Calvin's Chat Room - 2020-08-11

2:07 AM

@sai-kartik the hollow sphere is obtained by removing mass from the solid sphere

@CaptainBohemian 1 so-so; 2 yes, that's the time i'm used to sleeping; 3 same as 2; 4no, i don't have feelings when i'm asleep; 5 yes, i just toss it all into a machine, it takes the longest to fold but oh well 6 no, i'm asleep after midnight

Captain Bohemian

2:39 AM

I can still feel after falling asleep.

Calvin Khor

i'm simply not conscious during sleep, and consciousness is a prerequisite for feelings

Captain Bohemian

I often wake up thinking of something different from yesterday.

Specter Prophet

5:13 AM

(removed)

lol u removed ur removed

Calvin Khor

$\color{gray}{\textsf{(removed)}}$

Specter Prophet

never knew u can adjust color in latex

does it work with Rgb value?

Calvin Khor

$\color{white}{\textsf{(who's rob?)}}$

29

Q: Color RGB in LaTeX

Please, I'd like to use the blue color RGB (0,32,96) in LaTeX. How can I do this? I find this on the web: \definecolor{ultramarine}{rgb}{0.07, 0.04, 0.56} But it is not the right color I search.

color

Specter Prophet

in my browser mathjax won't work so it won't show me white ( ͡° ͜ʖ ͡°)

Calvin Khor

lol

Specter Prophet

5:30 AM

@CalvinKhor looks like doesn't work in stack exchange but in ur own latex ide

u need to import modules

Specter Prophet

5:43 AM

I know the reason why CaptainBohemian lives in a bathroom

as archimedes he is waiting for a eureka moment

sai-kartik

6:37 AM

@CalvinKhor eye strain 100

Specter Prophet

7:23 AM

en.m.wikipedia.org/wiki/…

wierd integral

satan is watching i need to go to bed to hide

Captain Bohemian

7:40 AM

I just saw a tablet 260mm x158mm x11mm costing only 3690 dollars.

satan 29

7:52 AM

@SpecterProphet :)

Captain Bohemian

sigh

Calvin Khor

does it have a pen thing?

@CalvinKhor Hola!

@Knight ¡Hola!

How’d you doing?

8:03 AM

@CalvinKhor no, but my phone, which I bought in Feb. also doesn't have a pen.

Calvin Khor

'How do you do', or 'How are you doing', but not 'How do you doing'

Captain Bohemian

so hungry

Knight

@CalvinKhor How do you doing is correct and is widely used in NA

Captain Bohemian

if I sleep for really long enough, when I get up, I have felt very hungry.

Knight

It’s native :-)

Calvin Khor

8:04 AM

@Knight No. 'How you doing', or rather, if typed formally, 'How're you doing'

but never 'how do you doing'

Captain Bohemian

then I can't work once upon I get up.

but if I sleep for shorter, I get up not so hungry and feeling still sleepy.

Knight

@CalvinKhor It’s widely used and accepted

Captain Bohemian

how do you solve the ambivalence?

Knight

How can give you a proof of that? Come here and we will talk like that

Calvin Khor

Check number of occurrences on google

Knight

8:08 AM

You can find anything on google, sometimes they say excessively drinking water is injurious to health sometimes they say drinking too much water is very good for health

I don’t trust if a google search says “Don’t say “How’d you doing” “

Captain Bohemian

water taste so boring that I wouldn't drink it unless I really need it.

Knight

I wound rather stick to the accents and slangs of normal Chicago gun sellers :)

And I haven’t come here for that

I want to prove an inequality

Calvin Khor

I didn't ask you to trust if there existed one person who said it

I asked you to check how many people said "How do you doing"

or if you prefer "How'd you doing"

Knight

Everyone says it Cal

Calvin Khor

About 536,000 results for "How'd you doing"

Knight

8:14 AM

Can you see the inequality I posted in Mathematics room?

Calvin Khor

About 22,700,000 results for "How do you doing", many of the top ones are saying that this is a wrong sentence

wanna guess how many for "How are you doing"?

@Knight I'll check

Knight

@CalvinKhor Matter is not what is wrong or right. Language is all about what the majority uses.

