Search found 59 matches

by Ddanndt
Sun Jan 10, 2010 2:52 pm UTC
Forum: Science
Topic: Brain= ???? Bytes
Replies: 74
Views: 8002

Brain= ???? Bytes

Hi everybody. I was revising for my exams and was just wondering how much information is contained in my poor little brain or if it was possible to measure someone's brain capacity like a hard-drive. Thx for your feedback...
by Ddanndt
Sat Jan 02, 2010 2:48 pm UTC
Forum: Mathematics
Topic: Infinite number of asymptotes
Replies: 35
Views: 4188

Re: Infinite number of asymptotes

It's probably not necessary to spoiler it at this point, since if it was homework it was from a couple weeks ago now. But yeah, that's the first function that came to my mind as well. (And after that, it occurred to me that the whole of the real line is also a closed domain, so technically tan itse...
by Ddanndt
Mon Dec 21, 2009 6:32 am UTC
Forum: Mathematics
Topic: Infinite number of asymptotes
Replies: 35
Views: 4188

Re: Infinite number of asymptotes

Well I was thinking about 1/⌊x⌋ but I think it's only undefined in the interval [0, 1[ .










I never post just for the sake of posting and I never try to increase my number of posts by any means :lol: ..
by Ddanndt
Sun Dec 20, 2009 8:40 pm UTC
Forum: Mathematics
Topic: Infinite number of asymptotes
Replies: 35
Views: 4188

Infinite number of asymptotes

Hi everybody. I was asking myself that if it is possible for a function defined in a closed domain or interval to have an infinite number of asymptotes. Thanks for your feedback.
by Ddanndt
Sun Dec 20, 2009 5:32 pm UTC
Forum: Mathematics
Topic: Question about Logarithms & Pi
Replies: 9
Views: 1693

Re: Question about Logarithms & Pi

Dason wrote:
NathanielJ wrote:Related question: why does [imath]e^\pi - \pi = 20[/imath]?

Oh no! My calculator tells me it's 19.9991... It must be broken. I guess the programmers messed up somewhere. Sad sad day...


It's approx pi but not pi (3.141633303...
by Ddanndt
Fri Dec 18, 2009 10:43 am UTC
Forum: Mathematics
Topic: True or False
Replies: 13
Views: 1662

Re: True or False

Getting back on topic, it might help to translate it to plainer English: "If a function asymptotically approaches 0 as x goes to infinity, does that imply that the slope of the function also approaches 0 as x goes to infinity?" The answer to that question should be intuitively clear. As s...
by Ddanndt
Thu Dec 17, 2009 4:45 pm UTC
Forum: Mathematics
Topic: True or False
Replies: 13
Views: 1662

Re: True or False

Token wrote:The function [imath]\frac{1}{x}\sin(x^2)[/imath] should give some insight...


I got lim of dy/dx as x->infinity undefined (??)... (2cos (x^2))...
by Ddanndt
Thu Dec 17, 2009 4:01 pm UTC
Forum: Mathematics
Topic: True or False
Replies: 13
Views: 1662

Re: True or False

Nah. I saw this in a textbook and although I know the answer I'm having trouble proving it...
by Ddanndt
Thu Dec 17, 2009 3:40 pm UTC
Forum: Mathematics
Topic: True or False
Replies: 13
Views: 1662

True or False

Hi everybody. " If the graph of a function f(x) has the positive x-axis as asymptote , does it imply that

[math]\lim_{x\to\infty} \text{f}{\prime} \text{(x)} = 0[/math] ?"
by Ddanndt
Tue Dec 15, 2009 4:37 pm UTC
Forum: Science
Topic: "Alchemy" and radioactive decay
Replies: 17
Views: 4001

Re: "Alchemy" and radioactive decay

In my knowledge many banks have monetary reserves in the form of gold bars ...
by Ddanndt
Tue Dec 15, 2009 4:35 pm UTC
Forum: Mathematics
Topic: Integration of e^( x^2)
Replies: 24
Views: 4132

