x+h)}{f(x)}=f\left( \frac{h}{f(x)} \right)$$ With $h=0$ we can get that $f(0)=1$ but i have a feeling that $f(0)=1$ can not be the only case since we don't know what $f(x)$ is fo...

My life was accomplished here, my solution called beautiful :D

x+y=13xy and other equation?

> x+y=13xy
> x+z=14xz
> y+z=15yz
Calculate 1/x + 3/y + 4/z.

I smell matrices and it's inverse to rescue

OR just elimination

Lemme try lights off, so mental

@Mann Nah, that's my dinner burning.

Yes, i thought so. but it's never the less possible :D

6:32 PM

@Mann Did you post your answer over here just to get upvotes :p

Smell whatever you want. I DEMAND ANSWERS!

Not really :(

@Mann Downvoted your answer a minute ago.

This is not sparta

Btw, its a good answer. Standard JEE approach I guess. Saw it in some fiitjee material that I hooked from a friend.

6:34 PM

:O, i didn't know it was some jee type thing. lol

@M.A.Ramezani too lon

@M.A.Ramezani lol. you cant

g

I am doing however, mentally.

Divide and things,

AHAHHHHA!

Poor @Rohini comes and can't talk.

I can't my brain won't focus with all these message post smaller question

I think you guys can grant him access though.

6:36 PM

@RohiniSharma , not enough points? I guess , @M.A.Ramezani yes i guess. it's point problem

What was minimum limit?

20 rep.

Just go and upvote question could you, @M.A.Ramezani my votes are today's vote are exhausted

@user223679 you too

Link it! Do you think I dare scroll up?

I am an owner. Why am I not able to give special read access?

algebra-precalculus trigonometry

Rohini Sharma

13 4

There' 3 question would be enough.

6:38 PM

@user223679 You need to be of pure heart.

Q: equation having compex number

@user223679 this is sparta

and well math

-4

well! i want to know how can u solve the following two equations simultaenously in order to find out $x$ and $y$: $$ (3+4j)x-4jy=10$$ $$(2-4j)x +2jy=0$$ Please tell me the best methods to solve these two equations. How can i solve them with my scientific calculator??? Please tell me both ways: ...

complex-numbers

Poor guy, got some downvotes.

How long does it take for caching to finish? Rep wont update on chat till then.

@RohiniSharma can talk yet?

Nope. Server caching.

Ah i see, inferred well.

6:40 PM

He (?) should be able to now.

I think changes take effect after some time.

@M.A.Ramezani And thats caching

shouldiblamecaching.com

Or maybe was it really 20 rep/

@RohiniSharma rejoin i'd say the room

Why was that CN ques downvoted? Its not wrong.

Yes. but he added the bad word. "calculator"

And everybody calculated him out

6:42 PM

Lol

He deserved it IMO.

Q: Maximum of $x+y$ with constraint

This is sadness

@user223679 solve this for me

0

What is the maximum value of $x+y$ given that $x^2-4xy+4y^2+\sqrt{3x}+\sqrt{3y}-6=0$? $x,y$ are real numbers. Notice that it has terms $\sqrt{x}$ and $\sqrt{y}.$

optimization

Nah this is "We love math, physics, chemistry and random talk."

@Mann Aha!

Or just use lagrange multipliers as anu3fhui3 whoever suggested , ihave no light or notebook

But next time tell us why you post a link to a random question.

6:44 PM

It's fun to post questions :D

With especially nice-looking LaTeX code.

Akh!

@M.A.Ramezani His entropy change is always on the higher end.

too much randomness

The answer is wrong.

and trollness

Study LaTeX, and commit a crime of saying MathJaX = LaTeX.

6:45 PM

@Mann I downvoted it.

Entropy relation to disorder. INCORRECT

INCORRECTTTT rigorously

This is not spartaaa

Randomness relating to entropy is in the context of physics.

Entropy

In thermodynamics, entropy (usual symbol S) is a measure of the number of specific ways in which a thermodynamic system may be arranged, commonly understood as a measure of disorder. According to the second law of thermodynamics the entropy of an isolated system never decreases; such a system will spontaneously proceed towards thermodynamic equilibrium, the configuration with maximum entropy. Systems that are not isolated may decrease in entropy, provided they increase the entropy of their environment by at least that same amount. Since entropy is a state function, the change in the entropy of...

NININ

NONO\

Wait i will send you llink

entropysite.oxy.edu/entropy_isnot_disorder.html

Grabs popcorn

6:47 PM

This is sparta

entropysite.oxy.edu/entropy_isnot_disorder.html

@RohiniSharma, must be already weirded out to see all this.

@Mann You made the poor guy flee.

> IMPORTANT NOTE: The initial statement above (about the movement of molecules into a larger volume as solely due to their motional energy) is only valid as a description of entropy change to high school students or non-scientists when there will not be any further discussion of entropy.

