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

Feb2313 09:24 AM
micromass

1 
45,271 
Hi, I have a book that makes the equality.
\vec{B}dV = (\vec{e_1}B_1 + \vec{e_2}B_2 + \vec{e_1}B_2)dx_1 dx_2 dx_3...

May514 01:03 PM
AntiElephant

2 
659 
In the EulerLagrange equations y and y' are independent variables, while for a given curve y(x), they are related by...

May514 12:05 PM
JanEnClaesen

2 
424 
Consider the problem of solving overdetermined system
Ax = b;
In the problem I am trying to solve (from the...

May514 10:34 AM
Borek

5 
519 
Hi
I am unable to find the proof of the Lagrange inversion formula as given in...

May414 10:21 PM
Greg Bernhardt

1 
471 
I'm having trouble calculating the dS vector. I know there are multiple ways to find dS but can anyone explain them to...

May414 08:06 PM
Matterwave

10 
530 
Hi,
I am struggling with a problem, where in the middle of my calculations I need to determine a function...

May414 05:04 PM
HomogenousCow

4 
571 
I guess my first questions is whether saying that a function is differentiable is the same as saying that its...

May414 04:28 PM
micromass

25 
1,043 
So I'm just having a bad night about Lagrangian and Hamiltonian mechanics and I was deriving them all over again and...

May414 06:45 AM
HallsofIvy

1 
443 
A function ##f:\mathbb{R}^3_+\to## defined as ##f(\lambda,\beta,x)=1e^{\frac{\lambda}{\beta}\left(1e^{\beta...

May314 10:20 AM
mfb

5 
504 
I am doing some analysis and I have come up with the following integral:
\int \frac{e^{ax}}{1+be^{cx}}dx
where...

May314 09:48 AM
lurflurf

1 
381 
Hi all,
I understand the numerical difference between a Taylor and Maclaurin Series; Maclaurin series is just...

May314 06:53 AM
HallsofIvy

2 
531 
Hi guys, I'm not sure where to put this question, so I'll just put it here. If a mod knows of a better place, just...

May214 12:15 AM
Matterwave

5 
623 
Hello all, I'm new to the forums (signed up to ask this question this isn't a homework question). My friend gave me...

May114 06:58 PM
Chestermiller

6 
581 
Hi! I have a question about integrating a function with an infinite value. If you integrate a function with a place...

May114 03:45 PM
bmbuncher

5 
461 
I'm taking a Calc III Course and I want to know if anyone out there can help me with a few conceptual ideas. I know...

Apr2914 08:25 AM
SteamKing

3 
480 
Is there a formula for this gaussian integral:
$$int_{\infty}^{\infty}{x^4}{e^{a(xb)^2}}dx$$
I've tried...

Apr2814 10:47 PM
Matterwave

9 
537 
Let \normalsize S = \int ^{a}_{b} f dx be the functional i want to minimize. Why does \normalsize f (inside the...

Apr2814 05:08 PM
devd

3 
404 
Hey pf!!
I was thinking about how div(curl(f)) = 0 for any vector field f. However, is this true for div and curl...

Apr2814 02:20 PM
pasmith

2 
395 
I'm trying to understand this integral.
\int \frac {x^3 dx}{x^4 + 1}dx\\
One possible answer is this formula....

Apr2814 11:05 AM
micromass

5 
448 
I need to solve for the integral of f(x)=cos(x)/sqrt(1+x^2)
Integral calculating computers online all say that this...

Apr2714 08:56 PM
MarneMath

6 
421 
There is a large chunk of information necessary as a preface to my question, so bare with me for a paragraph or two. I...

Apr2714 07:47 AM
AlephZero

6 
499 
I'm having a hard time seeing how spivak derived this formula...
"6. The formula for 12+...+n2 may be derived as...

Apr2514 10:56 PM
slider142

4 
477 
Integrals containing \frac{1}{\sqrt{x^2+a^22xa \cos{\theta}}} occure frequently in physics but I still have problem...

Apr2514 10:16 AM
scurty

4 
447 
I don't quite understand the context of common tangent problems.
This is one of the problems I am trying to solve:...

Apr2414 09:59 PM
Simon Bridge

9 
468 
let D be simple connected Domain and C be simple close curve in D.
then by cauchy integral theorm ∫(z) dz over C ...

Apr2414 05:17 PM
homeomorphic

3 
371 
Hi!
Consider the function
\frac{d^n}{dx^n} \sum_{k=1}^m \sin{kx}, \quad 0 \leq x \leq \pi/2 .
If n is odd...

Apr2314 11:16 PM
Simon Bridge

1 
416 
Hello,
This might seem like a very basic problem for the most of you but I am a little bit confused as to the...

Apr2314 10:37 AM
Mr. Fest

6 
437 
So here's a little background for the question:
I have an arc that covers 3/4s of a circle (so it's not quite a...

Apr2214 05:12 PM
alpha754293

7 
475 
Hi,
I need some clarification on exactly which critical points are saddle points. The definition I am finding...

Apr2214 02:01 PM
D_Tr

2 
394 
Hello everyone,
I have recently bumped into the Kramers Kronig Relations while reviewing some of my Eletromagnetism...

Apr2114 08:29 PM
jbunniii

7 
459 
Say for some general function f(x), and g(x) = ∑x=0∞ f(x) (assuming function is defined)
Is there a way to find the...

Apr2014 03:30 PM
cmcraes

8 
521 
So I was doing my calc homework when I stumbled upon this thought:
lets say you were trying to find the solid of...

Apr2014 02:11 PM
SteamKing

1 
475 
Hi
I am facing a mathematical problem in my research. I am not a maths magor and i need to do this to move on with my...

Apr2014 12:58 PM
Aladdin123

22 
848 
I do not know how to formulate formulas on this forum so I just wrote it neatly on a piece of paper and linked it.
...

Apr1914 07:21 PM
Mark44

1 
352 
How is this limit evaluated?
\lim_{k>0}\frac{sin(\pi k)}{sin(\frac{\pi k}{N})}
I know that it is N, but I...

Apr1914 01:54 AM
JJacquelin

1 
483 
If exist a connection between the infinitesimal derivative and the discrete derivative $$d = \log(\Delta + 1)$$...

Apr1814 05:17 PM
Jhenrique

6 
382 
Hey guys, just trying to understand how the quotient rule is derived, so I head over to wikipedia and saw this:
...

Apr1814 02:14 PM
gomess

4 
439 
Hello,
I have a real world application that I need some help with. I am sensitive to the fact that this is not the...

Apr1814 01:12 PM
berkeman

2 
512 
Hello,
Wolfram is giving me the required answer however, the steps it uses I find very confusing. Can anyone share...

Apr1814 09:53 AM
Mark44

1 
381 
For my own use and consumption, I created a generalization of the nth integral of a function f and I'm posting it here...

Apr1814 03:03 AM
pwsnafu

5 
464 