
Please post any and all homework or other textbookstyle problems in one of the Homework & Coursework Questions...

Feb2313 09:23 AM
micromass

1 
38,995 
I have noticed that the term "map" is used more often than "function" when a map/function is defined using the...

Sep110 06:11 PM
adriank

3 
1,025 
http://i.imgur.com/5fdsQ.png
I am unsure of how they were able to change 8.7 to 8 and make 2.3 to 2. Whats the...

Sep110 01:11 AM
mohabitar

3 
1,000 
Can the hyperreal numbers be described as a vector space over the reals with a basis (0,...,e2,e1,e0,e1,e2...),...

Sep110 12:31 AM
Rasalhague

5 
941 
i have made a new cipher and was hoping you guys could comment on it, tell me how i could improve it, and whats wrong...

Aug3110 10:25 AM
Mark44

5 
1,368 
Hi,
Suppose I have a space X with coordinates (x,y,z) and a space Y with coordinates (x,y,z,t), so that...

Aug3110 01:20 AM
FreHam

4 
991 
Hi, I'm learning vector calc on my own and my book wasn't clear on some basic definitions.
1. My text mentions that...

Aug3010 02:24 PM
Red_CCF

7 
1,511 
if the diameter of a circle is a finite value, and the circumference of a circle is a finite value, how can the ratio...

Aug3010 12:12 PM
CRGreathouse

21 
2,945 
Hi,
whats the formula for work and Time ?
is it this ?
N1 * D1 * W1 =N2*D2*W2
where ,

Aug3010 09:03 AM
chandra rocks

9 
52,173 
And if so, could I take the ith root of i?

Aug2910 01:15 PM
Petr Mugver

1 
1,882 
Let f(x) be the following function:
f(x)=\infty,if x<0 or x>a;f(x)=0,if 0<x<a.
What’s the derivative of f(x) at...

Aug2910 09:00 AM
HallsofIvy

4 
1,185 
I've been kicking myself trying to think of a few real world applications of cubic equations (and x^4 quintive?). Can...

Aug2910 08:47 AM
bpet

12 
44,616 
Example: Inflation over time
Supposed that I want calculate the final percent change in a 10 year period.
(year ,...

Aug2810 11:39 PM
uart

3 
5,761 
Why does e^i = 1 ?

Aug2810 01:11 PM
nonequilibrium

10 
5,981 
Hi
Just a simple Mod question.
Is (ka)mod kb = k(a mod b)?
Thanks

Aug2810 08:57 AM
Apteronotus

12 
1,727 
http://dl.dropbox.com/u/471735/Recurrence.png

Aug2810 04:44 AM
seeker101

1 
758 
A friend of mine gave me this problem to solve because he couldn't and I've been stuck in it for some time and also...

Aug2810 12:22 AM
Office_Shredder

3 
1,058 
I'm having trouble grasping this concept. This is the part in question:
Why is the point x uniquely determined...

Aug2710 11:45 PM
CRGreathouse

8 
2,913 
I know that
\sum_{n=\infty}^\infty{1} = \infty
But I don't understand why.
It...

Aug2710 11:41 PM
CRGreathouse

4 
1,200 
On the TI89 calculator SortA and SortD return outoforder responses.
How could I be doing anything wrong, really?
I...

Aug2710 09:27 PM
boozee

0 
1,013 
Hello,
I was looking at some math problems and one kind caught my attention. The idea was to prove that lets say...

Aug2710 11:00 AM
Office_Shredder

3 
746 
Hello Math friends,
I need some help in hyperplanes.
Basically, I need to calculate a random hyperplane that...

Aug2710 03:06 AM
Petr Mugver

13 
1,976 
I want to understand intuitively why it seems to be that when evaluating an integral at infinite, it only seems to...

Aug2710 02:20 AM
robert Ihnot

6 
2,122 
Hello, and thank you for any assistance offered.
I believe the attached nested radical to converge to a value, but...

Aug2710 02:12 AM
JJacquelin

1 
1,126 
I always wondered how you can differentiate a^x from first principles with the limit as dx approaches zero but I never...

Aug2610 04:07 PM
Philip Wood

11 
6,081 
Hi guys,
As somebody who likes to learn and understand everyday problems I've really hit a wall...
I learnt...

Aug2610 05:03 AM
Crabman

0 
2,884 
Hi!
I see there are three 3D coordinate systems based on either 3 number (cartesian), 2 numbers and 1 angle...

Aug2610 01:20 AM
Trave11er

3 
900 
I know I probably learned this 10 years ago, but I really have no idea how to simplify something like this:
(A*B +...

Aug2510 11:08 PM
robert Ihnot

6 
1,155 
Why is average relative velocity equal to the square root of 2 times the magnitude of the x direction velocity?
I'm...

Aug2510 03:34 PM
Oojee

1 
2,233 
Any suggestions on how to approach solving:
\Psi(m,n) \leq \Psi\left(\left...

Aug2510 02:38 PM
JSuarez

1 
918 
The Example is ;
Solve the recurrence relation a n1 + a n3 = 0 where n ≥ 3 and a 1 = 1 a 2 = 1 a 3 = 2
a n =...

Aug2410 03:33 PM
jasonRF

1 
2,171 
I am trying to figure out a way to prove this without using much set theory (i know that the rationals are countable...

Aug2410 01:27 PM
LCKurtz

1 
950 
Hi can anyone help me plz or give me a strong hint?
I have to prove this:
If f(x) is a function from natural to...

Aug2410 11:50 AM
Petek

26 
3,580 
Not a homework question, no worries. :) It's actually a work question.
We have a slope top foundation that we...

Aug2410 08:39 AM
nicoga3000

0 
591 
Suppose we have this absolute value question  x3  = 3 – x
If we solve this question we break it as
X  3 = 3 – x...

Aug2410 08:37 AM
statdad

1 
1,076 
Hello all
Does Godel's incompleteness theorem still hold true for fuzzy sets?
My feeling is that it doesn't...

Aug2410 02:34 AM
Hurkyl

1 
1,079 
I solved this absolute value equation and I am confuse about the answer given in the book for this question, the...

Aug2310 06:43 PM
aq1q

1 
1,730 
Greetings PF,
I am would like to play with using an automated theorem prover to reason about categories. I would...

Aug2310 06:26 PM
icantadd

0 
572 
Guys does anyone know of a technique to find the exponential of a tridiagonal symmetric matrix...
Thanks in...

Aug2310 05:14 PM
andresordonez

1 
1,765 
Someone try to solve this, and don't cheat and use a TI89 or similar CAS, a scientific calculator and a pen and paper....

Aug2310 03:55 PM
i2c

8 
1,581 
I've got what might be a couple of very basic questions on the fundamental representations of locally isomorphic...

Aug2310 02:04 PM
metroplex021

0 
777 