Math Is Fun Forum
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#76 Re: Introductions » On completing another orbit » 2007-01-29 10:16:14
Very, very, very nicely written 
Welcome back, hope to see you around some more in the future
#77 Re: Help Me ! » Can u explain Function Notation » 2007-01-29 09:58:54
I've also experienced that my teachers seem to care very little about notation...
#78 Re: Help Me ! » Can u explain Function Notation » 2007-01-29 07:21:43
well, generally, we write a function of x, like
the proper notation would be
what do you mean by proper? Don't they mean the same thing?
#79 Re: This is Cool » pi » 2007-01-29 07:14:55
#80 Re: Maths Is Fun - Suggestions and Comments » Random Words » 2007-01-29 02:00:54
VERY remarkable of killing so suddenly down and noticed that thing; the passed; it was very deep, or a waistcoat-pocket, or a waistcoat-pocket, or considering in it, `and book down went down went down a jar from one of the thout her feet, for somebody, she looked across her sister it, never and no p
almost poetic
#81 Re: Help Me ! » only for mathsyperson » 2007-01-29 01:55:40
http://en.wikipedia.org/wiki/List_of_scientific_journals_in_mathematics
#82 Re: Help Me ! » Mortgages » 2007-01-29 01:53:55
Well.. It's kinda hard for me to explain in english, but if A[sub]0[/sub] is the amount of money you borrow, y is the size of the installment, r interrest rate pr. installment and n is the amount of installments, the following applies:
and from there I just isolated y since n, r and A[sub]0[/sub] was known.
I could post a proof for the A[sub]0[/sub] formula, but I don't have the time right know. Also, this isn't exactly my favorite topic
Maybe when I have some more time I will.
#83 Re: This is Cool » Multiplication by drawing and mathsisfun.com listed on yahoo! » 2007-01-29 01:27:07
I have been thinking of a mild re-design of the front page. I just don't have any ideas yet.
If you want some input from the users, you could make post in the suggestions forum. I guess you must have some things you "want it (not) to be", and if you wrote that down, people could make suggestions, post examples, etc.
#84 Re: This is Cool » 0.9999....(recurring) = 1? » 2007-01-29 01:23:53
So there we have it! Looks like The Cambridge Advanced Dictionary/Thesaurus has Defeated everyone on this Post!
The Equation below sums up everything in a Nice way!!
( 0.9r "Definition" ) <> 1 )
A.R.B
Why don't you try to submit some of your great ideas to a journal and have it peer reviewed?
#85 Re: Help Me ! » Mortgages » 2007-01-28 00:02:56
Where y is the annual installments, r being the interest rate (0.12), n being the amount of dates of payment and A[sub]0[/sub] being the size of the loan.
#86 Re: This is Cool » 0.9999....(recurring) = 1? » 2007-01-27 23:57:39
George, Y - As I told you in the other 0.(9)=1 thread, mathematics is nothing but a system logically derived from some axioms. Therefore, if something is true according to the axioms, it's true in mathematics. You could of course change some axioms, but that would change mathematics totally, and you'd be left with a whole new system. You're totally welcome to create your own system, based on the real world, but then you'd need to discuss it somewhere else than this forum - or atleast make it clear what you were talking about. The bottomline is - math does not depend on the 'real world', nomatter how neatly you can use math to solve problems in it.
#87 Re: This is Cool » My Great Theory » 2007-01-27 11:04:14
George,Y wrote:Ricky wrote:What I have recently found increasing interesting is that you can prove that numbers exist. Once one accepts ZF set theory, and then defines the natural numbers, you can prove that the natural numbers do in fact exist. Then once you define addition, you can prove that addition exists. You can do exactly the same with multiplication and exponents. And then the same with the integers, rationals, and reals.
That could be circular logic, Ricky. For example, the premise is the set exists, after some certain deduction the number exists. The logic in the middle may be sound, but you should accept the premise first.
Not at all. That's exactly what an axiom is, George. Something taken to be true without proof.
If you have no axioms, then you can't do anything.
And this is why I like mathematics so much. It's a system, nothing more, nothing less. A system, albeit very advanced, based on some basic ideas - which we prefer to call axioms. If you met a person with no knowledge of mathematics at all, you could explain even the most complex things - by traceing them all the way back to the axioms of mathematics.
#88 Re: This is Cool » 0.9999....(recurring) = 1? » 2007-01-26 21:36:52
Well, I think Georgy, Y is back to disagree I understood the post as if he's saying one number can't be equal to another, and if it can - why can't 1 also be 2 and so on? I just think he missed the point that they aren't different numbers (1 and 0.(9)). All this comes down to the view he has on infinity.