Calvin Khor

The "majority" is precisely why I am talking about the number of search results

Knight

My majority isn’t the same as yours

Calvin Khor

hm idk how to do AM-GM questions

your majority would be failed by their english teachers

in Mathematics, 1 hour ago, by Knight

@robjohn I have to prove this inequality
$$
xyz \gt (y+z-x) ~(x+z -y) ~(x+y -z)
$$

in Mathematics, 1 hour ago, by Knight

$$
y+ z \gt 2 \sqrt{yz} \\
x+z \gt 2 \sqrt{xz} \\
x+y \gt 2 \sqrt{xy}
$$
But I need x, y and z all together.

Knight

8:18 AM

@CalvinKhor Not quite

Calvin Khor

Sure, failing is harsh for one mistake. I'll give you that.

Knight

Do you know what “Y’ll” mean?

Y’ll

Calvin Khor

Y'all

you all

more texan than chicago, no?

Knight

No! That’s what the people from South mean

English and Asians mean you will by that

Now, please don’t let a google search support your claims

Calvin Khor

"English and Asians"?

if you put "English" in the same category as "Asians", you must mean people from England?

I spent about a third of my life in England and I've never seen Y'll

Knight

8:25 AM

I meant it

English = People from England

Captain Bohemian

@SpecterProphet l think money really shouldn't be donated arbitrarily. People far wealthier than you are abound. Delegate them to donate.

Calvin Khor

Not a single instance of "How'd you doing" or "How do you doing" found in a book

Specter Prophet

@CalvinKhor holy molly

Calvin Khor

I'm not going to bother with Y'll. I won't try to change what you think is correct, but it is definitely a minority opinion

books.google.com/ngrams/…

Specter Prophet

@CaptainBohemian U can entertain with ur physics tricks

Knight

8:27 AM

But that’s my majority

Specter Prophet

in order for them to donate u

Captain Bohemian

@SpecterProphet further, that man on bus asked money from me for paying bus ticket. I think he doesn't really need to do that; he can just ask the bus driver to exempt from the bus ticket.

Knight

Can you help me with that inequality?

Calvin Khor

@Knight you're not talking to "your majority" at the moment. The bubble you're in looks kinda odd to me from where I'm standing

11 mins ago, by Calvin Khor

hm idk how to do AM-GM questions

@Knight ^

Specter Prophet

@CaptainBohemian who in the shameless arsehole will do that shame on him

but question is how dare he to join the bus without money lol

Calvin Khor

8:30 AM

I once tried to pay for an old man to get on the bus when I was rushing but he ignored me and took his time lol

Captain Bohemian

@SpecterProphet He was basically a hobo.

Specter Prophet

I forgot this symbol lol "~"

in math

this is hobo

Calvin Khor

@SpecterProphet \sim $\sim$

Specter Prophet

@CalvinKhor nono I mean wut is the meaning of this

I have deal it in proof and real analysis

Calvin Khor

Depends on context

Specter Prophet

8:32 AM

is it relation

Knight

I have to leave now

Calvin Khor

@Knight ok, cya. sorry i can't help

Knight

I got things to complete

Calvin Khor

@Knight glhf

Knight

@CalvinKhor No problem :-)

Captain Bohemian

8:33 AM

i get hunger t solve.

Calvin Khor

@Knight sometimes 'ya is pronounced with a sort of 'j' sound. I can only imagine that you are trying to type this

Captain Bohemian

how long will a tablet persist without charging?

Calvin Khor

@CaptainBohemian that sort of specific detail depends heavily on which tablet

@SpecterProphet i was gonna type something but gimme a moment

Specter Prophet

depends on how much energy it has and how much u spend time using it

@CalvinKhor k

Calvin Khor

2

A: $\sim$ symbol in asymptotic analysis

I found the notation you're asking for. From this and the various other known interpretations*, it should be clear that "the actual meaning of the $\sim$ symbol", even when dealing with asymptotic results, does not exist. Rather, like many notations, it is a convention that depends on the author....

Specter Prophet

8:39 AM

@CalvinKhor holy u got 50 bounty 👏👏👏👏👏

Calvin Khor

@SpecterProphet yes, this also. And what you want to do also. Watching movies = use a lot of battery

Captain Bohemian

@CalvinKhor 影片播放(720P, 亮度50%, 音量50%, 以喇叭播放) = 3小時

but I won't play a video most of time. I will read most of time.

