Mathematics - 2018-09-24 (page 1 of 5)

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12:00 AM

I'm with you on that. It's not practiced universally even within the United States, and it's just outright not necessary in the modern world.

@Jasper this is fair, and yeah I don't like DST one bit

I mean, if schools or companies want, they can always start or end earlier or later on certain days.

I've even heard tell that it's created clerical errors or accidental time fraud in the past (but that may not be true, this is just from memory).

Russia did away with DST recently I think. Now Moscow is UTC+3 all the time.

doesn't Russia have a single timezone for all of its territory ?

12:04 AM

I think it has 11 timezones, from UTC+2 to UTC+12.

I seem to remember hearing a similar thing, that administratively the Russian government set a universal time across their territory. But I don't know to what extent the people themselves abide this time.

There are eleven time zones in Russia, which currently observe times ranging from UTC+02:00 to UTC+12:00. Daylight saving time is not used in Russia (since March 2011). == List of zones == Since 4 December 2016, the time zones are as follows: == Daylight saving time == Daylight saving time in Russia was originally introduced on 30 June [13 July, N.S.] 1917 by a decree of the Russian Provisional Government. However, it was abandoned by a Decree of the Soviet government five months later. Daylight saving time was re-introduced in the USSR on 1 April 1981, by a decision of the Council of Ministers...

What function has the most zeros

the zero function

really?

12:08 AM

I guess I was very wrong about that lol

At all values of x, the value of y is zero, so the zero function has the most zeroes.

it depends on the domain then, the larger the domain, the more zeros it has

so it's like asking what is the biggest set

Still uncountably many nevertheless

Besides the zero function

It also depends on what you mean by more. A subset of an infinite set can have the same cardinality as the set itself.

12:10 AM

how about what function has the most zeros per unit space

are you geocalc ?

from a few months ago ?

your gravatar looks very similar

He is

I suspect Secret is Victoria, lol.

@Ultradark the function that's 0 everywhere except 1 at 0

where is the room owner

12:13 AM

o..o

You can flag posts for moderators. I don't think there's a sole room owner.

O..O

Hi @mercio @MarkS, rehi Demonark, hi @Fargle, et al.

Hey Ted!

Heya @Ted, how are you?

12:14 AM

I was declared room owner without having a say. I don't know if there are others at this point.

Still alive, @Fargle. I go to the cardiologist next week, so maybe not then.

@TedShifrin How did that even happen?

hi ted

I have no idea, @Jasper.

I saw something about it in the chats faq somewhere

Perhaps mods decided; perhaps bots decided.

12:16 AM

Maybe because you got many stars...

Maybe rep-related.

@TedShifrin I wish you the best of luck.

I think if the room owners are inactive for a sufficiently long time (or if they leave or something), the chat automatically appoints one

I think you are the longest active still-active member. Likely it was simply a message count over a long period of time, among people in the room for the last 2 weeks.

But most of the stars are from me...

12:16 AM

Our room owners have certainly been absent. I miss them.

LOL @Jasper

Ted

I finally understood the difference

I would like to believe it's more than that, @MikeM.

I miss many things but our halcyon days are never to return

Geeezzz :D

@TedShifrin Or maybe because you talk a lot, lol.

12:17 AM

@TedShifrin It's an algorithm of some sort like that. I doubt it's fancy.

smacks @Jasper

Uniform con does nto depend on x in I

What happened 6 months ago

and pointwise depends on both episolon and x in I

@KasmirKhaan I read that as unicorn

12:18 AM

@Kasmir: You need to say that the $N$ depends or doesn't depend.

yeah the order of the quantifiers is different

But yes.

both N depends on epsilon allways

@MikeM: Have you flown to your talk destination already (I hope)?

but in case for uni , the x values dont matter

12:18 AM

Are there functions with clusters of zeros

@JasperLoy -.-

Yesah

Right, @Kasmir. I tell people to draw the $\epsilon$-fence around the limit function. If for large $n$ the graphs of $f_n$ all stay inside the fence, then it's uniform (and vice versa).

@Ultradark What do you mean by cluster?

OK, @MikeM, so you're ready to give the talk at 3 AM. Good. :)

12:19 AM

The closure of Ted is - inf to inf

Say hi to all my old friends and old office :) I used to be in 2-177.

@TedShifrin thanks Ted ! :D

like a group of zeros then a gap then another group of zeros then a gap then a nother group of zeros then a agap and then keep going

I will likely do neither of those, if that's ok.

zeroes can be wherever you want

12:20 AM

<3

@Ultradark And what do you mean by group and what do you mean by gap?

@JasperLoy

Grumph @MikeM. How hard is it to say hi to an office down the hall? :P

user image

It's actually 3 floors down. You see the problem, I'm sure.

12:22 AM

Oh, there didn't used to be classrooms on the 3rd floor. I guess the multi-billion dollar redo changed things.

Multi-billion dollar redos are wont to do that.

@Ultradark Well, you can have any function you want. Just that you might not be able to write it as a polynomial or something simple...