@Mann I call it nonsense. It's all arbitrary.

:(, i didn't , my troll level is hard.

There he goes,

buh bye

It's like saying look is different from see.

6:49 PM

No it's not!!!

And I dont care about the actual definition etc etc anymore. Like @ADG, chem has less importance now. Unless I start liking it again.

ENTROPY IS NOT DISORDER

dx

xD

ALERT THE MEDIA: ENTROPY NOT DISORDER

dx is not d(x)

YESSS

they are very different :D

6:50 PM

Thats because I care for calculus.

d(x) could represent distance as a function of x

@M.A.Ramezani DISORDER IS me

Or it could be a d which is followed by (x).

@M.A.Ramezani Is that a good question for Chem.SE?

Doesn't really need to have a special meaning.

@user223679 Hmm...

Let me think.

Yes so many possibilites ,I wish my life had that many

No it won't be

6:53 PM

No it won't be.

They will say it depend upon personal opinion. :D

Cuz @Man just said.

And too many possible answer

@Mann BTW chem guys are really friendly.

Then they will upvote it to 1000 votes

-995

6:53 PM

They never close a Q wrongly.

If they do, there's that guy: Martin.

I never been to Chem tbh

You should be.

Or I'll...

I wish i could, but i suck at chemistry xD

@Mann Since you brought this entropy stuff up, Do you want to ask the question?

...recommend you to go there.

6:55 PM

Naa, I wouldn't dare too, they would possibly have that question already there

@Mann Then we're alike!

Martin likes football. Thats it. He is fun.

@Mann Entropy isn't disorder?

Who upvoted that, my question

I'll look.

6:56 PM

Does this have a meaning?

@user223679 You mean soccer?

@Mann Which?

answe

r\

18

A: does this have a meaning?

Define the function $f(y)=y$ $\;\;\;\;\;\;$ (1) We will use the first principle here, Let a small increment in $y$ correspond to $f(y+\Delta y)$ Then , $f(y+\Delta y)=y+\Delta y$ $\;\;\;\;\;\;\;$ (2) Subtract (1) from (2) $f(y+\Delta y)-f(y)=\Delta y$ Re-arranging. $\frac{f(y+\Delta y)-f...

@user football is usually American football.

@Mann No it doesn't.

Wow whaat, :O

But still, i wouldn't dare to ask haha

6:57 PM

Guys!

GUYS!

WHAT

Instead of posting random questions, why don't you add feeds?

Q: Assume that f is a one to one function: If $f(x) = x^5 + x^3 +x$ , find $f^{-1}(3)$ and $f(f^{-1}(2))$

0

If f(x) = x^5 + x^3 +x , find f^-1(3) and f(f^-1(2)) How do I go about solving this? For example, since I am giving f inverse should I = x^5 +x^3 + x = 3 ?

calculus

THIS ONE NOW

in The English Learning Cabin, May 15 at 9:35, by user223679

Whats the difference between: Football , American Football , Rugby , Soccer , American Soccer , European Football , European Soccer?

Was easy i guess

Whaat oo

Interesting

7:01 PM

@user223679 Then why did you wronged it up again?

Or maybe you like American football?

@M.A.Ramezani Only americans call it soccer. We call it football. We wont change it just because americans dont understand it. The whole world does. America is wierd sometimes.

But that would be :Oic.

I'd think i should go to sleep now. Lol

00:32

@user223679 That's proverbial

But yeah, US is superweird.

Q: Fourier transform of the Fourier transform

0

Is the Fourier transform of the Fourier transform of $f(t)$: $$\hat{\hat{f(t)}} = f(-t)$$ or $$\hat{\hat{f(t)}} = 2\pi f(-t)$$ ? I have read the two versions here and here (respectively) for example. And also, can I show this from the definition ? I tried this : $$ \hat{\hat{f(t)}} = \int_{-\...

fourier-analysis

OK sleep now

ccc

7:03 PM

FIFA

The Fédération Internationale de Football Association (FIFA /ˈfiːfə/; English: International Federation of Association Football) is the international governing body of association football (soccer), futsal and beach soccer. FIFA is responsible for the organisation of football's major international tournaments, notably the World Cup which commenced in 1930 and the Women's World Cup which commenced in 1991. FIFA was founded in 1904 to oversee international competition among the national associations of Belgium, Denmark, France, Germany, the Netherlands, Spain, Sweden and Switzerland. Headquartered...

@Mann Cya!

AFAIK, the rest of the world hate americans because they dont understand football.

@user223679 OK OK! I give up! Why do you Indian guys take everything so seriously?!

@user223679 That's only beginning to explain it.

@M.A.Ramezani I just take football seriously. Dont generalize it.