The h Bar

7:00 AM

@Secret Quantum wrongics?

Recently I have a very engineer mindset to problems: If a proof showed something does not work, then ask whether the universe will implode if we nuke the bits that make the proof work so the proof fails

->(binary) division by zero is one example

(for unary division by zero, see Wheels and Meadows)

Sir Cumference

Howdy @EmilioPisanty

user228700

7:26 AM

@JohnRennie :-D How was it?

John Rennie

Lovely! I feel happier now!

user228700

:-) Awesome! I've never tasted pie. How dyou make it?

John Rennie

Pie?

Sir Cumference

@JohnRennie You called?

user228700

Whoops. U ate cake. But u ate pie too, right?

John Rennie

7:30 AM

We had fish pie a few days ago, but that isn't really a pie.

user228700

1 hour ago, by John Rennie

I've also eaten large amounts of pumpkin pie and carrot cake - they're vegetables :-)

John Rennie

Ah. Despite the name pumpkin pie isn't really a pie. It's a tart.

Pumpkin pie

Pumpkin pie is a sweet dessert pie with a spiced, pumpkin-based custard filling. The pumpkin is a symbol of harvest time, and pumpkin pie is often eaten during the fall and early winter. In the United States and Canada, it is usually prepared for Thanksgiving and Christmas, and is also featured at Halloween. The pie consists of a pumpkin-based custard, ranging in colour from orange to brown, baked in a single pie shell, rarely with a top crust. The pie is generally flavored with cinnamon, powdered ginger, nutmeg, and cloves. Allspice is also commonly used and can replace the clove and nutmeg, as...

user228700

Tart-another delicacy I haven't had yet.

John Rennie

So it has a pastry base, but no pastry top.

user228700

You're speaking in a foreign language, Sir :-P

John Rennie

7:32 AM

It's basically a custard tart with pumpkin in the custard

user228700

@SirCumference x'D

John Rennie

Custard tart

Custard tarts or flans pâtissier are a pastry consisting of an outer pastry crust filled with egg custard and baked. == History == The development of custard is so intimately connected with the custard tart or pie that the word itself comes from the old French croustade, meaning a kind of pie. Some other names for varieties of custard tarts in the Middle Ages were doucettes and darioles. In 1399, the coronation banquet prepared for Henry IV included "doucettys". Medieval recipes generally included a shortcrust and puff pastry case filled with a mixture of cream, milk, or broth with eggs, sweeteners...

user228700

@JohnRennie I reiterate: "You're speaking in a foreign language, Sir :-P"

user228700

@JohnRennie I see...

John Rennie

But then there are dozens, possibly hundreds of dishes from the Indian subcontinent that I've never eaten.

user228700

7:34 AM

Same here, actually :-P

user228700

Say, dyou celebrate New Years' eve?

John Rennie

I don't celebrate it myself.

New Years Eve is a party time and i'm not really a party animal.

user228700

Oh, I see...

Sir Cumference

@JohnRennie Eh, you can invite family over

John Rennie

I will probably go to bed at 9 p.m. as usual ... then be woken by the fireworks at midnight!!!

Sir Cumference

7:38 AM

Funny story about that once

user228700

:-) @Sir: Yeah..?

Sir Cumference

My friend once heard loud bangs in the middle of nowhere, so he hid under the table and started dialing 911.

Then he realized the date was July 4

user228700

Aw x'D

Secret

8:26 AM

Claim: I am specialised in investigating any unatural mathematical objects

Secret

8:47 AM

I only don't like those who don't get along with me
I actually like those who don't agree with me as long we respect each other

This is because the more they are dissimilar to me, the easier for them to spot something about me that I don;t know about (and vise versa)

Once again that has parallels with quantum stuff: Interference is most significant if the two states are antiphase or in phase

Perhaps my whole life is quantum mechanics itself living like a normal human being after all...

Kenshin

hello

user228700

I was taking a break and took one of those dumb buzzfeed quizzes to take my mind off of electrodynamics.

user228700

The quiz was "We'll guess how old you'll turn in 2017". Somebody guess how much I got.

user228700

@Ken: Yello again :-)

John Rennie

18?

user228700

9:01 AM

Nope. 52.

