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00:04
@anon Great thanks. Now I can compute my integral!
@AsafKaragila Is 290 sufficient?
and I was still 40 away from capping :-)
Nicely done.
Now three more of those!!!
GET TO WORK, YOU LAZY CINNAMON BUN!
2
Good night guys.
@AsafKaragila cinnamon bun?
00:13
@JonasTeuwen good night
00:32
Heh.
I write and write and write and write...
It seems that I won't be proving 2 out of the 5 propositions I planned on proving.
01:03
@AsafKaragila Yesterday was slow for me, too
@robjohn I'm finally preparing my notes for the seminar on Monday.
I finished the first third of the preliminary propositions and some of the proofs I might give in class (if time permits).
It's 3am and I have quite a lot more to go over.
Took me an hour and a half to cover this part, should take about two hours to finish.
I'm tired, but I have to consider two things:
1. I want to meet with my advisor tomorrow and review my notes for anything missing, so I better finish preparing before that.
2. Indeed it could take me just two hours, but if I stop it would take me a while to start again.
Then again, I'm quite tired.
@AsafKaragila work/sleep quandry...
Yes. I will quickly read the proofs I want to summarize, and then go to bed.
Arrrrggh, just read the various comments the OP left.
From each day to another I'm learning more and more what is the biggest problem of the internet: Dangerous Knowledge.
"Please explain this purely mathematical concept in a purely high-school mathematics framework! kthxbye!!!!!"
01:23
@AsafKaragila yeah, right!
@AsafKaragila Please explain Wiles' proof of Fermat's Last Theorem to our high school class... in 15 minutes or less.
I missed the spam.
Tonight at 2AM we set our clocks ahead, losing 1 hour tonight
I wonder when we do here.
@robjohn :-D
01:46
@robjohn: If you already read that link, read it again. I left more comments.
Hi Mariano.
@AsafKaragila Math for the masses.
@Mariano: I hardened up the proof you read earlier :-)
heh
I'll look later :)
@MarianoSuárezAlvarez no rush. If you have time.
02:08
One great thing coming out of these rockets...
They canceled the horrid Purim celebrations tomorrow in the university, and by golly how I hate those.
@AsafKaragila what goes on that you dislike?
I just hate big and crowdy celebrations.
It's like a Jewish Halloween with a parade.
That doesn't sound so bad.
I tend to get quite drunk and easily enraged on that day.
and you can't stay away because it is at the university where you'll be?
02:14
@anon I would rather get shot in the knee.
@anon It doesn't to me either, but I can understand people not enjoying it.
@robjohn I need to sit with my advisor tomorrow, so I have to go. Luckily, all activities were canceled! :-D
I am imagining Asaf with a Konig hat at a Purim celebration diagram chasing drunk and getting shot in the knee.
@anon there will have to be a picture ;-)
Buddy, no more diagram chases for me. kthxbye!
02:17
>that feel when you check the OP's profile to see if they haven't seen your answer yet
@anon been there, done that :-)
Okay. I am going to bed. 4:30 seems like a reasonable time.
Goodnight y'all.
night
03:03
hey, wtf is so bad about this answer: math.stackexchange.com/a/118401/22544
it's gotten 2 downvotes!
all right, i guess the few ppl in here are sleeping. i'm goin' ta bed, too
It's not a proof, it's just a graphical verification.
I imagine the second downvote was due to someone seeing the first downvote and joining in, while the first one was because someone thought you thought yours was a valid proof (which it isn't). That's my psychological extrapolation.
@Jeff ^
Question: is there a software for which one can practice/use TeX to type papers from their computer? I've only been using Microsoft Word's Equations, but that stuff is weak. I want the real deal!!
@capItan: I use MikTeX for making actual documents (you'll need to know how to do a header). Otherwise there is codecogs' live sandbox for practice and wikipedia's write-up for general reference
Also verbosus or scribtex for online latex document creation (there's no point if you can figure out miktex though).
I will look in to that, thanx :)
03:18
Miktex is the way to go CapItan
You should also check out notepadd ++
Do both apps use the same codes?
You'll be using miktex to compile your document
Notepad ++ is a great little text editor that has syntax recognition. It makes typing in a lot of parentheses easier and it also recognizes commands that are called in latex.
