Appendix A is a good summary of very basic bounded functional analysis that everyone should know

@0celo7 Nah. You are just a normal guy. Even non-Christians wish Merry Christmas to everyone.

I think I'm emailing an atheist

@Sid The US has some rather strange hangups about Christmas wishes, I think :P

^ this

I'm an atheist but still wish people merry christmas

not sure how others feel about it though

@ACuriousMind The US is simply messed up.

The US should really split

I agree with Lubos Motl that Christian Atheism is the best system

Actually he's Catholic atheist but those priests tend to diddle kids so ehhh

@ACuriousMind you're not watching the spaceX launch?

I know that some catholics love saying that atheists are really protestants

something like 16:45 UTC, I think

But that is a common religious thing

Where all the Others are the same

Like how the Shiah basically think that the sunnis are jews

Or a jewish plot

To destroy Islam

@EmilioPisanty I'm not sure why I would, really.

Am I a contrarian?

I find space stuff really boring

Yes.

It's cool we can shoot stuff into space and all but at this point it's not so exceptional I'd be hyped to watch it happen

If you deny it you'll only prove me right

:(

I mean is it really that hard to make a moon base

I'm not asking for much really

@Slereah I always thought that was the other way around. :/

Even a shed on the moon would be nice

talking about Jews in this chat is always a dangerous prospect

especially comparing people to them

but so many physicists are jews

How can we not

@ACuriousMind Are germans pro palestine or israel?

@0celo7 So far I see no reason to be concerned :P

I think Germany basically can't say anything bad about Israel

Due to History

@CooperCape should be worried

@0celo7 That depends on the German, of course! It's a contested political issue - the left-wing parties tend to be more in favour of Palestine but I don't think the party lines are particularly strong on that issue

@0celo7 Uhmmm whyyyy

What did I do

you've been banned a couple times for Jew-related content

Twice

Second time was self-referencing

Let's be fair.

@CooperCape are you alt-right?

@0celo7 I'm lost

epand

@0celo7 is alt-right=far right?

Oh yeah

that one

I don't really know

Maybe he's ctrl-right :P

back in 2016.5 it wasn't

it was just stuff like r/TD and people who didn't like the GOP

To be fair if you search 'Jew' in my chat history...

then some white supremacists and Nazis (some of them actual nazis) showed up and ruined it

At least 66% of them were removed upon being banned.

never go to germany during a depression, yikes

I went to Germany once

wasn't a depression

Anyway man's got nothing against the Jews.

"Patriotism is supporting your country all the time" - Then, what is nationalism?

@CooperCape it's effectively Chinese for hello (I've ignored accents showing pitch) as I've been in China for most of the past week - 'ni' is 'you' and I've forgotten what 'hao' actually means

@Mithrandir24601 Oh, right nice! Been kung fu-ing it?

@Blue Test question- Differentiate between Patriotism and Nationalism(10 marks)

@Mithrandir24601 have you defected yet?

as far as I'm concerned people who go to China are compromised

who knows what happens to people there

brainwashing, etc.

@Blue More funny is that in my humanities test, we had to write an essay on "Capital Punishment is inhuman and morally degradable...." - And my friends wrote that Capital Punishment=Taking away someone's money. smh

@CooperCape no actually :P was at a conference

@Sid Uh, what if you agree with the death penalty? You couldn't take either side?

@Blue Oh for the love of Christ

@0celo7 No. Even if you did, you had to write the other side

(Trapped quantum systems = ions, cold atoms, photonics and other stuff that's relevant to my PhD)

@Sid What a garbage prompt

@Mithrandir24601 Oooh anything interesting?

@0celo7 wait, maybe you can twist the whole thing by continuing along the lines of, "morally degradable. This is a statement I don't agree with."

If someone is creative enough, they can, I guess

@Sid I would probably agree that it's inhuman, but the people who deserve the death penalty are also inhuman.

As for morally degradable...just use moral relativism to go to a frame in which it's moral.

@CooperCape ... I had lunch with Jeff Ou yesterday - I think that counts :) in terms of the conference, there were a few talks that were interesting - the 53 qubit trapped ion simulator, both my supervisors, Ou, emergence of arrow of time (catchy title, but doesn't really explain what the talk was about)

Actually, most of the talks were interesting, those just particularly stand out

@Mithrandir24601 A quick google tells me he's a bit of a knowledgeable guy on 'quantum inteference' (whatever that may be)... And the 53 qubit trapped ion simulator... uhhh... what a classic... yeah.