John Rennie

I sympathise about the electrodynamics. As far as I can see the subject exists only to allow examiners to make up unrealistically complicated problems to set students.

52?

user228700

@JohnRennie :-/

user228700

YES, FIFTY TWO! -__-

John Rennie

But then I've long believed that all women are born middle aged while all men naturally settle at a mental age of 13.

2

This just proves my theory :-)

user228700

:-P I really doubt that.

John Rennie

9:05 AM

OK, that's true ... men's mental age is actually only 12.

user228700

Haha, I doubt that too! :-) I have a friend who's about 30 but is really only 18.

Secret

@DanielSank Well, HK people are under some really crazy pressure, given suicides in the uni and the primary school and high school ocassionally. In addition, HK has the longest work hours on the planet, everyone is pretty much ****ed

and not to mention, the political instabilities and stuff and stuff

australia people are better and more or less similar to the western countries

John Rennie

@Kaumudi.H he's an alien doing a good impression of a human male except for the mental age. Ask him if he thinks farting and belching is funny. If he says no then he's definitely an alien.

user228700

I also know the answer to both of those questions and they are both no. He's my best friend and I haven't fully ruled out the possibility that he is an alien just yet. He's the one who wanted to thank you, dyou remember? :-)

John Rennie

That's OK. Aliens are nice guys too. But if he suddenly extrudes a mucus coated tentacle with a mouth on the end of it full of sharp teeth that might be a good time to make your excuses and leave.

Secret

9:13 AM

You obviously watched too much aliens and predators

user228700

Ugh. Your description has woken up memories from the time I watched Species (1 and 2 in a row! Seriously, wtf was I thinking?!) and you don't how hard it was to bury them deep down.

John Rennie

I haven't seen Species, but it sounds fun. I wonder if my niece wants to watch it ...

user228700

Dyou still wanna watch it?

John Rennie

Eeeeeeeeeek!

@Kaumudi.H yes, of course. Mental age 13 remember.

user228700

9:17 AM

@JohnRennie Ah. I regret having watched it. It's far too graphic for a 10 year-old to have watched on a lazy summer afternoon :-( I read the description and it sounded like fun but things went downhill from there pretty fast. It was gripping too, so I watched both movies! Stupid marathon on the stupid channel.

John Rennie

Cor it has semi-naked women in (also semi-reptilian but who's counting? :-)

user228700

What's "cor"?

John Rennie

user228700

Yeah. She basically has sex with a bunch of people and turns into a terrible alien mid-coitus. I don't remember what her objective was. But uuuugh, I was 10, somebody symptathise with me :'-(

John Rennie

Definition of cor

user228700

9:21 AM

@JohnRennie Oh, wow, I've literally never heard that before.

John Rennie

I think I've just gone off watching the film :-)

user228700

:'-( Okay. Bye.

John Rennie

@Kaumudi.H No-one in the UK says cor seriously these days.

user228700

@JohnRennie Ah, okay.

user228700

Good luck feeling happy again after watching the film!

user228700

9:28 AM

@JohnR: Awesome. You're gone. GOOD LUCK FEELING ANYTHING OTHER THAN DREAD AGAIN!!!. There, I've done my job.

John Rennie

I was just reading the story identification questions on the SF Stack exchange to see if there are any I can answer.

However it's not looking good ...

Secret

9:41 AM

@Kaumudi.H I cannot seemed to find any transcript of that nature other than Balerka walking you through surjective and injective functions

user228700

@JohnRennie Oh, so movie? :-P

user228700

@Secret The day before. DanielS and me.

user228700

@JohnRennie I once read a whole series about these kids having magical powers doing stuff but I can't remember the name for the death of me :'-(

John Rennie

I'm unlikely to watch either of the Species films, regardless of what Natasha Henstridge gets up to in her birthday suit, simply because I rarely watch films.

user228700

Haha, okay. Ooh, have u read the Gatekeeper series by Anthony Horowitz? It's excellent.

