The Nineteenth Byte

El'endia Starman

5:00 AM

Humph. Test*ing* Test ing Testing

Well, that sucks. Zero width spaces don't make the markdown work like it should.

Anonymous

First SQL answer by me:

Anonymous

0

A: Golf the xᵗʰ root of x

SQL (MySQL), 60 bytes CREATE FUNCTION G(X REAL) RETURNS REAL RETURN POWER(X,1./X); Caps lock is cruise control for cool golf.

Alex A.

Test*ing*

Testing

@El'endiaStarman ^ works if you omit the zwsp entirely

El'endia Starman

......I could've sworn that was broken before.

Alex A.

Me too actually

El'endia Starman

5:02 AM

Well, whaddya know. SE Chat became better.

Downgoat

@Quill what is PopcornSE and why is it controlling my computer. Did you intall a virs on my compouter?!?! >:U

Quill

oh you installed my userscript <3

it's a flag retainer

it lets you see the flags you missed

Downgoat

@Quill uh

I'm not a mod

@Quill I did??

Quill

>=10k network users can see chat flags

Downgoat

oh

chat flags are very rare. brb uninstalling

Quill

5:04 AM

@Downgoat maybe you were drunkgoat when you did it

> chat flags are very rare

haha

Downgoat

what is so funnt

@Quill yeah. I felt like I was upgoat...

Jester Tran

Suppose (X,d) is a metric space and Y is a subset of X. What is the difference between the following statements:
1. Y is closed.
2. Y is closed in X?

El'endia Starman

$Mathematics$ Mathematics

Associated with Math.SE; for both general discussion & math qu...

12

3

Oh, I see you just posted that message over there.

Anonymous

@JesterTran 4 bytes

Quill

in<space>X? I count 5

Dennis

5:10 AM

6 if we go by the edit distance. If we troll, we should do it properly.

Anonymous

Bytes matter, not Levenshtein distance

Anonymous

(unless it's one of those challenges)

Jester Tran

@El'endiaStarman Is it possible to make a plugin or something for google chrome such that each time I visit chat.stackexchange, it asks me to enter a message which will then be distributed to checked chat rooms just like how I did it manually (go through each room and enter question.)

Quill

no

El'endia Starman

@JesterTran Maybe, but you shouldn't do that anyway.

Quill

5:11 AM

asking questions / saying the same thing in multiple chat rooms is bad

Dennis

@JesterTran I'm sure that's possible, but you really, really shouldn't do it.

Quill

Most chat rooms don't take very well to help vamping or multi-chat spamming

Dennis

Questions about metric spaces are pretty off topic here anyway.

@El'endiaStarman IIRC it works in chat, but not on the main/meta sites.

Alex A.

@JesterTran In general you should seek to find the appropriate place for your question before asking it so as only to have to ask it once.

That would be a perfectly fine question on Mathematics itself, not just in their chat.

El'endia Starman

^

Quill

5:21 AM

Chat rooms aren't supposed to have topic outside of their parent site's scope anyway... but that's another issue entirely ;-)

Anonymous

@Quill According to the original rules, yes. But chat rooms have grown beyond the original vision/scope, and even the CMs admit that the rules regarding chat could use some tweaking.

Quill

s/original/current

and yeah, chat has grown a bit

Anonymous

"a bit"

Alex A.

@Mego [citation-needed] regarding CMs

Anonymous

296

Q: Toward a philosophy of Chat

TL;DR: The Problem This keeps happening in chat: Surprise at flags on vulgar messages. Language that would invariably get your comments deleted on the main site occasionally gets flagged and deleted in chat. Confusion reigns. Controversial topics leading to bickering and name-calling. Folks b...

Quill

5:26 AM

> I said at the start that my primary goal here is to re-write the guidance that is given to folks using chat; indeed, several of my co-workers are already hard at work on this.

Alex A.

Right, they mean tweaking to get the rooms back toward the initial vision of a place for on-topic but less structured conversation relating to a given topic. Surely The Nineteenth Byte is not what any of them had in mind.

Quill

I doubt TNB's off-topic conversations are the cause of focus on the CMs' minds

~~When was the last time TNB had a flag~~ actually never mind, I have it retained ;p

El'endia Starman

The CMs probably don't mind TNB very much at all. We have a really nice room culture.

