Search found 83 matches

by xepher
Thu May 20, 2010 12:35 pm UTC
Forum: School
Topic: What's Cool To Do With A Physics Degree?
Replies: 10
Views: 2771

Re: What's Cool To Do With A Physics Degree?

Quantitative analyst perhaps? It can be a very successful job.
by xepher
Wed May 19, 2010 7:42 pm UTC
Forum: Mathematics
Topic: problem with induction.
Replies: 8
Views: 1272

problem with induction.

I've always had a problem with induction proofs. I don't have a problem in doing them, but in how they are formed. First, one has a situation where the proof is true. I get that. The problem is when one assumes it is true. Isn't that circular logic?
by xepher
Wed May 19, 2010 7:25 pm UTC
Forum: Mathematics
Topic: Probably very easy to answer this
Replies: 7
Views: 1452

Re: Probably very easy to answer this

.9999...=1. So... you said you were in algebra 1? That's great! Someone your grade looking at stuff like this outside of the class curriculum? Very good. This is the kind of subject that has to do with limits, infinitesimals, etc. Limits are probably the most important part of calculus (well, includ...
by xepher
Wed May 19, 2010 1:04 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 0742: "Campfire"
Replies: 59
Views: 21855

Re: "Campfire" Discussion

rwald wrote:Even scarier is if the killer's IP address is 127.0.0.1.

So... I googled it, and its apparently a loopback address. I'm not totally sure what that means, but from what I garnered, it apparently means that you yourself would be the killer a la twilight zone? Or is the killer just clever?
by xepher
Tue May 18, 2010 8:22 pm UTC
Forum: Mathematics
Topic: evaluating a certain integral.
Replies: 6
Views: 905

Re: evaluating a certain integral.

This integral function is called the logarithmic integral function , and to my knowledge, there is no easy way of evaluating it; you need to use a series expansion... ...and even then, you won't get a very friendly expression. If you do a Taylor expansion from some known point on the desired side o...
by xepher
Mon May 17, 2010 8:15 pm UTC
Forum: Mathematics
Topic: evaluating a certain integral.
Replies: 6
Views: 905

evaluating a certain integral.

Not homework. I did some research on the prime number theorem (as in read other sources) and I hear that the integral of 1/ln(x) from 2 to x is a good approximation from the prime counting function. My question is how I could evaluate this integral so that I can easily calculate it. I've tried u-sub...
by xepher
Mon May 10, 2010 6:24 pm UTC
Forum: Mathematics
Topic: How many formulas are there that only produce prime numbers?
Replies: 12
Views: 2250

Re: How many formulas are there that only produce prime numb

pi(x) can produce primes (the prime counting function) =P Something pretty close to that function is called the log integral formula. Sure, there are a few difference in between the two functions, but in general, they're really quite close. The difference between the two formulae (the Prime Counting...
by xepher
Fri May 07, 2010 2:53 pm UTC
Forum: Mathematics
Topic: Continuity of a derivative
Replies: 7
Views: 2919

Re: Continuity of a derivative

gmalivuk wrote:That's not a counterexample, because that function isn't differentiable on any interval containing zero.

Oh doy. I misread the question.
by xepher
Thu May 06, 2010 2:20 pm UTC
Forum: Mathematics
Topic: Continuity of a derivative
Replies: 7
Views: 2919

Re: Continuity of a derivative

I'm still in precalc, but I'm pretty sure this is a counterexample

|x|=f(x).
the derivative doesn't exist at 0. So, on an interval [-1,1], the derivative at point 0 is undefined.
by xepher
Wed May 05, 2010 12:33 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 0736: "Cemetery"
Replies: 52
Views: 15049

Re: "Cemetery" discusstion

Zhatt wrote:At first I thought this was about some sort of ultimate revenge: a comic-sans engraving on your most hated typographers tombstone.

Same here.
by xepher
Tue May 04, 2010 9:03 pm UTC
Forum: Books
Topic: Worst/Overrated books.
Replies: 753
Views: 285366

Re: Worst/Overrated books.

On the subject of Lord of the Rings, how many people outside of me were tired of having the "it's an allegory for WWII" crap being shoved down their throat?
by xepher
Tue May 04, 2010 8:27 pm UTC
Forum: Gaming
Topic: Mega Man 10
Replies: 12
Views: 1510

Re: Mega Man 10

Well, to be fair, I could see them doing Mega Man in 3D well, by making it a cross between old-school Mega Man, and Metroid Prime. And no, the Legends series do NOT count: They are games that have Mega Man, yet are not "Mega Man Games" :P Mega Man SOCCER is more of a Mega Man game than Le...
by xepher
Mon May 03, 2010 2:10 pm UTC
Forum: Mathematics
Topic: Need some understanding.
Replies: 13
Views: 2007

Need some understanding.

I've been reading through a calc book for a while, and I'm having trouble understanding two things: the law of the mean and L'Hopital's rule. I don't get either of them.
by xepher
Mon May 03, 2010 1:34 pm UTC
Forum: Gaming
Topic: Touhou!
Replies: 141
Views: 34833

Re: Touhou!