John Rennie

9:50 AM

No. My niece might have as she's a big fan of the Alex Rider books.

user228700

Ohh. I haven't read those.

John Rennie

The last few books I've read are:
Essel Pratt - Sharkantula
Ernest Cline - Ready Player One
Gabriel Squailia - Viscera
Bradley P Beaulieu - The Burning Light
Cory Doctorow - The Things that Make Me Weak - novella
Adam Christopher - Mad to Kill
Warren Ellis - Normal - novella
Daniel Polansky - A City Dreaming
Stephen Palmer - The Girl With Two Souls

user228700

The Gatekeeper series is really, really good tho.

user228700

@JohnRennie Nope, haven't read any of them. Wait, oh, I bet you have a list. Don't you? Some sort of catalogue?

John Rennie

Yes, there really is a book called Sharkantula, and yes it really is about a mutant hybrid of a great white shark and a tarantula.

It isn't a very good book ...

user228700

9:53 AM

x'D I see. I was intrigued by the name so I was just googling it...

user228700

And coming up with nothing :-/

John Rennie

@Kaumudi.H I keep a list of all the books I read but I don't keep any catalogue of all my books, mainly because there are too many of them.

And people keep writing new books faster than I can read them :-)

user228700

I see...

John Rennie

> the protagonist, Matthew Freeman, is hunted by a Cult who want to conduct a blood sacrifice on him to blast open a portal using a combination of nuclear physics and black magic, to unlock another dimension which is holding a group of ancient evil demons captive.

user228700

O_o Weird...Nuclear physics and black magic?!

John Rennie

9:56 AM

Quantum field theory is black magic, so at least Horowitz got that right :-)

user228700

Omg, that's the description for the gatekeeper series, isn't it?! x'D

John Rennie

It is!

user228700

I don't remember any nuclear physics, wtf! :-o

user228700

Wait, this is the first book?

John Rennie

Though I found it under The Power of Five. Apparently it had different names in different parts of the world.

user228700

9:58 AM

Ah, yes, there was something about a nuclear reactor...

John Rennie

The Power of Five

The Power of Five (also known as The Gatekeepers in the US) is a series of five fantasy and suspense novels, written by English author Anthony Horowitz and published between 2005 and 2012. It is an updated re-imagining of Horowitz's Pentagram series, which the author had left unfinished in the 1980s. The series is published in the United Kingdom by Walker Books Ltd and in the United States by Scholastic Press. The novels deal heavily in the occult and examples of things such as human sacrifice and blood rituals are major plot elements, such as in the first book, where the protagonist, Matthew Freeman...

user228700

Only the first book tho.

user228700

Yeah, that.

user228700

I read it 3 years ago but yeah, the first book has something to do with an abandoned nuclear reactor.

John Rennie

amazon.com/Sharkantula-Essel-Pratt/dp/1541115023

user228700

9:59 AM

@JohnRennie Wow :-P I see...

John Rennie

I recommend you never read that book. In fact if you see it run away screaming :-)

user228700

Back to the power of five for a second, I want to emphasise how amazing it is!

user228700

Okay, that description makes it sound really really weird but that's just the first book.

user228700

Plus, it's not that weird!

John Rennie

I'll mention it to my niece. I suspect the series may appeal to some age ranges more than others.

user228700

10:01 AM

Yeah :-/ Although, you did just read Sharkantula x'D

John Rennie

@Kaumudi.H it's a bit of a long story ...

user228700

How u ended up reading it?

John Rennie

I saw the book and posted on Facebook saying I couldn't believe anyone had written such a crap book

But then the author replied (very politely) saying he hoped I would enjoy it (oops)

user228700

Oh God :-o :'-(

John Rennie

So I felt honour bound to buy a copy and read it

user228700

10:03 AM

But indeed, it is a "crap book"?

John Rennie

And it was ruuuuuuuuuuuuuuuuuuuuuuuuuuuuubish!!! Though I didn't tell the author that.

user228700

Oh God, that really sucks. I mean, I'm sorry you had to read it but you've got to sympathise with the author too. How did he/she even find your post?!

John Rennie

I Honestly I don't know how he found me. I have only a small Facebook presence so I'm very surprised he found it.

