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

Feb2313 09:24 AM
micromass

1 
40,051 
hi, i was readin through a text book on electrodynamics and this integral has stumped me  can someone please tell me...

Apr2110 10:16 AM
elect_eng

5 
1,104 
I'm studying for a test.
How do I find the flux of the vector field F = (1,1,1) down through the surface \sigma,...

Apr2110 02:46 AM
squenshl

8 
1,537 
Another question of a practice test.
How do I use the Divergence theorem to find the outward flux of the field F =...

Apr2110 01:14 AM
squenshl

2 
806 
hello,
i am under the impression that the takeitorleaveit ("buy it now") price that maximizes expected revenue...

Apr2010 02:36 PM
citrusvanilla

1 
794 
Let \{h_n\} be ANY sequence of real numbers such that h_n \neq 0 and h_n \to 0. If f'(x) exists, do we have
f'(x)...

Apr2010 09:00 AM
HallsofIvy

4 
892 
I am confuse with this:
Let\;\; t=jx \;\;,\;\; j =\sqrt{1}
\Rightarrow \frac{dt}{dx}=j
But if I use...

Apr2010 01:52 AM
yungman

2 
921 
Here is another approach to finding the volume :
Let x_{1} be a point in such that :
f(x_{1}) = minimum value...

Apr1910 07:13 PM
evagelos

0 
668 
In doing math I try not to memorize shortcuts/simplifications, but instead understand what's happening. When studying...

Apr1910 02:06 PM
physlexic

3 
1,123 
I want to show x>abs(x) is not differentiable at 0
Some techniques in analysis are required.... how should i do?

Apr1910 08:25 AM
Landau

3 
856 
sorry

Apr1910 02:04 AM
physlexic

1 
820 
I don't understand how to set up the washer and shell equations. When you are given the function and the line to...

Apr1910 02:02 AM
physlexic

5 
42,764 
I was looking up how pi was derived, and found this:
http://mathforum.org/library/drmath/view/52589.html
...

Apr1810 09:37 PM
Werg22

1 
9,585 
Hello everyone,
This might be a bit of a silly question. Just looking at the definition of a gradient of a scalar...

Apr1810 04:13 AM
pamparana

2 
847 
The definition of entire function in complex analysis is
'If a complex function is analytic at all finite points of...

Apr1710 10:11 PM
emptyboat

3 
996 
In Dodelson's cosmology book it is claimed that
"For large x, J_0(x\theta)\rightarrow P_{x}(cos\theta)".
Does...

Apr1710 07:57 PM
nicksauce

1 
644 
Hello
I've been told that a (real) Lipschitz function (f(x)f(y)<Mxy, for all x and y) must be differentiable...

Apr1610 12:06 PM
snipez90

1 
1,236 
Given the function: f: (0,1) => (2x+1,4x) ,find sup{f(x)_{E} :xε(0,1)}
where "E" is for Euclidean norm

Apr1610 09:20 AM
evagelos

10 
1,124 
One of the basic vector identities is
\nabla \cdot (\nabla f \times \nabla g) = 0
Is this true if f and g are...

Apr1610 06:55 AM
phyzguy

1 
799 
why sometime we need to reverse the order of integration?
and how to determine the new limit?
for example: for...

Apr1510 08:53 PM
LCKurtz

3 
2,046 
Calculate the summation of i=1 to inf of the summation of j=i to inf of p^(j+i).
Yes, it is the summation of a...

Apr1510 03:27 PM
mathman

1 
983 
what does the ^ symbol mean in stochastic calculus?
e.g. for the first passage time \tau, we may write
k^\tau what...

Apr1510 01:10 PM
tennishaha

0 
756 
When I plug in this "{x,0,0}/x^3", here: http://www.wolframalpha.com/
...it plots some range for x=1 to x=+1,...

Apr1510 11:10 AM
N_F

4 
854 
what is the different between line integral and surface integral?
If we parameterize curve by x=t , y=t , what is the...

Apr1510 09:18 AM
nothGing

6 
872 
http://arxiv.org/abs/0812.3356
http://arxiv.org/abs/1004.2062

Apr1510 06:59 AM
sEsposito

1 
1,408 
Hi, everyone!
I have a problem in understading the change of variables in double integrals. Here is an example...

Apr1510 05:02 AM
HallsofIvy

9 
5,882 
Online integrator: http://www.wolframalpha.com/
\int \int (x,y,z) \times (x,y,z) \times (x,y,z)
\int_{L1}...

Apr1510 12:53 AM
N_F

2 
6,143 
I've heard that there are some types of functions that are impossible to integrate. Can I see an example and why so?
...

Apr1510 12:35 AM
shree007

18 
4,895 
Does Stokes's theorem imply that the flux integral of a curl of a vector field over a closed surface is always zero?...

Apr1410 08:35 PM
LCKurtz

1 
1,248 
"Let fk be functions defined on Rn converging uniformly to a function f. IF each fk is bounded, say by Ak, THEN f is...

Apr1410 03:52 PM
mathman

7 
1,634 
Please delete. Erroneous post.

Apr1410 07:44 AM
MASH4077

0 
558 
"Let (V,.) be a normed vector space. Then by the triangle inequality, the function f(x)=x is a Lipschitz...

Apr1410 07:42 AM
evagelos

7 
1,336 
Hello,
How to prove this equality:
N\,\overline{\gamma}\sum_{k=0}^{N1}(1)^k\frac{{N1\choose...

Apr1410 03:19 AM
S_David

2 
824 
how can we prove that lun x is continuous over (0, \infty )?
Provided that we define : lun x =y <=> e^y =x?

Apr1310 04:56 PM
mathman

3 
828 
Someone told me that a continuous function that is Lipschitz is differentiable almost every where. If this is true how...

Apr1310 01:49 PM
VeeEight

1 
640 
I once wanted to find the nth order Fourier approximation for f(x)=x. Since this function is odd, the projections on...

Apr1310 01:30 PM
LCKurtz

1 
588 
For a graph of any function, one of following conditions is said to exist so as for it to be symmetric:
a graph is...

Apr1310 12:55 PM
Danish_Khatri

2 
1,476 
Hello. I'm new to vector calculus and I had a question about the following integral:
\int_{C} x dy please note that...

Apr1310 10:56 AM
nonequilibrium

2 
626 
Firstly, I want to note I'm a post college student who is attempting to teach himself calculus. I'm reading Calculus...

Apr1310 08:23 AM
brennon80

4 
1,400 
My question is about the coefficients of a complex laurent series. As far as I know, there are three kinds of series:...

Apr1310 07:21 AM
Urmi Roy

12 
4,239 
Near what points (x,y,z) does
e^{yz}x^2 zln{y}=\pi
have a solution for y in terms of x and z

Apr1310 05:26 AM
Eynstone

1 
973 