So those can be used together? I have some learning to do with this Tex stuff
Ah ok
What are you trying to type capitan?
Math homework?
03:22
OOH
I have a great template for you.
It's not mandatory yet, but i want to learn anyway
you two have the coolest looking autogravatars in here yet.
There is a template in there that is highly useful. I believe that it will follow most higher math homework guidelines.
@anon are you talking about me?
you two
03:24
thanx !, I will start checking that out
If you want any help let me know!
There's a full example worked out in there.
Thanks anon.
what do i need to open those files?
Ah :)
Those files are compressed
into a .zip archive
I think i need to download a mixtex before I open them
Are you talking about the .zip
?
or the .tex files?
03:26
The tex files
Does anyone have any experience with finding cluster points of sequences?
aka accumulation or limit points? real analysis no doubt.
Yes. I'm looking through a problem and have almost no idea where to start. I do have an inkling of a cluster point, however, I am not sure how to approach proving that it's the only one.
what's the sequence?
sounds like a proof by contradiction
03:29
That's what I'm supposing @anon
Define $X_n = 1 +2 +... +n$.
mind you TeX works in chat for those with the mathjax bookmarklet, as long as you put it inside $ or $$'s (see Please Read on the sidebar).
okay.
Sorry about that
no it's cool. also, you can center dots with \cdots instead of \dots.
Where is the bookmarklet?
03:33
Added all of those. Let me refresh.
That's great! Ok, back to the problem at hand.
$T:=\left\{\frac{T_m}{T_n}:m<n \in \mathbb{N}$
forgot a \right\}
$$T:=\left\{\frac{T_m}{T_n}:m<n \in \mathbb{N}\right\}$
Oh man haha
$T:=\left\{\frac{T_m}{T_n}:m<n \in \mathbb{N}\right\}$
you can edit your comments within a 5 min window, instead of reposting over and over again :)
alright, and what is $T_k$?
Sorry, I'm newer to the chatroom. I'll try and stop spamming the place.
don't worry about it
03:39
What do you mean $T_k$?
You've defined the set $T$ in terms of fractions of $T_k$'s.
We define $T_n = 1 +2 + \cdots +n$
Oh, you used $X$ last time. I thought you were going to define the $T$'s in terms of the $X$'s or something.
Apologies, I was pulling that off the top of my head
I know that this tends toward either one or zero
so basically fractions of the form $$\frac{m(m+1)}{n(n+1)} \qquad 1\le m<n $$
because $1+2+\cdots+n=n(n+1)/2$ (google "triangular numbers")
03:42
I was just about to say
So our two cancels with the denominator of the numerator and we're left with the fraction.
seems to me the accumulation points are $[0,1]$.
Let $p_n/q_n$ be a sequence of rationals in $(0,1)$ converging to $\sqrt{x}\in[0,1]$. Then $p_n(p_n+1)/(q_n\cdot(q_n+1))$ converges to $x\in[0,1]$.
Is that due to the fact that I can take and shift the point by multiplying the m and n by a constant.
Allowing me to shift it along the points in the interval.
well, "shift it" is rather vague. IMO, it's really due to the fact that the fraction is $\approx m^2/n^2$, and squares of rationals can approximate positive reals arbitrarily well just as rationals do.
I suppose I need to do some reading on approximating reals with the squares of rationals
You don't have to go out and read about it. The method is in my last comment: to approximate $x$ with squares of rationals, take a sequence of rationals approximating $\sqrt{x}$ and then square them.
03:58
How did you see that?
Working backwards. If $(\cdots, p^2/q^2,\cdots)$ converges to $x$, then $(\cdots,p/q,\cdots)$ converges to $\sqrt{x}$ and vice-versa.
 
1 hour later…
06:11
Hi
how u doin
Ok. I have a serious problem with some internet users. \
They ask random question, the words appearing in their question makes no sense to them. How do they expect to understand an answer. :/
any links
?
This and the links in my comment there should be a representative sample.
-1
Q: Figuring out how many ways to reach from one conjugacy class to another?

John SmithSay I have a list that may be out of order. For instance, the list [1,3,2,4] has 2 and 3 out of place. This would correspond to a conjugacy class of (2), meaning only one set of 2 elements is out of order (there are six ways to have a conjugacy class of (2)). My "operation" is selecting three ...

06:18
again?!?