I think the book was meant as a parody, but to work well parodies need to be witty and funny.

And Skarkantula is neither.

user228700

Wow. That's crazy.

user228700

@JohnRennie :-( I see...

John Rennie

10:06 AM

Oh well :-)

user228700

@JohnR: This is a strange question, but if I like, die and stop coming online, would u like, want my parents to bring you up to speed about my death? Just in case :-P

John Rennie

I suspect your parents would have more on their minds ...

user228700

:-P Sure, yeah, but I'm not talking about "Oh, she died, let's update John". Eventually, I mean. Anyhoo, okay, that's settled, then :-P

John Rennie

I would probably just assume you'd decided to study biology instead - that's a sort of death :-)

user228700

Oh God x'D

user228700

10:14 AM

Anyway, I feel like I'd want to know if people I've known here suddenly pass...but I suspect there would be no way to know and that's really really sad :-/

John Rennie

You're unusually morbid today. You probably ought to stop learning about hypreconjugation if these are the side effects :-)

user228700

x'D What? No, I'm not! What else have I said that sounded even remotely...macabre?

John Rennie

Death or electrodynamics. That's ... actually a tough choice :-)

user228700

:-P Hey, electrodynamics isn't half bad. I actually really like EMI.

John Rennie

But then after I die I might go to Hell and discover that it's an eternity of exams on electrodynamics.

user228700

10:19 AM

That sounds terrible. Good luck! :-P

Secret

Ok I think I can understood the logic, though I can also see that if we don't have some conditions to restrict the possible $y$ like those parabola cases that you encountered, then we cannot really find the range that way without actually knowing the function values. $\sin(x)=y$ is a good example of that even though we can define the relation $\sin(y)=x$

However, I suppose for any function $f$ and its inverse relation $g$ (this is more general than an inverse function, something along the lines Danielsank is mentioning), if the domain of the function is the range of the inverse relation and vise versa, then the trick will work at finding the range

Graphically, at least for real functions of one variable, that will be exactly as how danielsank illustrated

The nice thing is that the condition mentioned above for inverse relations and functions always work for all polynomial functions, thus it explains why your book's method works

lvella

11:29 AM

Can someone point some didatic material on where I can get the feeling of what is a particle distribution function?

even the definitions I find seems weird

to get the number of particles in a given point in the velocity and position space, do I have to take the indefinite integral?

since the integral has no boundaries, what is it supposed to mean?

Sanya

@lvella if you have a density over a real space (meaning a d-dimensional vector space on the real numbers), then the number of particles at a given point is usually zero - because points have zero measure. You usually need to integrate over a small volume (with nonzero measure) to obtain the number of particles in that volume

lvella

Yes, I though so. But look at the fisrt paragraph in wikipedia article about particle distribution functions: en.wikipedia.org/wiki/Distribution_function

is that integration from -inf to +inf, in every variable?

Sanya

you mean in the first two formulas? Yes, I'd believe so

in the end, it's just the normalisation requirements

lvella

yes, the first two formulas

what normalisation requirements? I am trying to understand the discretization used in lattice-boltzmann method

Sanya

11:45 AM

ah well, in lattice boltzmann (which I am no expert in) we are dealing with a discrete lattice, therefore discrete point sets and then a point does probably need to have a nonzero measure

lvella

yes, but it can be dicretized from the continuous equations

Sanya

in non-lattice theory, I just want the integral over the whole phase space (i.e., velocity and space) to yield all the particles there are

lvella

that step is what I am strugling with

Sanya

that's the second requirement

the first one is that by integrating out the velocity degrees of freedom, we obtain a distribution function in space

a bit like saying "if we do not care about the velocities of the single particles, there is a number density in space"

lvella

I guess I am getting it.

I got confused by the lack of limits of integration

Sanya

11:53 AM

that's an annoying notation, I agree

what book are you learning lattice boltzmann with?

lvella

None for now. I started with article "Theory of the lattice Boltzmann method: From the Boltzmann equation to the lattice Boltzmann equation", but I guess I'll have to get their reference 16 "An Introduction to the Theory of the Boltzmann Equation".

