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

Feb2313 09:23 AM
micromass

1 
33,263 
I know that
\sum_{n=\infty}^\infty{1} = \infty
But I don't understand why.
It...

Aug2710 11:41 PM
CRGreathouse

4 
1,151 
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 
964 
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 
709 
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 
1,877 
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 
2,013 
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 
1,067 
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 
5,821 
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 
2,759 
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 
851 
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 
1,085 
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 
2,126 
Any suggestions on how to approach solving:
\Psi(m,n) \leq \Psi\left(\left...

Aug2510 02:38 PM
JSuarez

1 
832 
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 
2,069 
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 
913 
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 
3,415 
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 
550 
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 
1,031 
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 
1,004 
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 
1,638 
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 
538 
Guys does anyone know of a technique to find the exponential of a tridiagonal symmetric matrix...
Thanks in...

Aug2310 05:14 PM
andresordonez

1 
1,664 
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 
1,487 
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 
756 
I noticed that, for resistors in a parallel circuit, where R1 is < R2, the minimum value is (R1)/2, and the maximum...

Aug2310 09:27 AM
Office_Shredder

1 
1,769 
Prove that \prod_{j=1}^{\infty}\left(1\frac{1}{f(j)}\right)>0 for all f:\mathbb{N}^{+}\to\mathbb{R}^{+} which satisfy...

Aug2210 11:41 PM
aq1q

11 
1,422 
My lecturer used a symbol in class that represents an element being removed from a set to form a new set. Does anyone...

Aug2210 10:17 PM
adriank

6 
1,169 
or pay a prepayment penalty? Il

Aug2210 01:28 PM
CRGreathouse

4 
654 
What is Fermat's last theorem?
and How is that related to primes numbers of form 3x+1 and 3x+2

Aug2110 07:12 AM
g_edgar

2 
861 
A negative number has the minus sign as its own intrinsic operator. Has anyone thought of using the divide symbol in a...

Aug2010 11:56 PM
Hurkyl

6 
1,291 
Hi
Two vectors A and B are equal if they have the same magnitude and the same direction . this property allows...

Aug2010 05:19 PM
rsoy

2 
955 
What do you think about Golbach's Conjecture?
Statistical analysis has shown that it is highly unlikely to be False,...

Aug2010 05:06 PM
Fraqtive42

0 
1,683 
Suppose I have any modular function, for example:
f(x) = 2x + 4 + 3
I can rewrite the function in the...

Aug2010 10:48 AM
Office_Shredder

3 
710 
Friend sent me this and I can't figure it out for sure. I think the answer is the Brits. Tell me what you think it is....

Aug1910 10:32 PM
AD7863

6 
1,574 
I'm trying to design a reading course for lattice based crypto, and while the book by goldwasser and micciancio is...

Aug1910 02:21 PM
Dragonfall

0 
1,140 
What is "in the distributional sense"? How to comprehend it meanings?
What is the difference between "in the...

Aug1910 01:11 PM
Hurkyl

12 
2,315 
We have a circle of certain radius.How many circles of smaller radius(we are provided with the ratio of radius) can be...

Aug1910 10:43 AM
Gerenuk

8 
13,250 
I've just found that, for all a>0:
\int_0^\infty \frac{a (x^2  1)^2  2 x (x + a)^2}{(x + a)^3 (a x + 1)^3} dx =...

Aug1910 03:20 AM
JJacquelin

9 
1,264 
(Note: cross posted to DevMaster)
Hey everyone,
As we know, the arc length of a cubic Bezier spline is kinda...

Aug1810 11:54 PM
Reedbeta

1 
1,458 
In a book of math puzzles Peter Winkler discusses the sequence x, x^x, x^x^x, x^x^x^x and writes about conditions for...

Aug1810 11:30 PM
starfish99

2 
1,342 
I have read in a book about bound vectors that we can not move them i mean that they can not move parallel to any...

Aug1810 08:49 PM
hoshii

8 
4,726 