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

Feb2313 09:24 AM
micromass

1 
40,062 
Hey folks just wondering whether anyone here knew of a series for cos(x) that converges fairly quickly for values...

Jun2311 05:04 PM
TylerH

2 
569 
Esteemed Analysts:
I am trying to rigorize the result that if f is 11 in a region R, then f'(z) is not zero in...

Jun2311 05:33 PM
Bacle

10 
1,505 
Hi everybody
I have a state space model consisting of 7 states of which 4 are measuerable and I would very much like...

Jun2411 05:28 AM
rabun

0 
881 
I am just starting to do double integrals and came acorss an issue. I remembered from single integrals when we...

Jun2411 05:48 AM
HallsofIvy

4 
1,956 
I have seen in some textbooks that the value of integrals are treated differently.
In one textbook it said to...

Jun2411 08:42 AM
Stephen Tashi

4 
818 
I'm trying to understand why monotone functions can only have jump discontinuities. I've seen formal proofs, but I...

Jun2411 08:43 AM
lugita15

3 
1,814 
Is there any difference between a limit that is undefined and a "does not exist"?
From what I think,
Undefined...

Jun2411 09:22 AM
BloodyFrozen

2 
1,778 
Hi,
I know that to approximate the divergence of a vector, when you have two nodes on two sides of a face, say:...

Jun2411 11:32 AM
hoomanya

0 
489 
Say I have the Fourier Transform, F, of a Gaussian function,
...

Jun2411 01:02 PM
Spinnor

0 
1,002 
This discussion is that of converting infinite series to infinite products and viceversa in hopes of, say, ending the...

Jun2411 01:36 PM
Planck37

3 
10,995 
There are line integral with respect to arc length and line integral with respect x/y.
I know \int_C Pdx+Qdy is...

Jun2411 05:25 PM
LCKurtz

1 
522 
Find the limit of (4kx + 9)/(45x + 3) as x>inf, when K=5, K<5, K>5.
Answer: I divided each term by the highest...

Jun2411 06:47 PM
MurdocJensen

5 
692 
A book on which I am studying (Arfken: Mathematical Methods for Physicists), uses the following result in order to...

Jun2511 05:56 AM
bruno67

2 
882 
I was reading Spivak's Calculus on Manifolds and in chapter 1, section 2, dealing with compactness of sets he mentions...

Jun2511 08:03 AM
HallsofIvy

5 
1,083 
I am trying to calculate an integral of the form
I=\int_{0}^{\infty}\exp(iax)\frac{(x^2+b^2)^{c}}{x+id}dx,
...

Jun2511 10:08 AM
nonequilibrium

5 
1,418 
How do I calculate the integral
\int_{ix}^{i\infty} e^{t} t^{s1}dt,
where x>0, s>0? Mathematica gives...

Jun2511 07:07 PM
Mute

2 
728 
I'm trying to find the general form for the nth derivative of
f(x) = \frac{1}{x^m \log x}
where m can be...

Jun2511 08:23 PM
rsq_a

0 
792 
Dear all,
I want to solve the Volterra integral equation (of 2nd kind). But I only need to solve it analytically...

Jun2611 02:30 PM
perr

6 
811 
let be a rational function of 'n' variables
\frac{P(x1,x2,.....,xn)}{Q(x1,x2,.....,xn)}=R(x1,x2,x3,..,xn)
then...

Jun2611 04:10 PM
zetafunction

0 
494 
lim as x > 0, 1/22]/x
That's the limit I want to evaluate. I keep running into problems getting to the real...

Jun2611 06:03 PM
MurdocJensen

8 
1,233 
Dear all,
Please help me to prove the Fourier expansion for three different cases as follows. I need some help to...

Jun2611 07:06 PM
kaizen.moto

4 
843 
Prof. Putinar,
Guillera & Sondow gave
e^{x}=\prod_{n=1}^{\infty}\left(\prod_{k=1}^{n}...

Jun2711 01:08 AM
benorin

3 
2,142 
(Hopefully, this question falls under analysis. I was unable to match it well with any of the forums.)
The proof...

Jun2711 05:57 AM
HallsofIvy

6 
1,467 
Suppose f \in L^{4/3}(\mathbb{R}^2) and denote its Fourier transform by \mathscr{F}(f). Is it true that the function...

Jun2711 06:16 AM
feynman456

0 
640 
This is a problem related to julia sets but its more of a mathematical problem so I posted it here.
x= x^2  2
...

Jun2711 12:35 PM
gursimran

2 
832 
Very simple question:
Let x^0,x^1,...,x^n be some fixed coordinate system, so that the infinitesimal volume element...

Jun2711 12:49 PM
HallsofIvy

2 
899 
Could someone kindly explain whether the 90 degree phase difference between sine & cosine functions contribute to the...

Jun2811 12:07 PM
LCKurtz

1 
1,018 
Hi,
Just a simple, quick question:
Does the gradient of a vector give a scalor or a vector?
Thanks!

Jun2811 12:42 PM
qbert

4 
794 
While reviewing basic calculus, I noticed that the curve (1+t^2,t^2,t^3), which clearly has a cusp at (1,0,0), has a...

Jun2811 04:42 PM
LCKurtz

4 
1,303 
Hi,
Say you want to use a proof by contradiction to prove that a sequence diverges. So you assume that x(n)>...

Jun2911 03:20 AM
SteveL27

4 
963 
My class, teacher included, cannot seem to figure out the integral of the square root of tan x. Maybe someone here...

Jun2911 03:30 AM
julianze

36 
41,561 
The implications of Heine Borel Thm are not immediate to me. Any results are derived from this theorem?

Jun2911 11:31 AM
micromass

1 
1,017 
I'm looking for a convergent sequence s_n such that:
lim_{n\rightarrow\infty}n(s_ns_{n1})=\infty
I've already...

Jun2911 01:58 PM
LCKurtz

6 
992 
hey.
I used to be quite talented at math, but I've let my talent deteriorate in the ~10 years since my last...

Jun2911 03:12 PM
I like Serena

2 
1,120 
This is what I want to say:
The squeeze theorem may be used when direct substitution and factoring (or...

Jun2911 06:44 PM
MurdocJensen

0 
881 
http://imageshack.us/photo/myimages/835/mathproblem.jpg/
I was thinking of an interesting shape (I drew it in...

Jun2911 08:57 PM
Sczisnad

4 
883 
So sorry if this has been discussed elsewhere before. I know it may be trivial but for some reason I just can't get...

Jun2911 10:01 PM
andryd9

3 
1,240 
Hi everyone,
I have been studying "Optimization by Vector Space Methods", written by David Luenberger and I am...

Jun3011 05:52 AM
Fredrik

4 
1,322 
When we integrate a scalar map over a manifold M, what exactly are we measuring?
If M is the unit circle in R^2,...

Jun3011 11:02 AM
JG89

5 
1,320 
Hi everybody,
Please help me to find supremum & infimum of the set of rational numbers between √2 to √3
(ie) sup...

Jun3011 06:13 PM
mathman

2 
1,529 