Search found 732 matches

by the tree
Thu Jun 03, 2010 9:28 pm UTC
Forum: News & Articles
Topic: Women Lie More Than Men
Replies: 141
Views: 15488

Re: Women Lie More Than Men

Almost like some kind of hand operated puppet?
by the tree
Thu Jun 03, 2010 9:06 pm UTC
Forum: Mathematics
Topic: Math: Fleeting Thoughts
Replies: 434
Views: 161329

Re: Math: Fleeting Thoughts

Eebster the Great wrote:It seems trivial to me. [imath]v \cdot v = v^2 \ge v \cdot w = v^2 cos \theta[/imath].At least given the relevant conditions.
Yeah, it was trivial once I'd got it, hence the thought being fleeting.
by the tree
Thu Jun 03, 2010 4:14 pm UTC
Forum: Mathematics
Topic: Math: Fleeting Thoughts
Replies: 434
Views: 161329

Re: Math: Fleeting Thoughts

Yeah, for a bunch of conditions. All I needed was to say a 2 +b 2 +c 2 > ab+bc+ca | for all a,b,c in R + . And I thought of using vector notation to do it in general rather than trying to attack that specific case, since that'd have gotten messy - turns out that vectors are actually kind of useful s...
by the tree
Thu Jun 03, 2010 3:17 pm UTC
Forum: Mathematics
Topic: Math: Fleeting Thoughts
Replies: 434
Views: 161329

Re: Math: Fleeting Thoughts

Am I correct in thinking that | v |=| w | => v . v > v . w ? It seems intuitive, and that it should be a consequence of the triangle inequality but I can't quite derive it. Edit: oh, I got it, it actually follows from the definition of the dot product as in cosines and stuff. Well, that's handy.
by the tree
Wed Jun 02, 2010 1:08 pm UTC
Forum: Mathematics
Topic: NUMB3RS Parody
Replies: 25
Views: 5485

Re: NUMB3RS Parody

I wonder who kept the show on for six years. I can't imagine it was popular among people who don't understand math, but it also seems like those that do understand math find it pretty silly. I study maths and my house mate studies forensic science - we both very much enjoy watching television for t...
by the tree
Sat May 29, 2010 2:36 pm UTC
Forum: Mathematics
Topic: Wish I had seen/understood this comic sooner...
Replies: 36
Views: 4767

Re: Wish I had seen/understood this comic sooner...

I hear all kinds of stupid facts about the human body, like the we-only-use-10%-of-our-brain myth As a biology major, I do often wish a swift and violent death to the peddlers of this absurd notion. I wonder where it came from. Presumably it either came from an innocent misunderstanding like the ar...
by the tree
Thu May 27, 2010 11:32 am UTC
Forum: Mathematics
Topic: From Logic to Math
Replies: 4
Views: 1295

Re: From Logic to Math

Logic can really often be a starting point in of itself - formal logic is usually taught as part of first year philosophy without much background. But it sounds like your beyond that point and have already done more advanced stuff than that. Set theory is very much tied in with mathematical logic, a...
by the tree
Tue May 25, 2010 7:50 pm UTC
Forum: Mathematics
Topic: Given a set of numbers find a function that generates them
Replies: 7
Views: 1912

Re: Given a set of numbers find a function that generates th

In fact, their are so many functions that the problem isn't finding one, it's finding one that suites your needs among many good candidates. This in particular, you could define a function as equal to certain values at certain values and undefined everywhere else - that'd solve the problem as state...
by the tree
Tue May 25, 2010 4:48 pm UTC
Forum: News & Articles
Topic: Women Lie More Than Men
Replies: 141
Views: 15488

Re: Women Lie More Than Men

"Yes, of course she is." slathered in sarcasm with a garnish of irony, to the point where she has no idea what I'm actually communicating other than an intense dislike of being asked that style of question. Or I just tell the truth. Generally if I get any question I don't want to answer t...
by the tree
Tue May 25, 2010 4:37 pm UTC
Forum: News & Articles
Topic: 14 years in jail for being gay
Replies: 50
Views: 5944