Specter Prophet

@CalvinKhor yes it was the def thx lord

binary relation

Calvin Khor

a lot of the battery is also from screen brightness yeah

Specter Prophet

@CaptainBohemian don't know a lot of Chinese but it says video ???(720 ppi, brightness .5, sound .5 ,???)=3hr

Calvin Khor

8:44 AM

yeah

Specter Prophet

I want to learn Chinese

Calvin Khor

@CaptainBohemian apple says that the iPad (this is the specific model called the iPad, not iPad Air or Pro or Mini) lasts "10 hours"

Captain Bohemian

@CalvinKhor no budget to buy an apple tablet now.

Calvin Khor

do you know someone in a university?

they usually have education discounts

Captain Bohemian

actually I don't even think buying a tablet now is a good idea, because I just bought a phone in Feb.

but this tablet is cheaper than my phone.

Calvin Khor

8:50 AM

I just checked a few of apple's models and they're all in the 9-10 hour range

Specter Prophet

mai be u were trying buying for larger screen?

I think I want to invent a cheap screen magnifier lol

Calvin Khor

@SpecterProphet I actually learned all my chinese after school lol they taught me chinese in school and i couldnt understand any class and failed all exams :( starting with duolingo

my parents speak chinese fluently but only talked to me in english

Specter Prophet

dude u live in Malaysia so chinese might be common but for me it's brutally hard

it looks like alien building

Calvin Khor

its more common than a lot of places but somehow i survived many years speaking 100% english :P

Specter Prophet

and thousands of different characters

Calvin Khor

8:54 AM

haha yes

Specter Prophet

that's why I think most part of china is illetrate since it's hard for them to learn

Calvin Khor

probably also because a lot of them are poor

Specter Prophet

it's like python vs assembly language

Calvin Khor

lmao

well idk if its such a good analogy, assembly code is monstrously long but number of characters in chinese is usually pretty small compared to number of english letters

Specter Prophet

it is also hard to pronounce

Calvin Khor

9:01 AM

the chinese will tell you english is hard to pronounce

Specter Prophet

u need to roll tounge slightly to speak

Captain Bohemian

tell me how long an Android tablet persists with full-charged batteries.

Specter Prophet

does chinese language have advantage in number system

@CaptainBohemian I think we should go in more physical or mathematical way

Calvin Khor

sea.pcmag.com/tablets/4869/the-best-android-tablets-for-2020

@CaptainBohemian ^

Captain Bohemian

@SpecterProphet just tell me. I am too hungry to tell physical or math way.

Calvin Khor

9:08 AM

its like you asked, tell me the mass of a star, the answer is that there's variation

Captain Bohemian

without hunger, I can do physics very well.

Calvin Khor

it looks like maybe 3-8 hours depending on model

Specter Prophet

mine last 10-15 hr

Captain Bohemian

that's why I could say I was very good at physics when in high school, when I seemed not to have so much hunger trouble.

Specter Prophet

may be it is more than 6000mAh

6150 mAh

Captain Bohemian

9:11 AM

what does mAh mean?

Specter Prophet

li po

@CaptainBohemian dude it's physics

Captain Bohemian

I don't use that kind of thing for long.

Specter Prophet

en.m.wikipedia.org/wiki/Ampere_hour

Captain Bohemian

since I don't really touch electronics.

Specter Prophet

well it's highschool physics

even I forgot basic electronics course lol

Captain Bohemian

9:15 AM

when I just graduated, I went to a battery company for interview, and they said they need some knowledge of how batteries work in chemistry while all I know is the basic principle about batteries in physics.

Specter Prophet

$A(t) = µ+acosωt$ great i have forgotten some as easy thing as finding mean value,amplitude and period of that equation

Captain Bohemian

I really need to go to solve hunger.

Calvin Khor

@CaptainBohemian milli = m, A = Amperes, h = hours

Specter Prophet

Ok now i know how to find it

Calvin Khor

@SpecterProphet its literally the 3 constants in your equation, in the order they appear :P

Specter Prophet

9:26 AM

start with unit circle

@CalvinKhor yes I know lol

Calvin Khor

well OK the period is $2\pi / \omega$

Specter Prophet

that's embarrassing lol

amplitude and mean is easy but for period u need to draw a circle to understand or u can go with the graph to understand

Calvin Khor

For period i memorised that the period of cos is $2\pi$ then I do a small calculation if I ever want $\cos kt$

Specter Prophet

I never memorize a thing in math.

