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13:01
@Robjohn: thank, sorry that you've deleted your 5 upvote comment
@Ilya Well, it referred to a deleted answer, so it was confusing to any one under 10K, and hopefully a new answer will be accepted.
@robjohn isn't mine accepted?
@Ilya Not when I last looked. It might be now.
hm :) I had an impression it has been accepted for a long time
@Ilya I just checked and the deleted answer is still accpted.
13:06
:3725792 Yes, I do! : D
@tb You know, you started it. : )
:3725781 Don't show off too much. When I had Krantz for analysis, he made a take home exam that he said "do 5/10", except he said that he expected me to do all 10. He also said there was one problem that was just for me. You don't want that kind of attention ;-)
@robjohn Yes I do actually. It makes me make an effort. : )
If someone did that to me I'd try to get all 10 100% right. : )
@robjohn Cool, I would love it when Krantz told me that 8-).
@MattN I was kidding. It was Krantz's recommendation that got me into Princeton for grad school.
:3725857 I know the expression! Now I'm wondering whether this means that you solved the carrot puzzle.
Yes. : )
@robjohn I see! You were bragging! : ) (Assuming that Krantz is some famous dude that I'm supposed to have heard of) : )
13:14
^ this is going to be the last removed message from me for a while...
^How do you know?
@robjohn Did you ever visit Einstein's house at Princeton?
@Skullpatrol I saw it from the outside.
@MattN maybe a little, but I was trying to make a joke about getting too much work from the professor.
@robjohn I don't mind if people brag. As long as it's not too much : )
@MattN In analysis circles he is well-known for some good books he's written.
13:18
Yeah! Here the second years complex analysis class is by his AMS book :-).
@robjohn What do you think of his History of harmonic analysis?
@MattN Very nice.
@tb all 10 books on the bottom of the page are also by Krantz :-)
@AsafKaragila Yes : )
One one star review. Hm.... Is he famous for writing unpopular books? : )
I must have misremembered the title, let me see.
13:20
@JonasTeuwen I don't have it. I need to get more of his books, but they are usually pretty pricey.
@robjohn Not for me. There was also this :)
"A Panorama of Harmonic Analysis"
@AsafKaragila Must. Not. Rest. On. Laurels.
We use this for complex analysis.
@MattN A more than slightly exaggerated opinion is expressed there, I think...
13:22
@Matt: Congratulations!
@tb Claiming that it's full of typos seems like a pretty objective measure though. I can't stand typos.
@BrianMScott Thank you! Thanks to you (and Asaf)
That was fun.
Next time I'll allocate more weeks.
A complete book on the implicit function theorem?
@tb Yes, I saw.
13:25
@JonasTeuwen yes, you should have a look at it :)
@MattN Not really: what does "full of typos" mean? One every ten pages or ten per page?
@tb I can't imagine Krantz letting a substandard book out. I would have to read it to see if that review is bunk or not.
@tb It depends. Would you like to have an argument about it? I can book you in for a 10 minute argument at 3 pm.
I can also book you in for 10 arguments in total, each 10 minutes.
@MattN Ow! Stop hitting me!
@robjohn I'm not hitting you!
@MattN Stop it anyway!
13:28
@MattN It sounded as if you were starting up the Argument Clinic sketch from Monty Python, sorry.
@robjohn Yes, I was. And then I was trying to argue with you about whether I had hit you or not. What would've been the correct thing to reply?
@BrianMScott I apologize if I offended you when I stated that the "i" before "e" except after "c" rule is not taught any more :-)
@robjohn I don't remember noticing that there were too many typos in there...
@MattN I'm impressed :)
@MattN Ah, sorry, the Being Hit on the Head Lessons was in there somewhere, unless I was mixing up sketches.
@robjohn It was, I think. But tell me what answer you expected from me under the assumption that I was doing that sketch.
13:32
@MattN Better, better, but "waaaah!"
@robjohn Ah yes, right. But then I would've been two characters at once.
@tb I'm not sure why but: : )
@MattN That's true, I was just sort of going chronologically rather than logistically :-)
@Skullpatrol I expect that the extent to which it’s taught varies enormously. I’m not impressed with the arguments offered against it: every one that I’ve seen ignores the fact that it’s intended to cover those cases that aren’t covered by other rules. For instance, reinforce is not a counterexample, because the ei split across a syllable boundary. Ancient is not a counterexample because ci here is a grapheme representing the \sh\ sound.
