Search found 732 matches

by the tree
Sun Apr 20, 2014 9:00 am UTC
Forum: Mathematics
Topic: Estimators for attendance.
Replies: 3
Views: 2078

Re: Estimators for attendance.

Thank you both. If you're interested then here's some further context: I've recently taken over someone else's job and don't have too many of their old records. I don't know how heavily previous events were promoted (these are, by the way, non compulsory training events for long term volunteers) and...
by the tree
Fri Apr 18, 2014 2:26 pm UTC
Forum: Mathematics
Topic: Estimators for attendance.
Replies: 3
Views: 2078

Estimators for attendance.

So I'm organising an event and a lot of people aren't RSVPing very promptly but I do need to buy some refreshments etc so I am trying to make a guess for attendance based on who actually has gotten back to me. It's been a while since I did any maths and probability was never my forté but I got curio...
by the tree
Sun Jun 03, 2012 11:50 am UTC
Forum: Mathematics
Topic: Math: Fleeting Thoughts
Replies: 382
Views: 114934

Re: Math: Fleeting Thoughts

It's there a word to describe the smallest degree of polynomial to have a given number as it's root? So if it was f(x) then when x is a rational number, f(x) would be 1. f(sqrt(2))=2, f(pi)=infinity. I dunno if that would have any interesting properties or whatever but it feels like it should have a...
by the tree
Tue Jan 10, 2012 3:16 pm UTC
Forum: Fit Club
Topic: How to decide on targets and questions to ask a trainer.
Replies: 2
Views: 2171

How to decide on targets and questions to ask a trainer.

I joined a gym on Saturday (new years cliche, I know), and membership came with one free personal trainer session. I wasn't going to use that free session for a while but a personal trainer approached me yesterday while I was staring at a resistance machine looking confused and before I knew it I ha...
by the tree
Wed Nov 30, 2011 2:55 pm UTC
Forum: Mathematics
Topic: Simultaneous equations
Replies: 1
Views: 636

Re: Simultaneous equations

Yeah they're called simultaneous equations. And yes that's gotten you a correct answer. (although it took me a minute to realise that the 1 and 2 and the end of each wasn't part of the equations, typically you'd put those in brackets or something to avoid ambiguity). Another way you could have done ...
by the tree
Fri Jul 08, 2011 9:20 am UTC
Forum: Mathematics
Topic: How difficult is Discrete Mathematics?
Replies: 23
Views: 13239

Re: How difficult is Discrete Mathematics?

Most of that looks kind of well, essential for any course really: learning how to do proofs in discrete is a pretty good stepping stone to being able to do proofs in real analysis. You need set theory basically all the time (there is not actually such thing as set theory, there's just a lot of termi...
by the tree
Mon Mar 14, 2011 10:27 pm UTC
Forum: Mathematics
Topic: [0,1] ~ [0,1) (Cardinality)
Replies: 5
Views: 3581

Re: [0,1] ~ [0,1) (Cardinality)

I asked my teacher and he told me that I should find an injection from each to the other, as that guarantees they are equipotent. Where can I find a proof of that theorem? It's called the Cantor–Bernstein–Schroeder Theorem , the Wikipedia article is okay. Can I still find a bijection which is not h...
by the tree
Thu Mar 10, 2011 11:43 am UTC
Forum: Mathematics
Topic: Four nines puzzle
Replies: 13
Views: 2636

Re: Four nines puzzle

OverBored wrote:
the tree wrote:4 = 2!
Urm... it was one in the morning? Does that count as an excuse?
by the tree
Thu Mar 10, 2011 12:48 am UTC
Forum: Mathematics
Topic: Four nines puzzle
Replies: 13
Views: 2636

Re: Four nines puzzle

Okay. 1-12 Assume 1 is to be read as .9(bar) 1 = 99/99 2 = 9/9 + 9/9 3 = (9 + 9 + 9)/9 4 = 2! 5 = 9.9(bar)/(1 + 1)) 6 = 3! 7 = (9 - 1 -1)/1 8 = (9 - 1) * 1 * 1 9 = 9 * 1 * 1 * 1 10 = 9.9(bar)*1*1 11 = (9.9(bar)+1)*1 12 = 9.9...
by the tree
Mon Feb 28, 2011 1:15 am UTC
Forum: Mathematics
Topic: |i|
Replies: 34
Views: 4569