@Kaumudi.H Prepare for next exam?

Why not, uh, enjoy doing nothing productive at all? :)

@ACuriousMind -;-

@Kaumudi.H topology

oh, 3 hours

watch John Wick

@Mithrandir24601 what conference?

@Kaumudi.H watch a movie. Balarka had recommended "A Clockwork's Orange" to me.

@glS Asia-Pacific workshop on Trapped Quantum Systems

@Blue ok if you're going to capitalize incorrectly please do it consistently

Hm

Hall defines the adjoint of unbounded operators on domains where they're bounded

How do you work with $x$, though

Do you just define $(-a,a)$ and then that to infinity at the end?

@ACuriousMind so reviewing my nuclear physics notes, the prof seems to be saying that parity non-conservation in the macroscopic world is from the weak interaction

bc the domain of $x$ is pretty wide otherwise

is that just an old man's crazy ramblings

@0celo7 that is correct

QCD and QED both preserve C, P and T symmetry

@0celo7 What does he mean by "parity non-conservation in the macroscopic world"?

@ACuriousMind helicity of DNA, sea shells, and human hearts

it's straight out of viXra

@0celo7 wat

@0celo7 wat indeed

@0celo7 I guess my question is

That's...pretty much non-sense, yeah.

Is $x$ self-adjoint

Or is it just symmetric

@0celo7 O.o

I think the last line two lines have to be jokes. i.gyazo.com/b3cbb255d3f0ccadad8ef4562a9dce87.png

Uh...is that an actual slide from a physics course?

Yeah I think he may be either joking or he has dementia

@Slereah it's essentially self-adjoint

@ACuriousMind yes

@0celo7 How do you define the adjoint, though

the rest of the slides are not like that

It's not bounded on its domain

@Mithrandir24601 nice! What did Bristol's people (O'Brien? Thomson? Laing?) bring?

@Slereah he defines essentially self-ajoint in there

yeah but it's like

The adjoint only works if it's bounded on the domain

Do you just select a smaller domain?

Because I'm pretty sure $x$ is unbounded on $Dom(x)$

look at section 9.8

of course it's unnbounded

9.8 is a bit far ahead

I guess I'll have to read on

Hall is a bit shit for that

the proof is nontrivial

It's full of "See proof 9 chapters ahead"

its a nonlinear book

Corollary 9.31

it's a Make your own adventure book

@Slereah you can define a parity inversion operator that maps $x \rightarrow -x$ (and the same for momentum)

@Mithrandir24601 what on Earth are you talking about

"Although establishing essential self-adjointness is a crucial technical issue, it is best not to worry too much about it on a first encounter with quantum mechanics. "

@glS Anthony Laing (my supervisor) did a talk on the photonic chips and current efforts at simulating molecules. We were the only 2 from Europe, never mind Bristol though :P

@Mithrandir24601 The parity discussion and Slereah's operator issues are two disjoint conversations ;)

OK, atoms, not really molecules

@ACuriousMind obligatory SMBC, of course

What is the domain of this conversation

regarding the old physicist

@Slereah the category of sets

@Mithrandir24601 the experimental quantum hamiltonian learning work?

@ACuriousMind fair enough - I blame tiredness and that I'm using my phone :P

@glS no, that would be another of Anthony's students - there's 6 of us this year

you call him by his first name? Scandalous

@0celo7 Y'know, there are large companies where the culture is to call everyone by their first name, why does this unsettle you so much in academia? :P

I'm the one looking at simulating open systems and PT symmetry

@ACuriousMind blame my advisor. Morwen asked him at dinner a few weeks ago if I could call him by his first name and he said no

so now I'm rationalizing it

Another prof calls me Dr. Ryan in protest now

@0celo7 Wait, the elf lord asked for you and he refused? That's...an odd move

@Mithrandir24601 I see. Do you work with Stefano and Raffaele on the chips?

@0celo7 lol

@ACuriousMind yep

@ACuriousMind I was there btw

and a bunch of other people

very awkward

Dear god that must've been awkward

"It should be noted that, for a given ψ ∈ L2(R), Xψ might fail to be in L2(R)."

wot

Isn't it just a multiplication by a scalar, p. much