@robjohn Yes I understand now. : ) So my answer was trying to start up a second argument. : )
Never mind : )
@MattN Yes, I see that now. It makes sense, but I was stuck in the skit. That happens when you get old :-)
13:36
: )
@BrianMScott I agree the intent of a rule is very important to examine carefully before, during, and after memorization. But, alas this is easier said than done, in my opinion.
I may have a somewhat idiosyncratic view of the matter: I was always a good speller, and I internalized a lot of patterns without having to be taught them. It was always clear to me that the I before E rule was intended to cover cases not already covered by less arbitrary patterns, so I never expected it to cover some of the so-called exceptions.
People who had a harder time with spelling in general may not have picked up on what I think of as the less arbitrary patterns, so they may see as exceptions things that to me have perfectly good explanations.
VVV
VVV
13:55
Hi
@Brian: thanks for your comment on the sequential compactness question, I was seriously puzzled by the remark in the body of the question...
@BrianMScott Thank you for your point of view on the issue.
@tb I can’t believe that we’ve not dealt with this before, but I can’t find a good match. The closest is a question resolving an oversight in the proof that someone was reading.
@Skullpatrol You’re welcome. (And I get a kick out of disagreeing with Geoff Pullum. :-)
13:59
Heya!
A very short question, can one say that cos 3x is a fourier serie?
@BrianMScott I can't find a good match either. Most questions that are related seem quite a bit more advanced...
@N3buchadnezzar Are you asking if "serie" is the singular of "series"?
2
14:02
@tb I need to get some dinner, so I’m just going to wait and see whether the OP responds. Most likely it’ll all be resolved by the time I see it again! I’ll see you later, I expect.
The question i am given is: "What is the Fourier series of cos(3x)?"
My thought is that cos(3x) is a Fourier series (albeit, a very short one !)
@BrianMScott enjoy! Yes, I'm probably here for quite a bit longer...
@N3buchadnezzar yes, or $\frac12e^{i3x}+\frac12e^{-i3x}$ depending on how you do your Fourier Series :-)
"serie" is the ablative singular of "series"
@N3buchadnezzar A very short answer for a very short question :-)
14:13
@tb Yay! : )
VVV
VVV
Can anybody recommend me a book which treats the number of divisor function ??
@robjohn Did you get a chance to look at "How to Solve it" by George Polya?
@Skullpatrol I have not had a chance.
Off to the park with Lilly. bbl
@robjohn @VVV @DanMKatz @MattN @tb @N3buchadnezzar @JonasTeuwen @KannappanSampath @AsafKaragila @RajeshD @RamanaVenkata @Gigili Bye ;-)
Bye! =)
14:29
bye :-)
Bye.
Bye ...
VVV
VVV
bye
15:04
@MattN Im still around...
But I missed the message.
@tb There's a deletion open...
It wouldn't have occurred to me.
@AsafKaragila Is there?
:-)
@tb Us three are a great hitting team.
@GraceNote Are you there?
I just stepped in. What's up?
Who's the third?
15:10
Andres Caicedo.
@GraceNote I was wondering if there was any plan to give some power to the room owner besides temporarily pinning up messages.
Such as?
Banning or kicking users from rooms.
You can't kick already?
Click on Matt N. on the left here, you don't get an option to kick?
15:11
I cannot even delete messages.
Nope. That must be a diamond feature.
Huh, I was always under the impression it was an owner ability.
Delete messages I don't expect as anything short of diamond, though.
There is no ability to outright ban a user from a room, though. Even kicking is honestly rather weak.
@GraceNote I know you're kidding. : )
And, will someone tell me what kicking an user means?
@KannappanSampath No, because (among other things) kicking is actually very weak, and because of various kick shenanigans on The Bridge, I had always thought kicking was an owner ability.
Kicking just removes them from the room. They can always just rejoin.
@tb Never mind then. You asked me whether I wanted to make you blush. I must've misinterpreted that.
I mean, we have established a short list of basic chat rules, I was hoping that I could also enforce them to some extent.
15:14
@MattN Okay, never mind :)
I wouldn't want to beat a dead horse : )
@AsafKaragila I've been meaning to look at that.
@MattN Why not? It's not like the horse would feel anything.
@GraceNote Thanks.
@tb I guess if I had been you I'd've replied "Yeah, I hear it all the time." : P
(In retrospect, but like I said: no pun intended.)
@AsafKaragila rimshot
...so you guys do have a script for rendering the MathJax in chat
15:17
@MattN well, I'm sooo used to that that I don't even notice anymore...
@GraceNote Yes, we do. This is why we keep on using TeX in here. :-)
@tb : P
@GraceNote If you'd like to try, visit robjohn's profile.