So... how about the music?

Personally, my favorites are Cosmic Mind and Voyage 1970.
by xepher
Mon May 03, 2010 1:23 pm UTC
Forum: Music
Topic: Perfect Moments In Music
Replies: 396
Views: 204229

Re: Perfect Moments In Music

Although it is video game music, Voyage 1970 by ZUN is just... It blew me away, having not heard it outside of the game before. Imagine, beating the final boss, believing your trouble is over, then this music plays, preparing you for their very last stand. The beginning caught me off guard, and I di...
by xepher
Mon May 03, 2010 1:01 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 0735: "Floor"
Replies: 87
Views: 21048

Re: "Floor" Discussion

00Davo wrote:And here I was expecting some form of convection shielding. The stuff's molten rock. Convection will have fried the poor kids almost instantly. :(

http://tvtropes.org/pmwiki/pmwiki.php/M ... monvection
I think they'll survive.
by xepher
Fri Apr 23, 2010 6:17 pm UTC
Forum: Mathematics
Topic: Where am I on the curve?
Replies: 33
Views: 3896

Re: Where am I on the curve?

The main reason I'm asking is because I'm interested in mathematics to a great extent, and when I see certain terms such as the epsilon-delta kind of definition, I become a bit worried about where I am. I wonder how I'll do in Calculus, and then I find myself asking questions about this. ...That bei...
by xepher
Fri Apr 23, 2010 5:55 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 0030: "Donner"
Replies: 10
Views: 6650

Re: "Donner" Discussion

LOL. I didn't get it at first, but now I remember.
by xepher
Fri Apr 23, 2010 5:55 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 0731: "Desert Island"
Replies: 119
Views: 29762

Re: "Desert Island" Discussion

Why I am the only one who is reminded of those iSpy books from the alt text?
by xepher
Thu Apr 22, 2010 12:24 am UTC
Forum: Mathematics
Topic: Where am I on the curve?
Replies: 33
Views: 3896

Where am I on the curve?

As a tenth-grade student, I've been interested in math for a long time, and I want to know if I'm ahead. I'm pretty sure I'm ahead of my class, but I don't know how I stand up with other people near my grade level. How could I go about finding how I measure up to others? I currently take precalculus...
by xepher
Thu Apr 22, 2010 12:12 am UTC
Forum: Mathematics
Topic: Division by Zero (Please, no new threads about this)
Replies: 367
Views: 85494

Re: Division by Zero (Please, no new threads about this)

sigh... this is silly. 1: Division by zero is an invalid operation, for any numerator. 2: That being said, if it was, then all real numbers would equal each other. If you had 0 friends and 0 apples to share with them, you could give them as many apples as you want because no matter how many apples y...
by xepher
Tue Apr 20, 2010 12:49 pm UTC
Forum: Mathematics
Topic: 3rd degree "conics"?
Replies: 1
Views: 504

3rd degree "conics"?

In precalc, our class has been recently going over the different conic sections. What I'm curious about is that the kinds of equations we're studying are from second degree polynomials. What would 3rd degree polynomials with similar equations yield?
by xepher
Thu Mar 25, 2010 6:57 pm UTC
Forum: Language/Linguistics
Topic: Your and You're
Replies: 66
Views: 6574

Re: Your and You're

Hopefully, this won't go off on a tangent. The main point I want to make is... why would people use your instead of you're all the time when you're is grammatically correct? Is this just laziness? Because I believe that it wouldn't take much effort to input an apostrophe and an e. How many people a...
by xepher
Wed Mar 24, 2010 1:29 pm UTC
Forum: Language/Linguistics
Topic: Your and You're
Replies: 66
Views: 6574

Your and You're

Hopefully, this won't go off on a tangent. The main point I want to make is... why would people use your instead of you're all the time when you're is grammatically correct? Is this just laziness? Because I believe that it wouldn't take much effort to input an apostrophe and an e. How many people ar...
by xepher
Mon Mar 22, 2010 1:32 am UTC
Forum: Language/Linguistics
Topic: Three word rant.
Replies: 7
Views: 1555

Re: Three word rant.

Actually I was moreover just mentioning my irritation whenever someone uses your instead of you're. I mean, can't they even put in the effort to include an apostrophe and an e? But oh well.
by xepher
Mon Mar 22, 2010 12:10 am UTC
Forum: Language/Linguistics
Topic: Three word rant.
Replies: 7
Views: 1555

Three word rant.

Your isn't you're.
by xepher
Sat Mar 20, 2010 2:24 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0716: "Time Machine"
Replies: 112
Views: 24303

Re: "Time Machine" Discussion

Alt. Text was a bit... redundant in a way. We already "get it". Anyway, I believe that if time travel is possible, then the universe splits into different branches depending on what happens in the next instant or if someone time travels, etc.
by xepher
Fri Mar 19, 2010 1:49 pm UTC
Forum: Mathematics
Topic: Adding Big O?
Replies: 6
Views: 1170

Adding Big O?