Re: |i|

You can think of absolute value in the real numbers as the distance from 0. It's the same in the complex plane. I always like to go for "how 'big' a number is", which if you're thinking of complex numbers as vectors then that works quite neatly. Except that the imaginary numbers are not l...
by the tree
Mon Feb 21, 2011 5:38 pm UTC
Forum: Mathematics
Topic: |i|
Replies: 34
Views: 4569

Re: |i|

Meem1029 wrote: You can think of absolute value in the real numbers as the distance from 0. It's the same in the complex plane.
I always like to go for "how 'big' a number is", which if you're thinking of complex numbers as vectors then that works quite neatly.
by the tree
Wed Feb 16, 2011 1:44 pm UTC
Forum: Mathematics
Topic: Is this a meaningless math question?
Replies: 24
Views: 2445

Re: Is this a meaningless math question?

Zero. Definitely zero.
by the tree
Wed Feb 16, 2011 11:52 am UTC
Forum: Mathematics
Topic: Is this a meaningless math question?
Replies: 24
Views: 2445

Re: Is this a meaningless math question?

EDIT: ok I think the probability thing is what is breaking everyones brainmeats.. :) would a more clearly defined question be "What percentage of natural numbers are prime?". The reason I was wondering if it were a meaningless question is because there are infinite natural numbers and als...
by the tree
Fri Feb 11, 2011 3:07 am UTC
Forum: Mathematics
Topic: The Tau Manifesto
Replies: 165
Views: 41449

Re: The Tau Manifesto

doogly wrote: So clearly 45 degrees is "really" a 16th of something, right?
Everything is a 16th of something.
by the tree
Wed Feb 09, 2011 2:09 pm UTC
Forum: Mathematics
Topic: The Tau Manifesto
Replies: 165
Views: 41449

Re: The Tau Manifesto

While we're at it, [imath]8\pi = \frac{\pi}{0}=0.999\dots = i = -i = \aleph_\frac{1}{2}[/imath] as well - it couldn't hurt.
by the tree
Fri Feb 04, 2011 4:30 pm UTC
Forum: Mathematics
Topic: How should I get into 'higher' mathematics?
Replies: 11
Views: 1628

Re: How should I get into 'higher' mathematics?

Presumably you're doing some sort of precalculus or algebra or whatever you're calling it at the moment and you're only just being properly introduced to polynomials. As it happens, polynomials are kind of really really important when it comes to nearly the rest of mathematics. Learn to factor them,...
by the tree
Tue Jan 25, 2011 1:59 pm UTC
Forum: Mathematics
Topic: ridiculous naming trend in definitions
Replies: 18
Views: 2427

Re: ridiculous naming trend in definitions

It seems that there is no end to the amount of different "[adjective] numbers". Integers can be happy, amicable, friendly, sexy, perfect...
by the tree
Mon Jan 17, 2011 12:24 pm UTC
Forum: Mathematics
Topic: functions that give cool designs
Replies: 56
Views: 16764

Re: functions that gives cool designs.

Case in point, if OP had just asked his classmates what some cool linear equations were, he'd never have discovered that implicit or parametric equations are more interesting. Okay then... Afif_D : ⋅ If you really want to carry on with explicit functions then spend some time working on th...
by the tree
Sat Jan 15, 2011 1:43 pm UTC
Forum: Mathematics
Topic: functions that give cool designs
Replies: 56
Views: 16764

Re: functions that give cool designs

I'm already fairly sure of what it'll turn out to look like, based upon Qaanol's post.
by the tree
Wed Jan 12, 2011 4:26 pm UTC
Forum: Mathematics
Topic: functions that give cool designs
Replies: 56
Views: 16764

Re: functions that gives cool designs.