@MattN I think she's reading the chat rules post, there's a link there as well.
Thanks for the offer, but I'll hold off on that for now.
Can someone tell me if this is on-topic here?
Huh.. MO works on https?
@KannappanSampath I'm not very eager to see such US centric questions, on the other hand, a big chunk of the user base is from there, so I don't think it's "too localized".
@tb My contention it is not even on-topic here. I think I can imagine a whole book written on the question.
@AsafKaragila well, if you convince your browser to accept the SE cert they have there.
15:24
@KannappanSampath well, I leave it to others to decide...
JK.
JK.
Hi, I have a question, don't know how to format it so I ask here first if anyone is interested in answing maybe one can format it on the main site?
@GraceNote: 'Ello, have a minute?
@Gigili For?
JK.
JK.
I have six sets (3,9) (3,9) (1,4) (1,7) (5,7) and (4,5): In how many ways can I choose 6 different numbers (one from each set) so that I choose six different numbers each time
@GraceNote I want to delete my account, what should I do except putting the line in my profile?
15:29
@Gigili Wot? Why?
She wants to be like Skulltroll.
No I want to be like you.
So funny.
@Gigili Uh... you'd send us an email to team+math(at)stackoverflow(dot)com requesting the deletion, and if you're courteous, you'd include in that email an explanation of why you're requesting deletion there so that I don't have to ask you directly. Also be clear to specify which accounts you want deleted, if it's more than just the account in question.
@Gigili I'm really sorry to read that... It was nice having you around here! All the best from me.
15:32
@tb She might come back. I'll nuke Matt too at some point.
There's more details to be said, but those would kinda be private so I can't really go into detail here in public chat.
@GraceNote Thank you.
@tb Thank you, same for you.
@GraceNote about requesting deletion?
@KannappanSampath More about how the process goes.
@Grace I also wanted to ask. Who has the copyrights for my answer on this site?
15:34
To the lords of the rings: Can you apply Fermat's little theorem to solve $6x \equiv_{19} 7$?
@AsafKaragila All details about licensing should be stated either in the /legal page or the CC-Wiki dealie on the bottom right of every page.
@GraceNote Yes, I read that and could not - for the life of me - understand whether or not I must credit the site when I'm published something based on my answers here.
My understanding is that we kinda... share custody, so to speak, of the answer. We can't do what-all-with-it because it's your answer, but at the same time, we reserve the right to keep it on the site after you leave because other people will find it useful.
@AsafKaragila ...isn't that material you could technically use independent of us, then?
@GraceNote: is that a new avatar, or am I just forgetful?
@robjohn This is my IT Security avatar.
15:36
@MattN Possibly, but I don't want her to leave for good without knowing that some people appreciated and enjoyed her presence thoroughly, so I'd rather play it safe...
@GraceNote Ah, like wearing a sheriff badge?
@GraceNote Well. I know that some sites would outright claim full ownership etc etc and I couldn't understand what is the situation in my case.
@robjohn She don't need no stinkin' badges!!
@AsafKaragila We own the posting on your behalf - credit to us from others using your answer is partly so that we ensure you get credit for it. But we don't own the knowledge you used to craft your answers.
Aha. Very good, then.
Because I know my advisor will disapprove any explicit links to either here or MathOverflow in my thesis.
There will probably be a footnote and an acknowledgment though.
My understanding is that as long as you aren't using our material (for example, if you took someone else's question in addition to your answer to said question), then you're just working off of your own material to begin with, divorced of its relation to being on the site.
15:40
@AsafKaragila That you should include in any case - if only to avoid any sort of plagiarism accusations...
@tb Yes. In the MathOverflow case it's a bit more crucial since the original idea came from Martin Goldstern (which he allowed me to use, so it's fine).
What I love the most about the academia that one can plagiarize themselves. That is the most bizarre thing ever.
@KannappanSampath the matter seems to be settled already :)
@tb Looks like it! : )
@JonasTeuwen I knew that
Hi Ilya.
15:44
@Matt N.: hi
phew, I've just made about 2km one way with a heavy box with exam sheets in one hand and an umbrella in the other. The rain is horrible. The wind is awful. And I've done it one way and the way around
The sun is burning down here and shining right into my face.
Want to swap weathers?
yes
I will let the sun burn in hell
Does that rain come with thunder and lightning?
15:46
the ticket to China is 1.5k
It was nice spring day here today.
@MattN no, it's called the thunderstorm. It is very rare here. It was much more often in Volgograd, especially in May. This month there is so cozy!
In Euros? That seems too expensive.
@MattN in Euros
@Ilya Where did you book it?