Oh lord, that section of the Wikipedia article is awfully misleading.
@KannappanSampath I have had a similar experience trying to explain when I TAed. Some are just interested in the final nice "formula"/answer.
Yes. I wrote a comment there to the OP. I am afraid I am being rude to the chap but cannot help it. : (
I also looked at the chat room where you discussed this question further.
@SivaramAmbikasaran Awefully, if you read the OP's previous post and then trace back to his first post ever on this topic, you'd see Joriki's answer most explanatory. : (
And, the OP is not even aware of axiomatic look at groups.
Also, I wrote down an elementary group theory answer on conjugacy action, that requires minimal prerequisites and I'm pretty sure OP has not gone through them as well.
My experience with students, when I TAed is, not to throw new terminologies at them. Rather work along with them to motivate the procedure and finally tell them this can be done in a more general setting.
06:30
@Kanna: It's ultimately a word metric problem. The generating set is the set of permutations with cycle type (ab)(cd)(ef) (all letters distinct), specifically.
However, I do accept that, over the internet, it becomes difficult to work along with the other person and motivate the procedure.
@anon Please write it up for him, then. Let good be upon you for having figured this out. : )
@SivaramAmbikasaran How is CA doing? =)
actually I think that's not the right way to characterize the generators. anyway I'm writing a comment, though it's not an answer.
@KannappanSampath Just brushing up rings and ideals still in chapter 1. I am a slow learner =)
@SivaramAmbikasaran Hah, so am I. I am still in chapter 1 too. : )
06:35
@KannappanSampath: Sometimes I get too stuck upon the details
which prevents me from making progress at a good pace
and all this in between my research and deadlines :)
woohoo cap. now I don't have to pay attention to mse until tomorrow :)
This happens with me in Analysis too often. But, that is one reason, I remember things clearly, in Analysis. :-)
what all courses have you done at ISI so far?
And you are still in your first year right?
@SivaramAmbikasaran Yes. Sure.
06:41
@SivaramAmbikasaran Analysis on real line and metric spaces(Ongoing: Riemann Integrals.) ; Groups, Rings and linear algebra(ongoing: Linear Algebra); Probability Theory.
@SivaramAmbikasaran That was the reply to the second half, required a shorter answer and hence wrote that first. Sorry if it was confusing.
ok np. nice set of courses in first year!
Is it a semester system in ISI?
@SivaramAmbikasaran If I may ask you, have you read some of my answers here? Have any generic comments to make of the style?
@SivaramAmbikasaran Yes, it is semestral. So, we have had one semester and this is my second semester.
I am not an expert at presenting (or) writing. Of some of your answers I have read, I think your presentation style is overall good.
06:52
Hi Daniil
07:07
@KannappanSampath Can you come over to the CA chat room?
@SivaramAmbikasaran Sure. Sorry had to go away to a shop. :-\\
08:01
folks !
08:38
Morning.
Morning Matt.
Hi Kannappan.
Guten Morgen.
Hello Asaf.
@MattN Did you see we discussed some theory at CA room? I am afraid I might have made some wrong statements.
08:40
@KannappanSampath I'm just looking at it : )
@Matt: why so early? ahhhhh
sleepy -_-
@AsafKaragila In this post of yours there are a few typos (you tend to skip words) and one special grammar mistake that I've seen you make repeatedly. The reason I am even mentioning it is because it makes your posts a lot harder to understand.
@Ilya I went to bed at midnight and slept til 9.30, the girlfriend is still sleeping : D I think 9.5 hours is a good night of sleep.
@MattN I'd love to hear your comments. I just should mention that robjohn read it and had no remarked, I assume he's a native English speaker too... perhaps he didn't mind the mistakes.
@Matt: are you a native English speaker?
@AsafKaragila I assume he didn't point it out. But I'm not sure why.
08:49
(that's not the question which I wanted to ask you, but thanks to Asaf, he has shifted my attention)
(I'm clever that way)
@MattN that's how we realize that Rob is not a native English speaker, hence he is possibly a Spy!!!111oneoneone
So here we go (that's the special grammar mistake): In the first sentence you write "I think that first we need to review what is the axiom of choice, and what can happens in its absence."
Can you spot the wrong word order?
A Russian spy!
: D No I'm not an English speaker.
can happenS is not about the order, but anyway
Well yes.