Re: 14 years in jail for being gay

Transphobia is a result of homophobia. If the latter disappears, the former will too. Bullshit. There's a lot more to gender identity than whom you like to fuck. It's not like the two are completely separate issues though - whom you like to fuck often comes down to gender identity and overall both ...
by the tree
Fri May 21, 2010 2:06 pm UTC
Forum: General
Topic: REALLY Annoying Misconceptions
Replies: 4059
Views: 378320

Re: REALLY Annoying Misconceptions

Amie wrote:Fact: Actually, most religious people I know are very kind, harmless, docile beings that don't bite and I happen to be best friends with some of them.
I have definitely been bitten by religious people before.
by the tree
Fri May 21, 2010 1:44 pm UTC
Forum: Mathematics
Topic: Expected value of a function
Replies: 4
Views: 1119

Expected value of a function

Suppose that X has a distribution with mean \mu and standard deviation \sigma . Let a random variable Y be defined as Y=g(X) where g(\cdot) is a continuous function. Show that \mbox{E}(Y)\approx g(\mu) + \frac{1}{2}g''(\mu)\sigma^2 and obtain an appro...
by the tree
Sun May 16, 2010 3:36 pm UTC
Forum: Mathematics
Topic: Trig
Replies: 14
Views: 2367

Re: Trig

I was taught it as "Some Old Hag Cut All Her Teeth On Apples". If anyone could sort of explain everything there is to be known on the subject, that'd be pretty sweet. The thing is, that's kind of a lot and we don't know your specific syllabus. Without knowing where to stop we could either ...
by the tree
Thu May 13, 2010 3:26 pm UTC
Forum: Mathematics
Topic: Assignment help! (functions, complex numbers)
Replies: 4
Views: 783

Re: Assignment help! (functions, complex numbers)

Please, if anyone can help. Here are the questions: 1.) If f(f(x))=4x+9, find f(x). By analysis and some trial and error, I got 2x +3. Basically I just think of 2 ( ______ ) + 3. My problem is, I can't show my solution mathematically or algebraically. If f(x)=2x+3 then f^{2}(x)=2 f&...
by the tree
Sat May 08, 2010 8:46 am UTC
Forum: Religious Wars
Topic: headphones vs. speakers
Replies: 38
Views: 12838

Re: headphones vs. speakers

I use headphones usually to not disturb others I find this works both ways. If someone is having a really boring conversation in the next room then headphones (even when they are not of the noise cancelling variety) help block it out. Speakers would only be able to do that if they were giving out c...
by the tree
Sat May 08, 2010 8:26 am UTC
Forum: Mathematics
Topic: HW Help: Orthogonal Complement
Replies: 7
Views: 714

Re: HW Help: Orthogonal Compliment

Somehow I originally read 'show' as 'know'. But yes I can totally do that and will include it. Thankyou all again.
by the tree
Fri May 07, 2010 7:31 pm UTC
Forum: Mathematics
Topic: HW Help: Orthogonal Complement
Replies: 7
Views: 714

Re: HW Help: Orthogonal Compliment

Then the orthogonal complement of W is the set of all vectors u such that u is orthogonal to each vector in B. (If you already know this, great. If you don't, you should show it.) Right, I was going on the definition that the orthogonal compliment to W should be all vectors orthogonal to all vector...
by the tree
Fri May 07, 2010 5:36 pm UTC
Forum: Mathematics
Topic: HW Help: Orthogonal Complement
Replies: 7
Views: 714

HW Help: Orthogonal Complement

If I have a basis [imath]B[/imath] for [imath]W \subset V[/imath], and I want to find [imath]W^\bot[/imath]. Would it be sufficient to show that all of [imath]B[/imath] is orthogonal to all of [imath]W^\bot[/imath]? It looks like that's what the question is hinting at (the previous question was to show that [imath]B[/imath] was a basis for [imath]W[/imath]) but I wasn't sure that'd work.
by the tree
Fri May 07, 2010 4:08 pm UTC
Forum: Mathematics
Topic: Statistics Research Paper
Replies: 17
Views: 4400

Re: Statistics Research Paper

Maybe I'm giving the OP too much credit, but is it possible that the very point of placing the survey here is to demonstrate the bias that so many have expressed concern about? That could be the case, they could be posting the same survey in a variety of different forums. Does the googlewhatsit all...
by the tree
Fri May 07, 2010 4:04 pm UTC
Forum: Mathematics
Topic: Algebraic Numbers
Replies: 8
Views: 1919