15:47
Is that first class???
@MattN I haven't done it yet
@AsafKaragila hi, no - Econom. It is KLM (Royal Dutch Airlines). With China Southern there is the same flight, 100 Euros lower. Maybe the service is different
Is it "Our Planes Are Made Of Solid Gold" airlines?
@Ilya Amsterdam-Beijing?
@MattN yeap
15:48
@AsafKaragila the funny thing is that they write "The Flying Dutchman" on each airplane :D
@AsafKaragila yes
@MattN: there is also a Swiss Airlines one, with a change in Zurich. It is 900-1k
@Ilya Dates?
@MattN 14th April - 20th April
@Ilya Then why do you go for the 1.5 k one? To avoid ZHR?
@MattN I haven't book it yet. I just wrote that the ticket is 1.5k. I don't want to avoid Zurich - we can meet there if you manage to pass into Duty Free Zone :)
@Ilya So you'll be offline that week?
15:50
@AsafKaragila Sure. They don't have the internet in China.
@AsafKaragila what Matt said :D
@MattN Or... he'll be busy with other things there.
@Ilya Duty Free is for passengers only : )
@MattN I know. That's why I don't think we can meet :-p
@AsafKaragila Last time on the conference I wasn't busy only from 1am till 7am. I was visiting the chat at 1am btw - and talk to you guys, who were around. But then I was to tired for long discussions
@Ilya Alcohol and hookers?
@MattN I saw that. But it is Aeroflot
@AsafKaragila Alcohol and professors
@Ilya Ewww...
@Ilya I see. If that's what you like, fine.
@AsafKaragila it is what you need when you're a PhD. so be prepared now
@Ilya Don't forget to eat all sorts of foods, such as duck tongue salad, turtles, drunken shrimp and whatnots.
15:55
It works differently in my field. We use forcing. :-D
@AsafKaragila that's so impolite :)
@MattN sometimes they are like girls: to give a loose to their tongues, you better give a drink them :) I was posting some stories about how I tried to approach some of them. I felt myself as a hunter, honestly.
@MattN maybe, didn't try it. what about you? :-p
@Ilya I am now not sure whether this sentence is talking about getting a girl or a professor.
@MattN ah, I had been away and didn't manage to delete it now
@Asaf: how are you? haven't seen you for a while
@Ilya I'm tired.
I think I'll go ahead and take a nap.
@MattN: thanks for looking for flights - but these are secretaries who will book it for me. They usually prefer the KLM-Air France group
16:01
My cat is driving me nuts. She wants to play.
@AsafKaragila shower her :) you know what to do
@Ilya Oh, then why do you even mention the price? : D
@AsafKaragila sleep well then, congrats on finishing your homework
@MattN ah, just complaining :) don't worry
Wot. I missed all of that!
16:05
"Avoid using more than one question mark unless you're texting or actively seeking to drive your reader up the proverbial wall. While writing "Don't you like popular people?????" seems emphatic, it's incorrect for all but the most informal of writing."
No one is going to answer this question?
16:20
There. Five ristrettos. Back to work! 8-).
(double ones)
@JonasTeuwen I am envious. I have no clue where I can get good coffee (caffeine)
Sleepiness. Hits.
@MattN Need more coffee!
But too much coffee makes me tired!
16:28
Then you just didn't have enough.
I feel like I've not done anything today : /
And is that the case?
I was having kopfschmerz almost the whole day. Now I have added enough fuel (coffee) to work!
@Jonas What brands of coffee do you use?
@JonasTeuwen Self-induced though! : )
@JonasTeuwen Well I've done some exercises in ring theory. But very little.
@KannappanSampath Single Estate's usually.
16:32
@JonasTeuwen Any link where I can think of buying?
No, just need to go to a good coffee roaster.
There isn't really a good brand.
Cup of Excellence is what you want.
@KannappanSampath Are you using an espresso machine?
Filter coffee can be nice, too.
We use Lavazza for that.
@MattN No, but I'd seriously want to buy one.
Lavazza UGH.
Yeah, buy the Izzo Alex Duetto. Best price/quality.
@JonasTeuwen I'd appreciate a link where I can buy/or some such. :/
16:35
@KannappanSampath A proper machine is >1000$!
>2000$.
Yes.
But then you shouldn't put Lavazza in it.
No. Lavazza is good to make filter coffee.
Hmm, too dark for that.
For filter coffee you want a very light roast.
16:36
No.
@JonasTeuwen How about this?
I like it like that. : )
As much of the flavours go away when roasting too dark.
It adds bitterness and limits the acidity.