#89 Re: This is Cool » 7ths are kl! » 2007-01-26 21:33:52
I can tell 0 is present if you see 7/7 as 1.0
I don't know, I study it in primary school just for arithmetric convenience. We pupils also memorized 11²=121, 12²=144, 13²=169, 14²=196, 15²=225, 16²=256, 17²=289, 18²=... I forgot.
These are actually quite handy to remember, and not too hard to learn. First of all becuase they're not too hard to calculate, 18*18=10*18+8*18=180+80+64. It also helps, though, that 18*18 and 8*8 will have the same last digit. If you only have to remember so many squares, the last digit can help you remember the full number. That's how I remember them atleast.
#90 Re: This is Cool » My Great Theory » 2007-01-26 21:28:36
pi man wrote:Anthony.R.Brown wrote:Another important point is!
Is it possible to fill a Glass with water 100% I think not! because water droplets are larger than air pockets,that Glass contains! so the answer must always be Only 99.99999....% possible!
But everyone knows 99.99999...% = 100%
Not me.
So far as I know, there is not a single material that is 99.999...% pure:
24K gold is 99.999999% pure,
Diamond can be even purer, but not with infinite 9's.And that is how my chemistry teacher told me:" strictly there is no material pure up to now".
You're mixing math and physics/chemestry in a way which isn't defendable - please don't. Mathematics is, deliberately, a system which isn't based on the 'world'. The ancient Greeks invented the system with axioms, proofs, etc, because of the view on the world they had - greatly influenced by thinkers like Plato. Physics and chemistry are greatly dependable on math, but they're based on observations of the 'world'. Since math is not based on how the 'world' works, you can't prove something wrong in mathematics by using science. 
#91 Re: This is Cool » 7ths are kl! » 2007-01-26 09:29:27
Oh, okay.. I get what you mean now
#92 Re: This is Cool » 7ths are kl! » 2007-01-26 09:06:52
I'm not sure I see what you mean?
#93 Re: This is Cool » My Great Theory » 2007-01-26 09:02:20
To Patrick
Quote:
"Neither, it has 50% water(with it's impurities) and 50% air(with it's impurities).. No need to be negative or positive about what a glass contains, it just does "A.R.B
But I'm sure you are missing the % that is taken up by the internal lining of the Glass!
What are you talking about? Filling a glass, means replacing air, in the space with the glass as it's boundaries, with water. So of course you could.
#94 Re: Help Me ! » find the fault in 1 = 3 » 2007-01-24 10:35:31
Neat, thanks for finding the link
#95 Re: Maths Is Fun - Suggestions and Comments » forum for artists? » 2007-01-24 10:10:40
I have to agree with Rod. DDCI is for anything basicly, music aswell.
There are lots of music forums out there, if you really need a dedicated section for music in general or your specific instrument(s).
#96 Re: Dark Discussions at Cafe Infinity » online in school » 2007-01-24 10:08:38
Maybe, she was actually the one who tricked you 
#97 Re: Help Me ! » find the fault in 1 = 3 » 2007-01-24 09:36:35
Thanks in advance
#98 Re: Introductions » Another newbie! » 2007-01-24 09:28:59
Hey everybody!
Neela here. I've posted here a few times as a guest (in the 'help me' section lol) and thought it was about time I joined the site.
Umm, I'm not really a very interesting person, but here's something about me anyway... Unlike most of you guys in here, I'm not very into math. Math is just not my strong side, lol. But hey, I'm trying.
I'm 19, currently studying psychology at the University of Copenhagen (I'm from Denmark) and taking maths (don't ask me why) and arabic as side courses. My hobbies include singing classsical and carnatic, soccer (I kick butt, baby!) and struggling with the sitaar (hopeless, I tell you).
Anyway, I joined this site in hope of starting to like math in the near future.
Whoa. If any of you made it through my essay without falling asleep, introduce yourself
How could I miss this!? Well, I kinda gave up on the introduction section a long time ago 
Welcome anyway.
Patrick
P.s: Hvilket år er du på? (edit: så lige din alder, så jeg går ud fra du er førsteårsstuderende?)
#99 Re: Help Me ! » find the fault in 1 = 3 » 2007-01-24 09:19:17
luca - could you maybe post that? I'd like to see it
#100 Re: Guestbook » I love math » 2007-01-24 09:15:31
Perhaps they should stamp our world with a big fat copyright stamp. Basically everything is taken now.
Yeah, just like there was nothing more to invent in 18-something, so someone suggested the patent-offices to be closed.