Sanya

I read into a lattice boltzmann book for a PhD interview - Wolf-Gladrow; it was nice to read - so if you're searching for alternatives/introductions, you might want to check that out too :)

lvella

I don't really know where to go, because all background I have is classical CFD, based on Navier-Stokes and macroscopic properties

Thanks.

Sanya

Wolf-Gladrow

I remember they first introduced and motivated the lattice boltzmann method and then showed that it agrees with navier stokes afterwards

Slereah

12:40 PM

user228700

@JohnR: Guess what?! Well, it's not that exciting, but I'm going to order a chocolate pizza today :-P

heather

1:16 PM

chocolate pizza...hmm, sounds good

John Rennie

@Kaumudi.H I'm interested to hear what it's like

I have just eaten a pizza in fact. With smoked ham and Polish sausage (no veg)

heather

1:35 PM

hmm, finally went through the transcript

quite interesting conversation

user228700

1:49 PM

@JohnRennie I see. I'm waiting for my order right now. It looks like it's going to be awhile :-(

user228700

Hi, @Heather :-) Yes, it sounds good. I will post a picture when I get it.

heather

there should be a hat for editing a gazillion posts.

ACuriousMind

@heather There's badges for editing already

heather

@ACuriousMind, yeah, I know =P just being early-morning grumpy at a few posts

Kyle Kanos

2:19 PM

An interesting take on answering:

-1

A: Antimatter and annihilation of light and black light

Perhaps I'm misunderstanding your statement, but in order to 'annihilate' two photons you must have a reaction between an equivalent quantity of antiphotons, which are essentially photons with different charges and leptons, which i link to spin, which I assume is phase. When they annihilate, they...

Ending it with "Boom"

heather

2:31 PM

@DanielSank, it's developing to bad-question-and-answer-itis

DanielSank

@heather It?

Kyle Kanos

Yes, I'm not sure that makes sense to me.

Also: this was a really good game because of the improbability of coming back to win it in the 2nd half.

Until about the 5 minute mark in the 3rd quarter, Arkansas had a >90% probability to win. Then they turned over the ball a few times that led to touchdowns

heather

2:55 PM

@DanielSank you diagnosed me the other day =P

Dec 23 at 15:56, by DanielSank

Let's see how bad your bad-question-itis is.

DanielSank

Got it.

Hey @heather, funny story: we made that scheme t-shirt design. Then I left it on the website with a recovery code so I could actually order a few later. It's been a while, and I just got an email from threadless with a 30% off code.

Moral of the story: if you want something from threadless, design it and then wait a while.

Also, I just got a hat called "6" and I have no idea why.

heather

3:11 PM

@DanielSank, well that's good (that it's cheaper now). I have to ask my mom again tonight about whether or not I can get it, she said she'd think about it and i think just forgot about it. =)

DanielSank

Whatcha doing today? I'm trying to decide what project to resume.

heather

i'm going to keep reading about the bit-flip code, keep reading some books i've got to finish over break, and work more on the quantum computer simulation code, i think.

i'm also going to spend some quality time being annoyed at having to go back to school on tuesday =P

DanielSank

hahaha

Is school more annoying than useful?

(I definitely felt like it was some times)

heather

at this point the only class i'd define as anywhere near useful is geometry, but it goes pretty slowly

DanielSank

hmmm, I see.

heather

3:19 PM

and then next semester i've got an engineering elective

which should be good

but other than that.

DanielSank

Well, hopefully in high school you'll have more freedom. College is awesome because you get to do mostly whatever you want.

heather

yeah, we were doing this four-year plan thing for highschool, just to see what classes were offered, and it's going to be awesome

DanielSank

Good!

When I was in high school, I wound up taking calculus when I was a junior. The only math course after that was AP statistics and at the time I was pretty sure I'd hate statistics and I didn't want to take it.

(I was probably right. The way they teach stats in high school has little to nothing to do with the part of statistics I like)

Anyway, there was this Romanian woman on the math staff who had a masters or PhD in math from her home country.

