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Danu

12:49

@ACuriousMind I mean to flesh out the details - CW or not, etc

ACuriousMind

@Danu Probably another question with vote-style answers, then?

Danu

Yes

Where's that recent field medal question?

someone who asked whether anyone could explain a bit more about it

oh, found it

not enough attention

Q: Making new sense of the three-body problem in the light of Maryam Mirzakhani math contributions

I am unfamiliar with moduli spaces and ergodic theory which appear to be essential in Maryam Mirzakhani's math contributions which won her the Fields Medal. However, I am well conversant in essential topology, general relativity, Hamilton–Jacobi equation, and see why in integrable systems the mot...

nobody knew how to answer it, i presume

ACuriousMind

I briefly wondered what question you meant. Then I clicked on it and I had already voted it up. It's probably really that only very few people could currently answer that.

Danu

Yeah... regrettably. Perhaps x-post to math?

ACuriousMind

Though 88 views for that question are a bit sad

Danu

12:57

btw, what really is ergodic theory?

there's a section in Reed & Simon called that - but it just talks about investigating the ergodic hypothesis

I think the field is much broader, no?

ACuriousMind

Mumble mumble...phase space...flows...mumble...measure-preserving...I've honestly no idea what it precisely encompasses, it has something to do with situations, where there is a measure of some kind on your phase space, and then you study only the morphisms that preserve the measure, but I don't really know what you do with it.

Danu

13:22

yeah.... something like that

That came up in the Reed&Simon section too

tohecz

13:35

Hello to Physics.SE!

Danu

ACuriousMind

tohecz

Can I have a brief question regarding scientific English?

Danu

sure, ask away

ACuriousMind

Shoot, if someone knows, they'll answer

tohecz

13:39

"All elements of set A have an F-extension." / "All elements of set A have F-extensions."

which is correct? I'm lost here I think, because in Czech, both are possible without any problem

ACuriousMind

@tohecz In which context is this extension meant? Is it a set-theoretic thing? If yes, which one?

Danu

Each elements of A would be better than your first option

ACuriousMind

Without context, I'd tend to favor your second version

But perhaps you shouldn't take advice from a Dutch and a German on that :D

tohecz

13:59

@ACuriousMind well, that was a simplification. My real sentence is: "There exists $c>0$ such that all rational numbers $x\in\Q\cap[0,c)$ have a purely periodic $\beta$-expansion."

ACuriousMind

14:20

@tohecz Now that sound alright. I'd probably keep it that way if the $\beta$-expansions are unique, but if the are many, and not a canonical choice of one of them, "...have purely periodic $\beta$-expansions" would sound a bit better

tohecz

@ACuriousMind there's one expansion for a fixed $x$ only, yeah

3 hours later…

ACuriousMind

17:03

Oh dear, I see drama headed our way

Q: Are there any good physics jokes?

I've noticed some other SE sites have a canonical "what's you're favorite joke" question in them: Math Overflow's "Do good math jokes exist?" Cross Validated's "What is your favorite data analysis cartoon?" Cross Validated's "Statistics Jokes" Stack Overflow's "What's your best programmer jok...

homework humor

6 hours later…

dmckee

23:25

@tohecz I think that the first version would be better as "Every element of set A has an F-extension", and then it's a toss up to use the (corrected) first version or the second version.

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