Calvin Khor

lol i mean i try to memorise as few things as possible but even you have memorised the meaning of the symbol 2

Specter Prophet

9:33 AM

TBP I mean forcefully memorize

Calvin Khor

:P

Specter Prophet

0P

basically period is u start from origin and go to end which is origin which should be measured in radian and multiplying it makes u go there faster so for a unit circle which has 2pi as period so we divide 2pi with the constant u r multiplying

ok this is getting awkward lol

let's talk about higher math

Calvin Khor

lol

i gtg for a bit :P

cya

Specter Prophet

@CalvinKhor glhf

Calvin Khor

9:49 AM

tyvm

Specter Prophet

○P

Specter Prophet

10:45 AM

dude this guy is smart I think chat.stackexchange.com/users/190748

Captain Bohemian

Are you sleepy?

Does your stomach feel fine?

Should I go to the pharmacy?

How do I find a specialist?

How do you feel about a Facebook without a talkable physicist or mathematician?

Specter Prophet

@CaptainBohemian I basically think Facebook is annoying

I feel sleepy

just too tired

cya ;)

Specter Prophet

11:17 AM

ok m bak

wut is time lag lol

$\sqrt{A^2+B^2}cos(ωt−φ)$

time lag=φ/$\omega$

oh crap i know wut it is

looks like from ac circuit analysis

Captain Bohemian

12:03 PM

Do you keep contact with your classmates during the summer break？

Calvin Khor

12:19 PM

@SpecterProphet desmos.com/calculator/ngbslta8kj

Captain Bohemian

12:36 PM

I hope our society is built on allies consisting of people of the same fields.

Specter Prophet

12:57 PM

@CalvinKhor enjoy the music while learning math lol youtu.be/jiwuQ6UHMQg

@CalvinKhor u have any idea about time lag?

it seems wehn playing graph

desmos.com/calculator/hnrq9yyvxy

Calvin Khor

what about it?

If you have a graph of $y=f(x)$, then the graph of $y=f(x-c)$ is the graph of $y=f(x)$ moved to the right by $c$

Specter Prophet

yep i know

I was trying to think it intutively

in natural language

Calvin Khor

I think that's natural language

the only symbols i used are only the ones that you need to begin talking

Specter Prophet

just a ratio

Kind of boring thing defined or mention by book

Calvin Khor

the ratio is because you wrote $\omega t - \phi$ instead of the more natural $\omega(t-c)$

more natural given the above mentioned translation effect, anyway

imo $\phi$ is hard to understand, and $\phi/\omega$ is the quantity with any sort of meaning

m8 this song is gonna make me sleep

Specter Prophet

1:05 PM

@CalvinKhor u sound like a guy who like youtu.be/If9VmBlp82c

I personally listen to this youtu.be/Nx5c_JZIM6M

Calvin Khor

i'll check later lol brb

nm i checked now and yes

STRAPPING YOUNG LAD - Love? (OFFICIAL VIDEO)

►

Specter Prophet

@CalvinKhor why tf I only hear it in my left ear lol

Specter Prophet

1:37 PM

@CalvinKhor I get it then it would be easy to say the lag us compared to cos(x) since the translate in x axis is translated by c/omega lol

me too stupid to notice that

Specter Prophet

1:49 PM

vaugely speaking

Captain Bohemian

Should I go to the pharmacy to buy fiber pills?

Calvin Khor

@CaptainBohemian I don't know, I've not really had this problem before

@SpecterProphet idk m8 14 years old video so blame youtube maybe

Specter Prophet

2:07 PM

horror movie are so intense compared to math

Captain Bohemian

I don't feel in my stomach.

The fiber pills can help me solve the problem.

@CalvinKhor fiber pills are not medicine.you can eat them even if you are not really sick.

Specter Prophet

2:28 PM

why eät fiber pills?

söunds like ü r häving stomach pröblems

Captain Bohemian

Because I lack fiber.

Specter Prophet

3:03 PM

ünheälthy cölön

Calvin Khor

@CaptainBohemian ok, thanks for the info. never bought them before

Specter Prophet

reading 6 pages of newton's cooling method applied on a building with wave function was pretty unteresting

Calvin Khor

unteresting = (interesting + uninteresting)/2 ?