BTW, @MikeM ... you can't get to the third floor without starting on the first. I know how it works.

oh okay

Are you sure? Jim Simons added to the building recently.

12:23 AM

That's part of the multibillion dollar redo I'm referring to.

@TedShifrin Well, unless you parachute, lol.

In his drive to have all math depts across the east coast bear his name.

LOL @Jasper

There's a fourth floor now for more offices.

Well, he has an MIT connection, if I remember correctly. Wasn't he a Moore after his PhD?

Oh, better than the basement.

12:24 AM

As long as there is a lift.

Still, you walk into the university at ground-level, "irregardless." That's floor 1.

@TedShifrin Not for grad students, to be clear.

Oh :(

Here comes Eric.

Who's Eric?

12:25 AM

Eric Silva.

I know, I know. I'm pretending I know not.

Eric is my geometry twin :)

I am bad at pretending.

idk who eric is

But in The Phantom of the Opera, there is a line in a version of the lyrics that says 'In the dark, it is easy to pretend'.

Good, I don't either.

12:27 AM

So I figure that both of you must be in the dark, QED.

lol

I'm very dark.

Do Portuguese and Spanish speakers confuse the two languages?

no

I can't imagine people speaking more than 3 Romance languages.

12:29 AM

they are very hard to confuse

Well, not counting Latin, I'm trying to learn my second (Spanish).

Well, you know what they say, @Ted. Fortes fortuna adiuvat.

I don't remember enough Latin.

Neither do I.

I'm ultradark

12:31 AM

You healthy again, @Fargle?

@TedShifrin good choice

My Latin is limited to ie, eg, am, pm, cf, etc. LOL

especially in San Diego, Eric

@TedShifrin Yes, fortunately.

especially in the us as a whole tbh

12:32 AM

Good. So I should inquire about the algebra question? :D

so many spanish speakers

true, Eric ...

Now I regret not having taken it in college ...

I should have done that instead of Russian, no doubt

they way outnumber us lusophones

How did you learn Latin @TedShifrin?

Although I did have to read a few Russian math papers

two years in high school, Jasper

12:33 AM

what does Quotodum dante exum mean

hell if I know

you had russian in high school???

no, no, Latin and French in high school

Russian in college

gotcha

along with German (5 semesters) and French major

12:35 AM

quoto dante

a hs teaching russian in the us pre collapse of the ussr would’ve been weiiird

Ours just had French, German, Spanish, Latin

and Latin was totally dying out

I wanted to take Latin III, but not enough students

veni vidi topology

I came; I saw topology

@TedShifrin that’s still a lot lol mine had spanish and french

12:37 AM

Well, I'm back in the late 60s.

These days, schools have various Asian languages (for good reason).

they didn’t let me take spanish cause they wouldn’t believe me when i told them brazilians don’t speak spanish

Yeah, all of South America is Spanish ... wtf ...

still, for math, French, German, Russian are the standard languages

How can we prove soundness property of a system if the premises might be false?

Soundness property is if $\Gamma \vdash \varphi \implies \Gamma \vDash \varphi$ but what if $\varphi \in \Gamma$ and $\varphi = \bot$?

@TedShifrin sad how many people are unaware that like 200 million south americans don’t speak it

You'd better wait for @Alessandro, @user525966.

Eric, these days there are a lot more things to be sad about.

12:41 AM

there have always been more things to be sad about

I can sing

in Catalan

Yeah, I guess I can't dispute that.

i gotta help w dinner so i’m outtie

Hang in there, @MikeM.

Bon appétit, Eric.

ciao

12:48 AM

@TedShifrin I'm feeling better, but I'm still not great at algebra, haha. I haven't cracked it yet.

Well, settle $7$ and let me know :P

I'm not great at algebra, either, BTW.

I parsed that as you being sad about the algebra

me or Fargle?

in this room, I'm often sad about algebra.

"I'm feeling better, but..."

hmm ... weird parsing.

12:51 AM

ah

leaves it to Fargle to sort out

@TedShifrin yep

I don't feel that this question should be on MSE. However, it's more specific than previous questions, so it's harder to shut down with the usual line "don't ask about validity of preprints".

what's wrong about working through a preprint and trying to figure it out?

I don't think MSE is the right place for that; maybe for understanding mathematical steps in published work. But if you click you'll see it's not an arbitrary preprint.

yes, I looked

And I already posted on FB about how I find the whole thing embarrassing and sad.

12:57 AM

the uneducated users who keep posting about this are making it far worse than it has to be.

would really like this to be as quiet as possible, but I guess it's 2018.

I suppose. But trying to "prove" that a 90-yr old can still do fantastic mathematics is sad and embarrassing.

He's been told by good friends and colleagues to desist, and he won't.

I won't draw any insulting analogies.

I wouldn't blame him that conferences are giving him speaking slots.

I just picked up a good vocab word

That's the fault of the organizers. They should know far better.

It's hard for organizers to turn down a legend ...

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