Apparently, the prime number theorem states that pi(x)=Li(x)+O(xe^(-a*sqrt(ln(x)))
How is this possible? Aren't there multiple Big Os of every function?
by xepher
Thu Mar 18, 2010 12:40 pm UTC
Forum: Music
Topic: [NO LYRICS ALLOWED]Instrumental Music Thread
Replies: 45
Views: 10103

Re: [NO LYRICS ALLOWED]Instrumental Music Thread

Pretty much anything from the playlist "touhou unplugged/classic (merlin)". Very few exceptions to any lyrics. The only exception I know of is just some latin voices. Trust me, it's good. I don't really have any link because I'm at school right now (lol, youtube is blocked but not xkcd. Ma...
by xepher
Wed Mar 17, 2010 6:06 pm UTC
Forum: Gaming
Topic: Touhou!
Replies: 141
Views: 34833

Re: Touhou!

I was playing around in Double Spoiler and I just pulled off the MOST RIDICULOUS DODGE EVER by pure accident. I thought I fucked myself but then I thought "What the heck, I'll try sneak out of this somehow" and I DID IT. I had to play conservatively for the rest of the card because I was ...
by xepher
Wed Mar 17, 2010 6:04 pm UTC
Forum: Gaming
Topic: How did you discover video games?
Replies: 49
Views: 6639

Re: How did you discover video games?

I'm not totally sure if I had any video games prior to this (outside of "edutainment" games, of course), but I definitely remember my N64. The first two games we got on it were... Pokemon Stadium 1 and some game that I don't remember. I remember a few favorites of mine, like Mischief Maker...
by xepher
Wed Mar 17, 2010 12:33 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 0715: "Numbers"
Replies: 185
Views: 52880

Re: Numbers

shoelessschuler wrote:Do I seriously have to drink 9 glasses of water a day? :(

I remember hearing somewhere that about either 33% or 60% comes from food you eat. Well, it depends on the diet. Hence the drastic change in which one it was.

So... not as much as 9, considering the diet.
by xepher
Mon Mar 15, 2010 2:17 pm UTC
Forum: Mathematics
Topic: Happy Pi Day!
Replies: 12
Views: 1784

Re: Happy Pi Day!

6*sqrt(zeta(2))
Where zeta is defined as the Riemann Zeta Function.
Also, I wish there was an e day... too bad there's a 7.
by xepher
Mon Mar 15, 2010 2:01 pm UTC
Forum: Gaming
Topic: Touhou!
Replies: 141
Views: 34833

Re: Touhou!

I don't get the big no either. I am actually at stage 5 already :P It's not as hard as shoot the bullet from my perspective.
by xepher
Sun Mar 14, 2010 11:49 pm UTC
Forum: Gaming
Topic: Touhou!
Replies: 141
Views: 34833

Re: Touhou!

Spoiler Spoiler. 12.5 is OUT.



ACTUAL SPOILER:
Spoiler:
It has a new character. Her name is Hatate. She's another journalist. She is also the "spoiler level" boss. You can play as her when you get all the spell cards up to spoiler level.
by xepher
Fri Mar 12, 2010 4:17 pm UTC
Forum: Mathematics
Topic: Of Hypercubes and Tesseracts
Replies: 29
Views: 4063

Re: Of Hypercubes and Tesseracts

Not sure how a fourth SPATIAL dimension works; I don't exist in four dimensions. I will say that from what it looks like, 4 dimensional figures are made by drawing lines to another three dimensional figure of the same properties, hence why they look like so. But as for how things move and all, I'm n...
by xepher
Fri Mar 12, 2010 3:57 pm UTC
Forum: General
Topic: Logical fallacies/douchebaggery in commercials.
Replies: 4973
Views: 762540

Re: Logical fallacies/douchebaggery in commercials.

Considering the thread has gone on for 76 pages, someone's already mentioned evony, I'm guessing. Yeah... no explanation needed.
Also, Antidepressants may cause suicidal thoughts. What.
by xepher
Thu Mar 11, 2010 6:13 pm UTC
Forum: Coding
Topic: Coding Newbie
Replies: 12
Views: 1695

Coding Newbie

I'm thinking about learning forms of code, and I was wondering what kind of code I should start with.
by xepher
Wed Mar 10, 2010 1:52 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 0708: "Sex Dice"
Replies: 93
Views: 36912

Re: "Sex Dice" discusion

Next Panel: the castle guard slaps him and calls him a perv, dealing heavy damage AND lowering his self-esteem.
by xepher
Tue Mar 09, 2010 8:16 pm UTC
Forum: Mathematics
Topic: Understanding Cauchy?
Replies: 12
Views: 1689

Re: Understanding Cauchy?

Good point; I should have a bit more of a formal understanding of calculus and real analysis before working on this. The problem, however, is that I'm stuck in precalc when I feel very confident moving forward in my math. They're taking a month or two working with the trig functions (analyzing and ...

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