Alex A.

That's not what I mean

I mean in terms of a place with discussion not even remotely related to the site's purpose

Anonymous

My interpretation was "chat is being used entirely differently from what we had in mind, and so we want to re-write the guidelines to better fit the current usage while still maintaining the original principles with which we started chat"

Quill

5:30 AM

@AlexA. yeah

Sp3000

@JesterTran As Dennis says, questions like that are off-topic here, although arguably it's more on-topic than some of the things that get said here. Having said that though, in true Stack Exchange style - what have you tried?

Anonymous

I'd argue (probably unsuccessfully) that our random discussions here are beneficial for the site, because challenges have been inspired by chat a significant number of times.

Quill

For the most part, the SE rooms are less of a focus for the mods; individual site mods usually police the rooms pretty well

Sp3000

Maybe it's just me, but I'd probably prefer a challenge inspired by metric spaces than a challenge inspired by avocadoes

9

Alex A.

^ agreed

Anonymous

5:32 AM

I'd prefer if people stopped beating memes like avocados into the ground, but I appear to be in the minority

Alex A.

While I have nothing against random or varied chat discussions in general, I do think we could stand to give on-topic discussion the right of way when it happens rather than drowning it in memes. :P

Anonymous

I do make an effort to drop off-topic discussions whenever an on-topic discussion starts

Alex A.

Not everyone does though. Even if one or two people do it, this is such an active room that it unfortunately doesn't seem to help all that much.

Jester Tran

@Sp3000 Is this in reply to my metric space question?

Anonymous

The best we can do is lead by example and give gentle nudges in that direction :)

Solver

5:35 AM

I am still here!

Alex A.

@JesterTran It is indeed. You can click the arrow that appears on the left side of the message and it'll link to the message it's replying to. :)

Sp3000

@JesterTran Yes - what have you tried with the question so far?

Anonymous

@Sp3000 If I knew anything about metric spaces other than the fact that Euclidean and Minkowsky spaces are important in math and physics, I might try writing one

xnor

How would "check if an adjacency matrix represents a metric space" be?

maybe it's too much about just iterating over triples to check for triangle inequality

Alex A.

@xnor It sounds nice! I think it'd take some careful explaining to make it accessible for the less mathy folks but I think that's certainly doable.

Sp3000

5:41 AM

I guess it might be interesting if there's a better way for triangle inequality, but otherwise it'd be like checking associativity for groups and I think that's probably already been done

xnor

@Sp3000 yeah, i think you're right

Jester Tran

@AlexA. It's all the way up there, how can you see it?

xnor

@Sp3000 and indeed group-checking has been done: codegolf.stackexchange.com/q/49000/20260

Jester Tran

@Sp3000 I think there is no difference

Sp3000

@JesterTran What makes you think that?

zyabin101

5:45 AM

Hello

Jester Tran

Suppose (X,d) is a metric space and Y is a subset of X. What is the difference between the following statements:
1. Y is closed.
2. Y is closed in X?

1 => 2: Y is closed and Y is a subset of X, hence Y is closed in X.
2 => 1: Y is closed in X, hence Y is closed.

xnor

@JesterTran That's basically just restating the claim.

Jester Tran

@xnor therefore, no difference

xnor

What does it mean for a subset of a metric space to be closed?

Jester Tran

@xnor It means the that subset is closed and fully contained (or equal) to the metric space

Sp3000

5:49 AM

Hmm, I don't think that's quite what xnor means. e.g., is (0, 1) closed?

Anonymous

6:01 AM

I believe I understand what it means for a subset to be closed

Anonymous

Consider the Euclidean metric space on R x R

Anonymous

A subset of that metric space would be the unit circle

Anonymous

Whether it is closed or open depends on whether or not you are including the points along the circumference of the circle in the subset

Anonymous

e.g. whether in polar form it's theta in [0, 2*pi), r in [0, 1] or theta in [0, 2*pi), r in [0, 1)

Anonymous

Or in rectangular form, sqrt(x^2+y^2) <= 1 or sqrt(x^2+y^2) < 1

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Mathematics

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$Mathematics$ Mathematics