Try urm... y^2 = \sin(2 \pi x^n) for any natural n, that's a fairly pleasant set of blobby things, I'm fairly sure that the area enclosed by the blobby things is always infinite but don't hold me to that. I thought you all genius guys would pt some cool functions in here.... but i was wrong....
by the tree
Fri Dec 31, 2010 3:29 pm UTC
Forum: Mathematics
Topic: Questions about sets
Replies: 18
Views: 2701

Re: Questions about sets

\aleph_{0} is defined as the smallest infinite cardinal, \aleph_{1} is defined as the second-smallest, \aleph_{2} is the third smallest, etc. Considering cardinalities is something we really don't know much about (or so I'm told) - what happens if it turns out that between any two cardinalities, th...
by the tree
Fri Dec 17, 2010 2:48 am UTC
Forum: Mathematics
Topic: Useless Math
Replies: 60
Views: 8550

Re: Useless Math

ImTestingSleeping wrote:I would think that mathematics in higher dimensions would be rather useless. Would I be wrong with that statement?
Pretty wrong, yeah. For instance, I'm doing coding theory at the moment, which is largely in an arbitrary amount of dimensions.
by the tree
Sat Dec 11, 2010 10:37 am UTC
Forum: News & Articles
Topic: Britain increases tuition, met with violent protests
Replies: 148
Views: 10517

Re: Britain increases tuition, met with violent protests

For the record - the protests were not just about the fees increase, but the funds decrease that comes with it. Not to mention the EMA 're-structuring', which is of course going to get a lot more people a lot more angry as the vote on that comes up. It's for this reason that I'm writing this from wi...
by the tree
Mon Dec 06, 2010 3:53 pm UTC
Forum: Mathematics
Topic: Probability of finding two snowflakes alike? Need help!
Replies: 7
Views: 3228

Re: Probability of finding two snowflakes alike? Need help!

Really the question is how many ways can [however many] water molecules be arranged in a snowflake like pattern, which requires knowing more about water molecules than it does about probability.
by the tree
Mon Dec 06, 2010 3:19 pm UTC
Forum: Mathematics
Topic: Polar Coordinates Intuition
Replies: 7
Views: 1382

Re: Polar Coordinates Intuition

cba wrote:That annoyed me becasue i quite like graphing in a normal x-y co-ordinate system, where doing a table of values really doesnt help you at all...
If you're plotting an explicit function, and I say plotting rather than sketching, a table of values is really all you're aiming for.
by the tree
Sun Dec 05, 2010 10:03 pm UTC
Forum: Mathematics
Topic: Polar Coordinates Intuition
Replies: 7
Views: 1382

Re: Polar Coordinates Intuition

So how do I develop the intuition for visualizing the graph of a polar function in my mind? Are there any tricks to it or any general forms to memorize? I can't really think of any. I just think, what is r when theta is 0 and when you deviate from zero the left or the right - how does r change. Sim...
by the tree
Wed Dec 01, 2010 2:28 pm UTC
Forum: General
Topic: This.
Replies: 31
Views: 3245

Re: This.

It's really not specific to these fora, I've seen it generally across the Internet. Lots of forum software has a feature that every post must contain at least some characters, and those within quote tags don't count so things like "this", "QFT" or "^^^^" below a quote a...
by the tree
Wed Dec 01, 2010 11:43 am UTC
Forum: Science
Topic: Rate of change for a charging battery.
Replies: 2
Views: 442

Rate of change for a charging battery.

(maybe this should have been put in Fleeting Thoughts - but the Science one of that is old and empty so I figured it wouldn't hurt to create a new thread) I noticed that when charging my phone, it seems to slow down as it gets closer to 100%, that is that it gets from 0 to 50% in a few minutes but t...
by the tree
Thu Nov 25, 2010 5:15 pm UTC
Forum: Mathematics
Topic: Bessel functions.
Replies: 1
Views: 488

Bessel functions.