Trust me, Lavazza is just perfect for filter coffee.
@JonasTeuwen It is a coffee maker not a espresso machine, I know.
16:37
@MattN Why should I trust you in that?
< Barista
@KannappanSampath Hario V60.
@JonasTeuwen Because you never want to make filter coffee so it doesn't matter?
Buy that for filter coffee.
I make filter coffee in several ways! V60, Clever, Aeropress!
I think the worst is sour coffee.
Depends where it comes from.
Aeropress is not nice. It's just a silly toy.
16:38
If it is espresso and the temperature is too high you will get sour coffee.
But the acidity can also come from a light roast, and in that case it is nice.
@MattN On World of Coffee it was one of the best cheap methods!
I had marvelous coffee made using Aeropress from the barista champs.
@JonasTeuwen I pour it into a French press, stew it for 2 minutes then filter it.
Et voilà.
@JonasTeuwen We have one and we never use it because the outcome is undrinkable : /
Not all coffee is suitable for a french press. I'd roast some Los Lajones quite lightly for that.
Then you probably fail at using it.
@JonasTeuwen I only like zero acidity coffee.
Bad roast, too course/fine.
Too hot/cold water.
Quite probably. : )
But since the coffee I make using the French press is just perfect it doesn't really matter.
16:41
I like it around 85 degrees celcius. Depends a bit on the coffee, can be -2/+7.
Are you a coffee Otaku?
But you didn't yet explain why I should trust your opinion on wether Lavazza is good for filter coffee.
Yes!
Are you a part of our Cooking site?
I go to the World of Coffee, maybe as a participant in the contest and otherwise as a volunteer! (it is in Vienna).
No.
I can't cook, but I can make coffee.
16:42
Well, we kinda merged the coffee brewery proposal into Cooking.
Mmmm, I know a lot of "Otaku"'s in coffee... But you already have nice forums for that.
Even if you can't cook anything else, your expertise in coffee will be appreciated ♪
@JonasTeuwen Well before you distrust me, try it yourself. Get a bad of beans, grind it at 3.5 fineness, do the French press for 2 minutes then filter.
Okay!
"3.5 fineness"? Huh?
What kind of measure is that?
@JonasTeuwen Well stores here have a grinder with a dial ranging from 1-10.
16:44
I have tried Lavazza, including blind with other coffees.
Yes, but it is non-standard.
I've seen grinders go up to 40...
@JonasTeuwen Dunno. Le-coffee measure $\lambda_{c}$.
And I would certainly not use an espresso roast as a filter coffee. Well, in some cases I might as Cafenation has very light espresso roasts 8-)!
But those Italian roasts are quite dark.
Between good quality coffees I can determine which one is Lavazza from the odour alone... Brrr.
Well previously we used Chicco d'oro but I prefer this one.
Maybe I just got used to bad coffee. But I prefer it over coffee of the day at Starbucks.
I suggest Los Lajones for filter coffee.
I have Starbucks mugs as "spit mugs" when cupping coffee.
Coffee at Starbucks was burnt, the last time I've tried.
Even the light roast is burned!
It's not nice indeed.
But I guess for people who like milk and sugar in their coffee it makes no difference.
16:50
Sugar in coffee is blasphemy. Caffe Machiatto and Cappuccino can be nice.
Lecturer congratulated me on my good exam : D
Cool! Which exam?
user image
2
Jonas, Rector Magnificus and Living Book.
: D
@JonasTeuwen Set theory.
@MattN Great. Congratulations.
@JonasTeuwen I drink Cappuccino at uni because the coffee is undrinkable without milk.
@JonasTeuwen thanks!
I have to go now. See you in a bit.
16:53
My advisor once brought me coffee from our coffee bar. I told him that it is a torture. :D.
See you!
Argh, too little blood in my caffeine system.
@Jonas Was it an award ceremony?
No.
They were talking pictures of those two guys on the right. I said: I want to be on the picture too!
So it happened as requested.
@JonasTeuwen Oh, I see. Living book is likely to be your advisor?
No, Living Book is Salah, he was telling about science in Iraq.
@JonasTeuwen I see. : )
16:57
I am much taller than the rector magnificus but he is in charge...
@JonasTeuwen I wonder if you are 7'....
@Asaf So to talk about chat enforcement - we have means for handling users who are being, well, flag worthy, but nothing short of that at the moment. Like, we don't have a means of handling a user who is rude other than flagging them, which currently reserved more for explicitly offensive material.
I'll think about what can be done on this matter for handling your chat rules.
@KannappanSampath What is that in meters?

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