She knew her stuff, so I asked if she could teach us multivariable calc.

heather

::@BernardoMeurer falls in love::

DanielSank

^ AHAHAHA

heather

3:22 PM

i couldn't resist that one

DanielSank

She said yes, and the principle agreed to let her do it as long as I could get twelve people to sign a thingy saying they'd take the course.

So I got twelve people to sign.

heather

cool!

DanielSank

Then the next year comes around and only six of us actually take the class ;)

heather

did she still teach it?

DanielSank

Last week, I went back to my high school and found her.

Yeah, she taught it.

It was a moving experience. Her multivariable calculus course now has forty students.

heather

3:23 PM

wow

that's....

DanielSank

They love it so much that each year the class takes a group photo with a theme!

heather

that's pretty amazing

DanielSank

They had custom shirts for the course one year!

heather

=D

DanielSank

Yeah, I was really happy that I went and talked with her.

heather

3:24 PM

at the highschool i'll be going to, there's programming classes and engineering classes and physics classes and math classes and apparently senior year i can do this dual-enrollment thing and take college classes and its block scheduling so i can take two full year courses in one year without them overlapping

and so the teachers were like "try to get an idea of what you'll take each year" because its required by the state of Iowa or something

DanielSank

What's block scheduling?

Is that where you don't have each class every day?

heather

sort of

i don't understand all the details

DanielSank

ok

heather

but the important part is that the periods (blocks) are longer so you can take a 1 year course in a semester, for instance

DanielSank

Lol, here's a review I just found on that math teacher:

"Great and caring if you really get to know her. If you're unsure about her, take MVC and you won't regret it. Unlike her other courses, MVC goes much slower and is actually so enjoyable that I'm not even sleepy in the mornings anymore. Worship the parallelepiped!!!"

@heather woah

heather

3:26 PM

@DanielSank lol

@DanielSank yeah

or a 1 semester course in a quarter

for example, i can take AP Physics I and II in the same year

::chorus of angels sings "Hallelujah"::

or AP Calc I and II the same year

or what have you

DanielSank

@heather I'm not sure what that means. Sounds like the system has changed.

Not surprising...

heather

what's different about it?

I think my mom said she had AP classes as a kid

DanielSank

Well, we had two AP physics courses, but you only took one of them.

heather

oh

huh

DanielSank

They were called "AB" and "BC". Not sure what that's about.

heather

3:29 PM

maybe BC was the advanced version of AB or something? But they're AP courses, they're advanced by default...

strange

DanielSank

Meh, yeah I think BC was "moar material" or something.

Whatevs.

So, I have another funny story from going back to my high school.

heather

these you're supposed to take consecutively

DanielSank

Oh, interesting.

heather

@DanielSank ooh, storytime!

DanielSank

Yeah, so I found one of my physics teachers.

We talked a bit and then he showed me a shred of paper on the bulletin board in the physics classroom.

It said:

Dear Mr. Patt and Mr. Thompson, $$\frac{d}{dt} \left( \frac{\partial \mathcal{L}}{\partial \dot{q}} \right) = \frac{\partial \mathcal{L}}{\partial q}$$ wut?

heather

3:32 PM

wat

DanielSank

It was in my handwriting.

heather

you wrote that note?

DanielSank

It's the Euler-Lagrange equation of motion. It's like $F = ma$ but for more abstract systems.

@heather Yep.

heather

oh, okay

@DanielSank that's fabulous

DanielSank

I don't remember it, really, but it was definitely my writing.

Amazing they kept it all these years!

heather

3:34 PM

yeah =)

why were you visiting your highschool, btw? I didn't realize you could visit like that...

DanielSank

@heather I dunno... I was going for a walk around the neighborhood park and I saw a kid with a backpack walking home. I figured classes must have just got out, so I could probably catch my old teachers.

heather

oh, that's cool =)

DanielSank

Yup. Caught two of the three I was hoping to find.

The other was my old bio teacher. She was incredible. One day she brought the respiratory system of a goat to the classroom (I guess she got it from a butcher).

She stuck a vacuum cleaner into the trachea and turned it on and the thing went "BAAHH!" like a goat.

