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

Feb2313 09:24 AM
micromass

1 
45,397 
Supose a_n=f(n)
What is the relationship between convergence or divergence of:
\sum_{n=1}^\infty a_n and ...

Jun710 11:51 AM
estro

7 
2,358 
An example of implicit differentation in Stewart, 6th ed, p 883, is given as follows:
x^3 + y^3 + z^3 + 6xyz = 1
...

Jun710 01:24 AM
Mark44

1 
2,856 
If x_n\geq 0, y_n\geq 0 and \lim \limits_{n \to \infty }x_n exists, we have \limsup\limits_{n\to\infty}(x_n\cdot...

Jun710 12:12 AM
zzzhhh

3 
1,287 
I'm studying the nonlinearity effect of power amplifier on multicarrier signal. While modeling the behavior of power...

Jun610 11:26 PM
singhofmpl

2 
772 
I have a little question that's bothering me : Suppose you have a metric space X with a dense subset A. Can we say...

Jun610 03:26 PM
Landau

5 
1,359 
Dear all,
Someone could help me to understand how is mathermatically expressed the amplitude of the velocity...

Jun610 02:52 PM
arildno

8 
1,738 
Hi everyone, I have a graph here (not a homework related, just something i encountered in daily life) but it's in...

Jun610 11:08 AM
Mark44

8 
1,296 
hello maths experts
is the following true?
http://img9.imageshack.us/img9/4596/int15oe.jpg
graphically, this is...

Jun610 10:00 AM
nightworrier

6 
22,841 
I know how to calculate the divergence and curl of a vector field. What I am lacking is any intuition on what these...

Jun610 04:04 AM
mohammed.omar

3 
1,745 
Hi everybody :approve:
I'm having a lot of trouble remembering all of the formulas for differentiating inverse...

Jun610 12:31 AM
gerardhoyle

15 
1,470 
Who has a pdf copy of the book A Companion to Analysis...by Thomas Korner?

Jun510 05:10 PM
Landau

2 
1,413 
Hi all,
I need to evaluate the following equation :
\mathbf{n} \cdot \cdot\mathbf{n}
where \mathbf{n} is...

Jun510 11:21 AM
zyroph

0 
914 
given any function (or maybe distribution) f(x) and g(x) so
f(x+i\epsilon )  f(xi\epsilon ) = g(x)
if we...

Jun410 03:50 PM
mathman

1 
827 
Hey all. I'm trying to convert a series which gives me the magic constant for a magic square into an equation. How...

Jun410 03:49 PM
sjb2812

5 
2,516 
Hi
I have a question, if I have a function that is continuous on the interval where a <= b, why would integrating...

Jun310 04:17 PM
Red_CCF

5 
3,129 
I was wondering if there's an example of a power series \sum_n^\infty c_n (za)^n with radius of convergence R so that...

Jun310 10:29 AM
nonequilibrium

4 
2,252 
Hi all,
I was wondering if anyone could help me with a problem i've got at the moment:
I need to calculate the...

Jun310 08:22 AM
nowland7

0 
961 
Hi,
I asked this question in the quantum physics forum http://www.physicsforums.com/showthread.php?t=406171 but...

Jun310 03:32 AM
tom.stoer

0 
717 
Hi
This is a long story, I make it short:
I am working in a project where I need to find a matrix defined by a third...

Jun210 04:51 PM
alecrimi

1 
1,755 
These identities might be considered as true:
\begin{array}{rcl}
1  1 + 1  1 + \cdots & = & \frac{1}{2} \\
...

Jun210 01:00 PM
g_edgar

20 
2,303 
For some reason, I can not seem to evaluate this integral.
\int \frac{x}{ln(x)} dx
When I plug it into maple it...

Jun210 09:04 AM
Mute

6 
8,462 
The unit normal vector N of a given curve is equal to the first derivative with respect to t of the unit tangent...

Jun110 09:34 PM
lavinia

1 
2,361 
Hello,
How can I find the limit of x^{k}\mathrm{e}^{ax^n} for x\to +\infty.
a,k,n are positive reals.
I even have...

Jun110 08:57 AM
Char. Limit

9 
1,888 
My question revolves around the following derivative:
for z(x,y)
*sorry I can't seem to get the latex right.
...

Jun110 12:50 AM
Quisquis

5 
1,118 
How do you derive the hypervolume/hypersurface of the unit ball in n dimensions? I thought it'd be trivial but oh...

May3110 02:24 PM
Jerbearrrrrr

4 
817 
I've taken maths through calc 3.
I understand the Maclaurin series represents a function f(x) as a power series: ...

May3110 10:13 AM
HallsofIvy

3 
1,686 
So, I was reading the book "Riemann's Zeta Function", by H.M. Edwards, and on page 10 I see an integral I don't quite...

May3110 03:51 AM
jackmell

5 
1,272 
Let's find the Maclaurin Series of tanhx up to powers of x^5
Yeah! Good idea!
I know
Right, f(x) = tanh...

May3110 02:50 AM
tinytim

4 
4,312 
Dear All,
Its my first post on this the physics forum.
i have a question. Can we integrate double integrals...

May3010 09:38 PM
moonkhan

0 
3,182 
quick question, I was watching an MITOCW physics lecture and I want to know where a principle breaks down.
\int^t_0...

May3010 08:27 PM
some_dude

11 
1,458 
I have a function that is parametrized by a direction and returns a signal strength,
F(\theta, \phi) \rightarrow R...

May3010 06:14 PM
coderdave

0 
593 
Hello,
if I have a function f:\mathbb{R}\rightarrow \mathbb{C}, what are the conditions on f for which the derivative...

May3010 04:55 PM
mnb96

2 
1,485 
So i'm trying to find out what the procedure is to convert a cartesian unit vector to a cylindrical unit vector. Any...

May3010 12:45 PM
teslajet

2 
2,955 
My course notes state:
f(x+s) = f(x) + \nabla f(x+ts)^{T}s
for some t \in (0,1)
If f is twice...

May3010 10:23 AM
azay

0 
723 
I know that the Taylor Series of
f(x)= \frac{1}{1+x^2}
around x0 =...

May3010 01:12 AM
Chrispo

11 
54,589 
http://img526.imageshack.us/img526/6766/distrib.png
Just wondering if anyone could help me with finding the most...

May2910 07:20 PM
Jerbearrrrrr

0 
1,180 
How do I calculate
\int_C dz/1z when C is a line segment from 1/2 to \sqrt{3i}.
I know that in the complement of...

May2810 05:55 PM
jackmell

7 
1,006 
I need to figure this integral out for a graduate research project, however I've been stuck on it for days now:
int...

May2810 01:03 PM
tanderse

4 
2,247 
Hi,
I'm doing calc2, and I have hard time understanding and visualizing the idea of Taylor approximation in my head....

May2810 07:40 AM
estro

2 
805 
Hi All,
I have a question about notation.
Suppose I have an expression:
f(x,g(x,y))
I would like to know...

May2710 09:49 PM
gz_student

2 
756 