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

Feb2313 09:24 AM
micromass

1 
40,044 
O.K. , this question is inspired by a physics class I'm taking where we're working out the expectation values of wave...

Feb614 10:57 PM
Shyan

1 
292 
I know what a complex number is. Learned it way back when I took college classes. I know it is a number that has a...

Feb614 10:56 PM
Pythagorean

1 
315 
Can anybody please help me understand the computation of the integral in the attached image. I shall be grateful.

Feb614 09:33 AM
HallsofIvy

3 
388 
I can't seem to quite comprehend the level curves for f(x,y)=xy. I realize this should be very simple yet the answer...

Feb514 11:49 PM
Shyan

1 
342 
What's the difference between these three?
I only know Taylor series and its variants which I suppose is called power...

Feb514 06:18 AM
Avichal

2 
315 
hey pf!
can someone please explain physically what the dyadic product represents: \vec{a} \vec{b}
i know its a...

Feb514 12:36 AM
joshmccraney

3 
336 
Here is the beast
\iint_{(ax+\mu _{1})^{2}+(bx+cy+\mu _{2})^{2}\leqslant z}\frac{1}{2\pi \sigma...

Feb414 12:06 PM
Jeff.Nevington

2 
1,082 
Has anybody got an idea how to solve this integral. I tried integration by parts, and that made the things even more...

Feb214 05:23 AM
D H

1 
396 
hey pf!
can someone comment on this statement i believe to be true: a simply connected, curlfree vector field is...

Feb114 01:57 PM
FactChecker

10 
607 
I've been taking calculus for a while now and I was just wondering why natural logarithm is abbreviated as "ln" and...

Jan3114 12:18 PM
Jhenrique

8 
659 
If x^n=y^n , n= odd
Then x=y
I know that an odd is n=2k+1
So x^(2k+1)=y^(2k+1)
I don't know how to finish...

Jan3014 04:41 PM
Mark44

1 
371 
I want to show that a function x(a,b) is bounded by some value l, knowing that the extremes of the function occur when...

Jan3014 10:00 AM
jgens

10 
500 
Hey, everyone.
I am trying to find the power series of secant from the known power series of cosin, but my answer...

Jan2814 09:44 PM
HallsofIvy

1 
345 
Hey,
I am rather stuck on this gaussian integral....
I have come this far, and not sure what to do now:
\int...

Jan2814 03:17 PM
mathman

1 
366 
I'm teaching a course using D. V. Schroeder, An Introduction to Thermal Physics, and there is a "derivation" in the...

Jan2714 09:01 PM
FactChecker

5 
546 
I have thomas calculus 12th edition, I like it, I study and understand calculus, but i need somebody to recommend...

Jan2714 08:31 PM
FactChecker

6 
543 
hey pf!
i'm trying to get a geometric understanding of the fundamental theorem: \int_a{}^{b}f'(x)dx=f(b)f(a)...

Jan2714 08:12 PM
FactChecker

4 
408 
Hi guys, I'm a bit rusty on optimization, but i remember enough to be able to setup some problems that I am facing in...

Jan2714 07:51 PM
FactChecker

5 
399 
Hello all,
Suppose I have a simple 1D signal and I want to compute the hessian. In that case, it should generalise...

Jan2714 11:08 AM
Stephen Tashi

1 
332 
I have been reviewing some details on the Dirac Delta function and I've hit a
little bit of a road block with trying...

Jan2614 10:57 AM
WannabeNewton

3 
428 
A limit of a sequence is definetely convergent if:
If for any value of K there is an N sufficiently large that an >...

Jan2614 04:40 AM
tinytim

1 
358 
http://en.wikipedia.org/wiki/Partial_fraction_decomposition
In general, if you have a proper rational function,...

Jan2514 09:52 PM
MathewsMD

6 
463 
Hey PF. I was wondering if anyone can help me figure out i can tell if certain functions are even or odd. For example,...

Jan2414 05:59 PM
PeroK

6 
391 
I have to integrate
partial^2f/partialx^2 partial^2f/partialy^2
in the variable xy
How to do this?

Jan2414 08:18 AM
HallsofIvy

1 
373 
Hi,
I'm working the following paper ""Plane waves viewed from an accelerated frame, K Srinivasan, L Sriramkumar, T...

Jan2314 10:07 AM
Jip

0 
429 
How do you tell if a limit is infinity, and you should use that approach, or if you should try to factor/multiply by...

Jan2214 10:38 AM
Mark44

1 
371 
Had this question on a test today, Find the shortest distance from the origin to the surface
xyz2=2
I figured...

Jan2114 10:27 PM
HallsofIvy

4 
511 
I've been dealing with several integrals involving rational functions. I have encountered myself arriving to an...

Jan2114 05:06 PM
mr_sparxx

2 
421 
Hi all!
I'm trying to solve the Schrodinger equation for a fusion process. I came up with this integral
\int...

Jan2114 03:12 PM
phyzguy

3 
376 
Hello,
I was wondering if such a thing even exists, so here it goes... Let's say I have a function x(s) (it is real,...

Jan1914 05:51 PM
strangerep

5 
471 
I'm trying to implement a numerical code for the diffusion equation with moving boundaries. I have no problems with...

Jan1914 12:05 PM
babagoslow

2 
394 
Hi all, this question stems from a homework question but is not the homework question itself, more a discussion on...

Jan1914 05:05 AM
jimbobian

2 
379 
As a way of practicing my Latex skills and asking about antiderivatives.
Suppose we have
\int\frac{1}{x^2 + a}dx
...

Jan1814 02:13 PM
D H

16 
909 
Hi,
I have read that zeta(x) = 1^(x) + 2^(x) + 3^(x) + ... infinity
for x = 1, zeta(1) = 1 + 2 + 3 + 4 + 5 ......

Jan1714 11:06 AM
Office_Shredder

1 
443 
Hi there. I've been trying to solve the integral of 1/(1+cosh(x)). I use Wolfram to give me a detailed solution but I...

Jan1714 06:06 AM
FelixHelix

5 
435 
Hi everyone!
I'm not sure if this is the right forum to post my question. If i'm wrong, let me know it.
The...

Jan1714 04:14 AM
Grufey

6 
658 
Just curious:
Are there any unique relationships b/w the inverse of a function and the original, specifically when...

Jan1514 10:12 PM
MathewsMD

7 
814 
I've been looking for this identity: arctan(1/x) = arcot(x) or arccot(1/x) = arctan(x)
After just visually...

Jan1514 08:25 AM
HallsofIvy

4 
637 
How does this:
\int_0^\infty\frac{x^{m1}}{1+x} dx
equal
\frac{\pi}{sin(m\pi)}
?
It has been simply stated as a...

Jan1514 05:15 AM
maajdl

4 
417 
Hi,
Recently in class, my professor went over a relationship that exists between trigonometric functions, T(x),...

Jan1414 07:24 PM
Simon Bridge

3 
662 