My goodness, I learned how mechanical living beings really are that day!

heather

oh gosh, that's kind of creepy, actually

DanielSank

Yeah but I'll never forget it.

heather

3:37 PM

i'm sure!

DanielSank

Thanks for listening. It's fun to share these stories :D

Yo anyone know what the 6 hat is for?

heather

no idea, but i got it

DanielSank

hmmmm

heather

i don't think it's got a description for it on the secret hats meta post either

let me check

DanielSank

The meta doesn't know.

AccidentalFourierTransform

3:41 PM

IIRC its about deleting comments

heather

i also got the don't want to taco bout it hat

for some reason

meta doesn't have the answer for that either.

DanielSank

@AccidentalFourierTransform orly?

@heather Do you want to try to discuss how you got it, or do you not want to taco bout it?

::hides::

heather

@DanielSank, ::sighs::

DanielSank

Whatever, you should hear the stuff I put up with at work.

AccidentalFourierTransform

taco is about editing posts and leaving the edit summary empty

DanielSank

3:45 PM

There are three certified punmakers in the office.

@AccidentalFourierTransform How U know?!

AccidentalFourierTransform

23 hours ago, by AccidentalFourierTransform

@DanielSank well, Im literally "Just Here for the Hat(s)"

hats is life

DanielSank

Doesn't answer my question.

heather

oh, then no wonder i got it

DanielSank

I just edited a post with no explanation to test your theory.

heather

i do that all the time, though i shouldn't

bet you'll get it @DanielSank

AccidentalFourierTransform

3:48 PM

@DanielSank you have to do it a couple of times

heather

@DanielSank lol, nice

AccidentalFourierTransform

or three, I dont know

lets say, several. Do it till you get it

DanielSank

I just did three or four.

This is a duplicate, right?

0

Q: Can the physics of quantum mechanics apply to macroscopic objects?

I was wondering, can the laws of quantum mechanics apply to everyday objects like pencils or apples?

heather

that seems like that should definitely be a duplicate of something

AccidentalFourierTransform

3

Q: What's the boundary of microscopic world and macroscopic world?

In other words, what's the maximum size of a Quantum denizen upto which it shows Quantum behaviors? How big do I need to create a molecule (or, collection of molecules) so that Feynman's multiple path and multiple history would no longer be applicable to it? In a sense, Feynman's multiple path an...

quantum-mechanics quantum-field-theory

or

1

Q: Explain why quantum behavior is not observed in daily life

People always ask: How come we don't see any "Wave" attached to a classical object such as a car? You always see the object in the same place without any uncertainty. I am sure there are answers, but please use the simplest language understandable by general public.

quantum-mechanics everyday-life physical-constants

or even

2

Q: Quantum mechanics in macroscopic systems

I don't understand the superposition principle in quantum mechanics or the collapse of wave-function (I think it's impossible for me to understand it) My question is: Is it possible to demonstrate the quantum mechanical behaviour (Superposition and wavefunction collapse, etc.) in some macroscop...

quantum-mechanics

heather

3:53 PM

yeah

wow

those all seem like they themselves could be duplicates of each other

AccidentalFourierTransform

and

4

Q: Can actual quantum effects occur on a macro scale?

I apologize if this question is posted on the wrong portion of the website, but I knew no better place to ask. I've come to see that some effects, such as super-conduction may happen at either extremely low temperatures, or at extreme temperatures (the recent discovery of superconducting iron in...

quantum-mechanics

yeah, people ask that question very often

and "do we really need complex numbers in QM?"

incidentally, you know the answer to that question: complex numbers can be emulated with real (rotation) matrices, and therefore there is no intrinsic need for complex numbers, its just convenient

heather

@AccidentalFourierTransform huh, that's true

=D

DanielSank

@AccidentalFourierTransform Yeah. The structure is needed though.

$[x, p] \propto i$ is important.

AccidentalFourierTransform

well yeah, you need something. The point is that you can write everything without ever using the symbol $i$

DanielSank

Whether you want a matrix or whatever, you still need that basic relation.

Right, and we could write real numbers as limits of sequences too ;)

heather