Re: Algebraic Numbers

Cool. Is there a general way to prove that a number's polynomial is minimal? (substitute in terminology that makes sense)
by the tree
Fri May 07, 2010 12:53 pm UTC
Forum: Mathematics
Topic: Algebraic Numbers
Replies: 8
Views: 1919

Re: Algebraic Numbers

You can always do this kind of thing to find a polynomial, so numbers you get by writing integers and using +, -, *, /, and nth roots are always algebraic. This doesn't work the other way, though (ie not every algebraic number can be written in this way). I was literally about to ask for an example...
by the tree
Mon May 03, 2010 11:53 am UTC
Forum: Mathematics
Topic: Statistics Research Paper
Replies: 17
Views: 4400

Re: Statistics Research Paper

Velifer wrote:The population in the survey frame isn't particularly well-defined (anyone who sees his link) and the respondents will be those who choose to click through AND complete the survey. That's not gonna be anywhere near random, even within the sampling frame.
Again, is that worse than most opinion polls?
by the tree
Mon May 03, 2010 10:32 am UTC
Forum: Mathematics
Topic: Statistics Research Paper
Replies: 17
Views: 4400

Re: Statistics Research Paper

I've only taken one AP Stats course so correct me if I'm wrong but, doesn't this create a survey bias? Not much more than any other survey. And there's no definite reason why specifically reading xkcd would introduce that bias, unlike if the questions were about how people use the Internet or their...
by the tree
Thu Apr 29, 2010 10:49 am UTC
Forum: Mathematics
Topic: Mathematics or Statistics degree (Poll)
Replies: 7
Views: 1275

Re: Mathematics or Statistics degree (Poll)

I am doing a degree in maths but right this second I am procrastinating on stats revision because I hate it hate it hate it hate it hate it.
by the tree
Fri Apr 23, 2010 8:52 pm UTC
Forum: Mathematics
Topic: No non-zero eigenvectors?
Replies: 1
Views: 2010

No non-zero eigenvectors?

I've got systems of two differential equations, and am calculating the eigenvalues of a matrix representing them so as to characterise the phase plane (complex eigenvalues => spiral, etc). But in one case the characteristic equation only has roots at zero - implying that there aren't any eigenvector...
by the tree
Tue Apr 20, 2010 1:35 pm UTC
Forum: General
Topic: ITT: We make xkcd slightly worse.
Replies: 8673
Views: 1861198

Re: ITT: We make xkcd slightly worse.

Zohar wrote:Oh wow that is pretty hellish, and such a game could happen (if the pieces are just randomized).
I am fairly sure they aren't.
by the tree
Mon Apr 19, 2010 10:00 pm UTC
Forum: Mathematics
Topic: Dot Product Applications
Replies: 19
Views: 7210

Re: Dot Product Applications

Yeah, I always took it as the "standard" for vectors, obviously it's not the only one. That makes them synonymous in the same way that 'plates and bowls' is a synonym for 'crockery'.
by the tree
Fri Apr 16, 2010 11:59 am UTC
Forum: School
Topic: Awesome Student Quotes
Replies: 870
Views: 224498

Re: Awesome Student Quotes

Teacher: You got a 40 on your test. Student: Did that affect my grade? LOL, did someone really ask that? Is it, like, unusual that the outcome of tests affects grades? Depending on the course, it can be fairly unusual. Many tests are just there to indicate how you're doing before you come to an exa...
by the tree
Fri Apr 16, 2010 11:55 am UTC
Forum: Mathematics
Topic: What do you do with that?
Replies: 12
Views: 1983

Re: What do you do with that?

Also, Maths is kind of the English of the sciences, it's good for most everything - but not much in particular.
by the tree
Thu Apr 15, 2010 10:27 pm UTC
Forum: General
Topic: UK election- GREAT SCOTT, IS THAT AN ELEPHANT?
Replies: 514
Views: 42224

Re: UK election- GREAT SCOTT, IS THAT AN ELEPHANT?