Yes. Thank you, Kannappan.
08:51
@MattN where is his cookie?
But Asaf was supposed to find it himself : (
@Ilya gives carrot to Ilya & Kannappan
@AsafKaragila Did you see that?
I am sure he'd not have seen that. : )
Ok : )
We are not bloody Donkeys! tu-tum-tu-tum, tu-tum-tu-tum
We don't need your carrot control! tu-tum-tu-tum, tu-tum-tu-tum
(on the music of Another Brick in the wall)
Listen, I gotta go to the office now. Could you compile a list instead of leading me through a torturous "find your own mistakes, I'll just spot them for you" game, since I really have to finish the seminar preparations today...
I'll be on keyboard in about 25 minutes or so. Emails are fine too.
08:52
@AsafKaragila I didn't mean to torture you. I wanted you to learn something from it.
But ok.
I have a very different method of learning.
I'll email you a list.
@KannappanSampath Sorry, I'll go right back to CA. That was some unexpected distraction.
I think Asaf took it the wrong way, but, its fine. He is after all Asaf. : )
@MattN Sure. : )
No, I took it just fine. I'm just preoccupied for the better part of the day.
Well. See you later.
No, I think he didn't. He just had to go. But I really think it would've been much better for him if he'd gone over it with me.
Later Asaf (beat me to it)
08:55
@MattN CA isn't California in this case, is it?
@Ilya No. : ) Commutative Algebra.
09:10
Morning.
Ello teddy : ) Did you sleep well?
(I hear churchbells but only just about, they're quite far away.)
Animal assault. Monkies tried to enter my room. Holy crap monkies. : (
: O
Ew. They're probably filthy and full of diseases.
Yes, I with the help of few others after a bit of trying drew them away. : /
Read: just drew them away.
What kind of monkeys?
09:14
Holy ones.
I thought holy crap ones.
Right.
Well, these are not exotic ones.
09:27
Can someone fix this one for me please:
"It is possible by inspecting every pair individually we can distinguish between its two elements, and so by inspecting finitely many pairs we can still choose one from every pair."
I don't understand your request.
It's not grammatical. Can you turn it into a grammatical sentence without changing the meaning?
Something like "It is possible for us to distinguish ... blah blah".
Hi folks
I think I have it: "By inspecting every pair individually it is possible for us to distinguish ..."
: )
@tb : let me know if you are a liitle bit free........I'd like to continue explaining my argument (the text in that answer is not clearly written, I know and i need to explain what i was trying to say there)
09:34
I don't know why OP and I get different answers.,Can someone check this integration.
In a sec.
@RajeshD As I said, I don't understand:
> The minimum value of $n$ = sum of, the number of times $f_1$ is differentiable at $\tau-x$ and the number of times $f_2$ id differentiable at $x$, $\forall x \in (0,1)$.
@Kanna: Did you see yohBS's comment?
@anon Holy, he is given F not f!!!! Argh.
:D
09:39
@tb : (typing)
I'll be back in a while
@anon If it was $f$, am I right in calculations?
@Kanna: Wouldn't the inner integration be $\int_y^t$ after the variable change, not $\int_0^t$? I see no utility in change-of-var anyway.
@AsafKaragila +1 for your socks post : )
@anon Oh. Yes. So, I'll throw that to the gutters then. Also, OP has also evaluated it wrongly even if that was a density don't you think?
09:45
Yes, I do think.
I'm typing up an answer @Kanna.
@anon I am fixing that answer because, I don't want to have many deleted answers. :/
Why not?
@tb : There i was trying to designate 'n' to a specific property of the function $f_3$ at a specific point $tau$. I just now found that there is lot of grammatical mistake in this sentence, and it is not conveying what i intended to say at the first place ...(to be continued)...
What I don't understand is that you want to know how often $f_3(\tau)$ is differentiable in a given point $\tau$ if I read you correctly. However, the condition you state depends on the variable you're integrating over.
@anon: Have you seen Where is number theory used in the rest of mathematics? on MO? I thought you might be interested.
@t.b. Cool, I don't go on MO that often, thanks.
@Kanna: If you're going to do your answer for general $t$, you might want to split into cases $t\le 1$; $1<t\le 2$; $2<t\le 3$.
09:59
Oh, sure. Just realised that. :-)

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