Re: Integration of e^( x^2)

In fact I thought there maybe was a function I didn't know about yet because when integrating [math]e^{x^2}[/math] using substitution I got integration of other functions like [math]1\over{\sqrt{\ln x}}[/math] and [math]e^x \over{\sqrt x}[/math] which also cannot be expressed using usual functions...
by Ddanndt
Tue Dec 15, 2009 4:12 pm UTC
Forum: Science
Topic: "Alchemy" and radioactive decay
Replies: 17
Views: 4001

Re: "Alchemy" and radioactive decay

Even if an economically feasible way was found I don't think we would know anything about it. Imagine what would happen if every country started 'transmuting' gold. Another world-wide economic crisis :shock: !!!
by Ddanndt
Tue Dec 15, 2009 3:52 pm UTC
Forum: Mathematics
Topic: Snail on a string
Replies: 4
Views: 1141

Re: Snail on a string

(velocity of a point on the string) v ={x^2 \over (1+t)^2} (velocity of the snail on the string) v ={x^2 \over (1+t)^2}+ 0.01 {x \prime } ={x^2 \over (1+t)^2}+ 0.01 i) {x\prime }-{x^2 \over (1+t)^2}=0 x=(1+t) x 0 = 1 + t ii)x=x 0 z {z\...
by Ddanndt
Sun Dec 13, 2009 7:00 pm UTC
Forum: Mathematics
Topic: Snail on a string
Replies: 4
Views: 1141

Re: Snail on a string

Yeah in fact the answer is e 100 - 1 seconds. At the start I considered the speed at any point on the string , v string = x / L , L being the total length of the string , x being position on the string ... and from there I worked out the prob. But then I asked myself if it would be correct to consid...
by Ddanndt
Sun Dec 13, 2009 5:16 pm UTC
Forum: Mathematics
Topic: Snail on a string
Replies: 4
Views: 1141

Snail on a string

Ok a math prob:

I have a 1m elastic band , with a fixed end. I place a snail which moves at a speed of 1cm/s at the fixed end and I start pulling the other end at a speed of 1m/s. After how much time will the snail reach the other end of the elastic band? (P.s the elastic band won't break).
by Ddanndt
Sat Dec 12, 2009 9:00 pm UTC
Forum: Mathematics
Topic: Integration of e^( x^2)
Replies: 24
Views: 4132

Integration of e^( x^2)

Hi everybody. I wanted to know if it was possible to integrate e^ (x^2) to get an exact function i. e not using the Taylor series...
by Ddanndt
Sat Dec 12, 2009 8:42 pm UTC
Forum: Mathematics
Topic: Simple proof for a removable discontinuity
Replies: 9
Views: 2247

Re: Simple proof for a removable discontinuity

z4lis wrote:
Now if u don't understand the question then I really question your math knowledge ...


Well, I certainly wouldn't want to assist anyone who doesn't have faith in my ability to help.





Sorry it was @ sceptical scientist
by Ddanndt
Sat Dec 12, 2009 8:25 pm UTC
Forum: Mathematics
Topic: Simple proof for a removable discontinuity
Replies: 9
Views: 2247

Re: Simple proof for a removable discontinuity

The graph of y =(e^x) / [1 + ( e ^ ( 1 / x ))] isn't continuous at x= 0 meaning it is undefined for x=0. My question was if it was possi ble to find a value of y at x= 0 so that the graph becomes continuous. Or another way of formulating the question would be : is the limit of y for x tending to 0+ ...
by Ddanndt
Sun Oct 04, 2009 2:36 pm UTC
Forum: Mathematics
Topic: Simple proof for a removable discontinuity
Replies: 9
Views: 2247

Simple proof for a removable discontinuity

Hi have some homework for u guys...

Question is : Is it possible to remove discontinuity at x=0 for exp(x) / 1+ exp(1/x) and show proof ( preferably by algebra)... Thx

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