Hi, call me Dave. I went to Afghanistan to talk to a Northern black one-legged Jewish lesbian soldier nurse teaching kids...' I think you need to add the word cancer about 20 times to that statement after the healthcare question...I lost track of how many times Cameron said it. He also seemed to be...
by the tree
Thu Apr 15, 2010 8:54 pm UTC
Forum: General
Topic: UK election- GREAT SCOTT, IS THAT AN ELEPHANT?
Replies: 514
Views: 42224

Re: UK election- GREAT SCOTT, IS THAT AN ELEPHANT?

My favourite of the gajjilion tweets I've read this evening:
@haroon7: wrote: Hi, call me Dave. I went to Afghanistan to talk to a Northern black one-legged Jewish lesbian soldier nurse teaching kids...'
by the tree
Wed Apr 14, 2010 10:41 am UTC
Forum: School
Topic: "When am I going to use this?"
Replies: 127
Views: 23380

Re: "When am I going to use this?"

Here are some consumer problems (and thus have wide applicability). [...] Some of those are really, really difficult though. And most people survive not really bothering with them. Oh, I didn't realize the goal was "survival". By survive I meant be fairly healthy for a reasonably long lif...
by the tree
Wed Apr 14, 2010 10:21 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0727: "Trade Expert"
Replies: 172
Views: 45739

Re: “Trade Expert” discussion

What people seem to forget is that outside of computers, there is no such thing as a backslash: it doesn't mean anything in terms of actual punctuation. It's just a strange character that somehow popped into existence for a reason nobody can quite remember. The most annoying is when people use back...
by the tree
Wed Apr 14, 2010 9:05 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0727: "Trade Expert"
Replies: 172
Views: 45739

Re: “Trade Expert” discussion

However, broadcasters are always saying 'forward slash', which irritates the hell out of me. It's a SLASH, that's what it is: you don't have to clarify it with forward. What people seem to forget is that outside of computers, there is no such thing as a backslash: it doesn't mean anything in terms ...
by the tree
Tue Apr 13, 2010 3:25 pm UTC
Forum: School
Topic: "When am I going to use this?"
Replies: 127
Views: 23380

Re: "When am I going to use this?"

Here are some consumer problems (and thus have wide applicability). [...] Some of those are really, really difficult though. And most people survive not really bothering with them. "Producer" problems (when you are actually doing something useful for the rest of the humans on earth) will ...
by the tree
Sun Apr 11, 2010 1:42 pm UTC
Forum: Mathematics
Topic: New value of pi?
Replies: 45
Views: 6816

Re: New value of pi?

The thing is, that he is right in some sense. I mean, if you approximate the circle by interior polygons, you get closer and closer to the value of pi, but always miss it by a small amount. This is perfectly true. However, he then makes a 'bit' of a mistake by saying that this is an error that's bo...
by the tree
Fri Apr 09, 2010 2:13 pm UTC
Forum: Mathematics
Topic: Calculus Derivatives Question
Replies: 5
Views: 795

Re: Calculus Derivatives Question

Maple agrees with you as well. Take this to your teacher but make sure you've worked through it intensely enough.
by the tree
Wed Apr 07, 2010 3:03 pm UTC
Forum: Mathematics
Topic: math "hobby"
Replies: 11
Views: 2180

Re: math "hobby"

Numeric methods are kind of massively important, just in general. They can exercise basic programming skills and involve some real applied maths. The idea is that you want a decimal approximation for some number to be as precise as possible, as quickly as possible. Say you have a function f and you ...
by the tree
Tue Apr 06, 2010 4:25 pm UTC
Forum: School
Topic: "When am I going to use this?"
Replies: 127
Views: 23380

Re: "When am I going to use this?"

Actually, the real reason why the word problems are contrived is not because they can't come up with real-life situation that uses it AND encountered by an average person. It's they can't come up with real-life situation that uses it AND encountered AND not absurdly hard. I do not think it is very ...
by the tree
Tue Apr 06, 2010 3:34 pm UTC
Forum: Mathematics
Topic: Interesting Thought
Replies: 9
Views: 1254

Re: Interesting Thought

a*x+b*y = c1 e*x+f*y = c2 What is the reasoning behind this? It's probably simple, but I can't see it :P Starting with this equation I can totally see how to isolate the variable and plug it back in etc, but how do we get this first set of equations from the original? If you have two equations, the...

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