(this is for uni, so I guess it counts as homework help) I've only just come across these functions and suddenly I need to know how to work them, so please bear with me and my possibly kind of dumb questions. From what I've seen (reading from Advanced Engineering Mathematics, Kreyszig) Bessel's equa...
by the tree
Thu Nov 25, 2010 1:22 pm UTC
Forum: Mathematics
Topic: How hard is college level mathematics?
Replies: 36
Views: 7303

Re: How hard is college level mathematics?

I still get confused when Americans say college and they mean what you do after being 18. I'd say math/everything gets harder as it gets more specialised. Rather than just learning 'math' you will have many completely seperate classes , there's not much relation between an introduction to real analy...
by the tree
Wed Nov 24, 2010 5:01 pm UTC
Forum: Mathematics
Topic: LaTeX and other markup!
Replies: 73
Views: 33973

Re: LaTeX and other markup!

Thanks, eqn array managed to do it. (I had to spend a good bit of time staring at it to realise how to make that not ennumerate every line).
by the tree
Wed Nov 24, 2010 2:47 pm UTC
Forum: Religious Wars
Topic: Math or Science
Replies: 65
Views: 53062

Re: Math or Science

Since CS and programming is 99%+ mathematics, I vote that. Not only that. I think it's definitely worth noting that pure math is a thing which is why I outright reject the assertion that math is part of physics. I think this is beyond comparing apples and oranges, I think that trying to find a winn...
by the tree
Wed Nov 24, 2010 2:37 pm UTC
Forum: Mathematics
Topic: LaTeX and other markup!
Replies: 73
Views: 33973

Re: LaTeX and other markup!

Not sure if this the right thread to ask general LaTeX question but if anyone could help me with this, it'd be cool. In a document I'm writing I have: Some writing $ $ god awful equation that is a million billion characters long and makes you want to cry $ $ some more writing And within the double-d...
by the tree
Sun Nov 14, 2010 2:17 pm UTC
Forum: News & Articles
Topic: Some happier gay teen news
Replies: 8
Views: 2343

Re: Some happier gay teen news

How much of a problem is it that the Australian Christian Lobby can be dicks? Are they a powerful organisation?
by the tree
Fri Nov 12, 2010 1:50 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 0818: "Illness"
Replies: 116
Views: 31973

Re: 0818: "Illness"

I am actually genuinely impressed that this, to the best of my knowledge, is the first update to be missed. It's like he's not even trying to be funny anymore. I think that was a little innapropriate, really. Obviously, no-one tries to be funny all the time, apart from douchebags who are a never fun...
by the tree
Fri Nov 12, 2010 1:38 pm UTC
Forum: Science
Topic: pseudoscience and quantum computers
Replies: 23
Views: 2691

Re: pseudoscience and quantum computers

Reckitt Benickiser, who make Finish cleaning products, has "Quantum", trademarked - so they can excuse it as just a brand. Like how Macintosh Computers, Wicked Lasers and Best Beer actually have nothing to do with coats [citation needed] , aren't evil and are meerly above par respectively....
by the tree
Thu Nov 11, 2010 10:12 pm UTC
Forum: News & Articles
Topic: Porpoises rescue Dick Van Dyke
Replies: 10
Views: 3187

Porpoises rescue Dick Van Dyke

The Guardian wrote:...the veteran star of Chitty Chitty Bang Bang and Mary Poppins had to rely on the help of a pod of porpoises after apparently dozing off aboard his surfboard...
...the porpoises were unavailable for comment...

I have nothing to add, I just think you all need to know that this happened.
by the tree
Thu Nov 11, 2010 8:20 pm UTC
Forum: Mathematics
Topic: HW Help: prove an element is primitive.
Replies: 16
Views: 940

Re: HW Help: prove an element is primitive.

THANKYOU
:D :D :D :D :D :D
by the tree
Thu Nov 11, 2010 8:09 pm UTC
Forum: Mathematics
Topic: HW Help: prove an element is primitive.
Replies: 16
Views: 940

Re: HW Help: prove an element is primitive.

Make that five. Apparently all this mathsing it ruining my ability to count.

So okay, a penny has dropped, but possibly in the entirely wrong place - is it something to do with the elements can only have orders that are divisors of p-1? If so, does that urm... have a name I can look up or something?

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