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

Feb2313 09:24 AM
micromass

1 
40,144 
Hi folks,
I'm trying to get from the established relation:
$$ \int_{\infty}^{\infty}...

Feb2812 04:08 PM
mathman

3 
918 
I have begun to read about the hyperreals, and am wondering whether the natural extensions of realvalued functions to...

Feb2812 03:32 PM
Bacle2

7 
1,817 
\int_0^1\expx^{3/2}dx, where 0<x<1, a>0, b>0.
I know there is no closed form, and it goes to infinity for some...

Feb2812 09:16 AM
spinblue

1 
747 
Hi all.
Suppose that we want to compute the following indefinite integral:
...

Feb2812 07:02 AM
AdrianMay

1 
919 
Someone told me Isaac Newton developed some infinitesimal triangle series to find the area of a random blob, but I...

Feb2712 08:13 PM
Jorriss

3 
1,596 
When I am reading the paper about Rayleigh instability, I found this type of expanding method.
...

Feb2712 07:30 PM
Chuck88

4 
950 
Take a look at the following problem:
"A rubber band with initial length L has one end tied to a wall. At t = 0,...

Feb2712 10:37 AM
joebevo

0 
712 
Hello there,
I found in a book a proof of the fact the space of piecewise constant functions with a finite number...

Feb2712 09:39 AM
muzialis

0 
730 
Have you ever see any books discussing these problems? I don't know the name of these topic.

Feb2712 07:58 AM
micromass

1 
733 
Lets say I want to integrate sin from 0 to pi
The answer is 2
But how do visualize it in terms of the graph?
...

Feb2712 06:09 AM
quietrain

8 
1,214 
If a function is convex on (\infty, \infty) then can we say that this function is continuous on (\infty, \infty) ?

Feb2712 04:53 AM
fderingoz

0 
682 
Hey All,
I am trying to evaluate the limit:
\lim_{x\to 0^{+}} \frac{\delta''(x)}{\delta''(x)}
Where ...

Feb2712 03:14 AM
Hurkyl

3 
1,065 
So I don't understand why if you have something like U(x,y) = f(y+2x)
and you take \frac{\partial U}{\partial x}
...

Feb2612 11:19 PM
wumple

2 
1,277 
Hi,
I have the following complicated integral willing to integrate numerically. The integral is:
\int...

Feb2612 06:37 PM
architect

0 
1,301 
I'm trying to prove, per ex. 5 of section 2.2 of S. Berberian's Fundamentals of Real Analysis, that where \lambda^* is...

Feb2612 12:00 PM
morphism

1 
1,133 
I have a set of N data points defined over a periodic interval, 0\le x \le 1.
I made a discrete fast fourier...

Feb2612 05:27 AM
matteo86bo

0 
712 
Hi,
In high school, I was shown an unconventional but quicker way to find max/mins. I'm not sure how common it is...

Feb2512 01:56 PM
nth.gol

2 
831 
I have been working on a problem proposed in a math journal, and there is only one thing I need to figure out. Here...

Feb2512 01:27 PM
alexfloo

1 
1,025 
If C is a simple closed contour such that w lies interior to C, and n > 1, then
\int_{C} \frac{dz}{(zw)^n} = 0. I'm...

Feb2512 11:11 AM
Unit

5 
1,284 
Have the following question and just wondering if my solution is correct
Let g(x)= x^5+3x1. Show that there are no...

Feb2512 11:01 AM
Mark44

3 
940 
So I came across a problem that said to use usub to solve:
integral(x^4sinxdx)
But the only way I could think...

Feb2512 06:44 AM
tinytim

1 
991 
My textbook (Taylor, Classical Mechanics) and professor introduced the concept of \nabla_{1}
to mean "the gradient...

Feb2512 12:30 AM
lugita15

3 
1,096 
I posted a problem called "estimating eigenvalue of perturbed matrix" in the section 'Linear and abstract algebra'...

Feb2412 10:54 PM
julian

2 
650 
We can show that
\int_{0}^\infty e^{kx}dx=\frac{1}{k}
for real $$k>0.$$
Does this result hold for $$\Re...

Feb2412 05:02 PM
Charles49

2 
856 
I'm curious if 1/x ~ 0. Technically by the definition I know it's not since lim x→∞ (1/x)/0 = ∞. But I feel like it...

Feb2412 03:20 PM
alexfloo

8 
1,141 
On a quiz, a true/false statement was given along the lines of:
"The gradient is a specific example of a...

Feb2412 03:10 PM
genericusrnme

12 
1,655 
Ok I can do the integral and see that it is equal to 2∏i, but thinking about it in terms of 'adding up' all the points...

Feb2412 09:26 AM
Bacle2

22 
2,551 
The stupid question of the day.
Is it fair to say that\frac{du}{dx} = \frac 1 {dx/du}
since this comes (I think)...

Feb2412 07:36 AM
dodo

2 
1,190 
I am having a hard time understanding how to parametrize the function y = sin(x) into component form (i,j).

Feb2412 07:06 AM
HallsofIvy

4 
1,078 
http://en.wikiversity.org/wiki/The_necessities_in_DSP
It seems great, but I don't know really. I think someone can...

Feb2312 10:04 PM
Ask4material

0 
865 
I actually made this question up while studying some chemistry. The problem is easy to visualize, but I'm trying to...

Feb2312 07:31 PM
Bipolarity

12 
1,091 
I understand everything in the proof except the last step I have written here. What comes after, I understand.
How...

Feb2312 10:02 AM
RUMarine

4 
1,148 
"In his studies on Fourier Series, W.H.Young has analyzed certain convex functions \Phi:IR\rightarrow\bar{IR}^{+}...

Feb2312 09:05 AM
fderingoz

0 
1,148 
Total variation is defined by
\Delta f=\delta f+\Delta x
For example f(x,y)=yx, y=y(x)
\Delta f=x\delta...

Feb2312 06:55 AM
matematikuvol

2 
1,037 
Hi,
How can I set a table in mathematica to count by a specified value, rather than the preset 1. For example, if I...

Feb2212 08:08 PM
iceblits

0 
875 
Wondering whether somebody could help me with a quick integral??
dp/dt = ap(1(p^2/q^2))
initial condition p(0) =...

Feb2212 04:23 PM
phyzguy

3 
1,150 
I wonder why z^(1/2) cannot be expanded in Laurent series with center z=0. Anyone knows?

Feb2212 03:30 PM
jackmell

2 
1,031 
Hello, I am just starting to learn limit evaluation techniques. I am unsure of the method used in this case.
(x^3 +...

Feb2212 10:14 AM
qazi75

5 
1,081 
note that by limit I mean the calculus operation, as in limf(x) as x>a.
I was playing around with numbers earlier...

Feb2212 08:52 AM
HallsofIvy

10 
5,538 
Hi all,
I have a set of data that is number of counts  vs  angle. I need one angle for a calculation. I need to...

Feb2212 01:16 AM
chloealex88

0 
618 