Specter Prophet

3:19 PM

uninteresting=-interesting

Calvin Khor

but what about unteresting

Specter Prophet

unteresting=definition above

Calvin Khor

lol

Specter Prophet

I was nearly blindly fooled by unteresting. Nice move.

unteresing is null

what about complex one?

Calvin Khor

?

i need to sleep lol

@Knight have you solved it? maybe ask a question (dont forget to add context)

Knight

3:29 PM

@CalvinKhor Yep, I found a little hint

And did it.

@abhas_RewCie What happened with life?

abhas_RewCie

@Knight just messed.... lockdowns... people... depression... now recovery...

Knight

It’s good, you must recover my friend.

You too miss skull?

Calvin Khor

can you share the solution, if its not hard to type? I noted the RHS had terms that added and pairwise added to nice looking things, but dont know how to finish

abhas_RewCie

@Knight It's been more than a month he's missing...

Is something wrong?

Knight

@CalvinKhor $$(y+z -x)( x+ z -y) \lt z^2 \\ ((x+y-z)(x+z-y) \lt x^2 \\ (x+y-z)(y+z-x) \lt y^2$$ and now all we have to do is to multiply all these inequalities and take the square root.

@abhas_RewCie I suspect, it takes my nerve off to think if something is wrong with him.

abhas_RewCie

3:36 PM

@Knight His account says he was seen 10 days ago...

so he must be alright...

Knight

@abhas_RewCie Yes.

@abhas_RewCie How’s your health ?

are you okay?

abhas_RewCie

@Knight mental problem... taking meds... much better than before :)

all this happening during JEE times is worrysome...

Knight

@abhas_RewCie Mental problems are the worst things one can ever get. Finally, you changed your avatar to your real face!

Okay, cya everyone!

Calvin Khor

night!

@Knight and thanks

Specter Prophet

3:55 PM

really want to make a extension for latex chat

really sucks when you can't use rob John's tool

Captain Bohemian

See, the breakfast eatery is afront. it will open tomorrow morning.

Specter Prophet

dude it is not afront lol it is breakfast eatery which means it only opens in morning

aren't there convenient store in your country

24 7

It reminds me of Wendy's savage tweets lol

Captain Bohemian

Imagine how nice if you wake up having breakfast to eat.

How nice.

You won't have hunger trouble later.

Specter Prophet

@CaptainBohemian hehe u make me feel like I am spoiled kid and lucky

@CaptainBohemian hehe u make me feel like I am both spoiled and lucky kid

Captain Bohemian

@SpecterProphet those shops never have chefs so their food is never cooked right before you buy.

Specter Prophet

4:02 PM

but they are pre prepared food just need to microwave

Captain Bohemian

The food sold in the shop for tomorrow morning has been on shelf now.

Food in Microwave never include delicious vegetables.

I want to eat spaghetti cooked right before I buy.

I want to eat poted noodles cooked right before I buy.

Specter Prophet

Well if u r too hungry u can buy them but if u want to just go to restaurants

they serve fresh food

I think if u want to eat at kate night u can go to McDonald's

or Wendy's

or burgerking

I know only them as 24 hr restaurants

Don't u have family to help sometime like brothers or friends who help with food problems

I really hate eating oily deep fried food

street foods are delicious in my opinion

abhas_RewCie

@Knight Agree... Yes :-)

Specter Prophet

I find southeast food better

@abhas_RewCie long time no see

Knight

4:24 PM

@CalvinKhor Welcome my friendly teacher.

Specter Prophet

I have forgotten chainrule for PDE lol

hmm looks like everyone is off

good night

abhas_RewCie

4:46 PM

@SpecterProphet hey, I think you changed your profile pic and name...

sorry, what was your old name?

Knight

NoseBleed

abhas_RewCie

Ah okay

Now, I remember him

Knight

:)

abhas_RewCie

@SpecterProphet Hey, sup?

I'm doing great :-)

Captain Bohemian

5:29 PM

Are you happy then?

abhas_RewCie

@CaptainBohemian Are there other choices?

Specter Prophet

6:08 PM

@abhas_RewCie en.m.wikipedia.org/wiki/Infimum_and_supremum

@abhas_RewCie u changed ur profile pic to a r.i.p pic lmao

Sup?I am the "Greatest".

Transcript for

$Mathematics$ Calvin's Chat Room