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

Feb2313 09:24 AM
micromass

1 
40,008 
Design the optimal conical container that has a cover and has walls of negligible thickness. The container is to hold...

Apr1011 12:08 PM
tinytim

7 
1,173 
I innocently gave my students a problem: Which differentiable functions f: R \rightarrow R are bijective?...

Apr1011 07:45 AM
Citan Uzuki

13 
2,496 
Hello, I actually have an exam coming on series, sequences, polar coordinates and parametric equations. The only major...

Apr911 02:47 PM
matiasmorant

1 
577 
Given that 1/x is symetric across y=x, why can't we say \int^1_0 1/x  x dx= \int^\infty_1 1/x + x dx? Geometrically,...

Apr911 01:48 PM
TylerH

2 
2,787 
Hi,
I am doing work that requires me to take the derivative of an integral over a distribution. I believe I...

Apr811 04:37 PM
bob_johnson

8 
1,809 
Hi, given
u(x,t) = \int_{t_o}^t \left(Sech^2(xct_1)Sech^2(x+ct_1)\right)g(tt_1) dt_1
and g(t) \to 0 \quad...

Apr811 01:49 PM
nickthequick

0 
1,567 
I'm a selflearner (so far) when it comes to Calculus. I have completed College Algebra (with a grade of B) and...

Apr811 12:41 PM
Stephen Tashi

12 
5,003 
\ Is \ \mathbb{N} \ dense \ in \ itself.

Apr811 12:06 PM
Landau

8 
1,315 
Are there any circumstances under which we can conclude that, for an invertible, bounded linear operator T,
\...

Apr811 11:54 AM
AxiomOfChoice

3 
8,461 
Suppose u(x) is periodic with period 2\pi. Also m\le u(x)\le M.
Then is it possible for some derivatives of u(x) to...

Apr811 11:51 AM
Charles49

4 
1,773 
Hey all, so I need to find 4th degree taylor polynomial of f(x)=sec(x) centered at c=0
Can I just use substitution...

Apr711 09:22 PM
XCyoungX

14 
12,867 
We have been using some chapters from this textbook (1995 edition, ISBN: 9780070602281) in my Advanced Calculus...

Apr711 08:51 PM
Disinterred

3 
3,039 
Hello,
Lets say I have three operators
k_3=\partial_\phi,...

Apr711 03:24 PM
jfy4

0 
544 
Hi,
I did not understand the following:
We have : Partition is always a "finite set".
A function f is said...

Apr711 03:06 PM
lavinia

8 
1,031 
I've never really thought about this before, but today it hit me: Why do we define the Fourier transform of a function...

Apr711 09:37 AM
I like Serena

8 
6,427 
I came across this question. We're looking for the conctd components of this set of circles: centered at (0,1) and...

Apr711 08:12 AM
lavinia

4 
790 
Hi guys, can anyone help me with evaluating this:
\int^{}_C y \,ds where C is the curve (x^2+y^2)^2=r^2(x^2y^2)
...

Apr711 07:41 AM
HallsofIvy

4 
1,092 
For particle location, perturbation theory, etc, I see the following integral.
\LARGE \int_0^t { e^{i\omega...

Apr711 07:36 AM
HallsofIvy

1 
1,219 
Though I know that the limit as x approaches 0 of x^x is 1, I can't prove it...
...can anyone please help me?

Apr711 03:19 AM
Bassalisk

6 
5,186 
I have been looking at this problem for quite some time and have been unable to figure out how to approach it.
the...

Apr611 03:03 PM
HeisenBerg46

3 
1,240 
The other day I stumbled across a certain integral that had a threeletterabbreviation that I believe began with A. I...

Apr611 01:57 PM
HeisenBerg46

0 
1,109 
I recently read a paper on fractional derivatives. That is how to take derivatives of fractional order rather than the...

Apr611 09:31 AM
starzero

3 
1,134 
I need some feedback about something that does not make sense.
The parabola and hyberbola can be found in the...

Apr611 06:48 AM
94JZA80

19 
2,737 
Given a+b >=c , I'm trying to obtain values of p such that a^p+b^p>=c^p. Obviously,
for p>1 the relation does not...

Apr611 06:01 AM
onako

1 
722 
Hi there,
I'm new to this community, but I think I need some help. Have been trying to analytically compute the 2D...

Apr611 01:50 AM
sooke

0 
1,380 
How would you integrate product of heaviside function and function of x
i.e. int
Thanks

Apr511 04:43 PM
mathman

3 
2,069 
Hi all,
I've reason to believe that the function
f(q)=\int\frac{d^{4+n} k}{(2\pi)^4}\frac{1}{(a \cdot k i...

Apr511 01:58 PM
muppet

1 
474 
For months I have been staring into this expression, and I cannot visualize what the hell omega represents...
...

Apr511 12:58 PM
Bassalisk

4 
825 
We know that every discrete metric space with at least 2 points is totally disconnected.
Yet I read this:
A MS that...

Apr511 12:33 PM
Bachelier

6 
1,294 
A Union of a FINITE collection of closed sets is closed. But if it is an infinite collection?
Can someone provide an...

Apr511 12:04 PM
Bachelier

2 
841 
What led to the definition of the Laplace transform ?

Apr511 11:19 AM
neginf

0 
456 
I've been studying Turbulence, and there's a lot of averaging of differential equations involved. The books I've seen...

Apr411 11:01 PM
lurflurf

7 
1,508 
This is a question i hope someone on the forum can help me answer.
Recently In a lab i had this question pop into my...

Apr411 10:16 AM
Stephen Tashi

1 
973 
Hi,
If we consider Rolle's Theorem:
"If f is continuous on ,
differentiable in (a,b), and
f (a) = f...

Apr411 07:57 AM
HallsofIvy

2 
771 
Can some one help me to understand this:
I need to use the second shifting theorem to get the Laplace transform,...

Apr411 02:02 AM
Too Easy

1 
3,308 
Hi,
First off, im not doing a course in physics or maths so excuse me if this is a very basic question. I have the...

Apr311 11:54 PM
Stephen Tashi

1 
637 
Hi
I have tried to integrate the following equation \int(3x^{2}+4)(2x^{3}+8x)^{4}dx
I have tried to expand the...

Apr311 10:59 PM
dvmaz

2 
5,496 
The question states:
Suppose that f:R>R is continuous and that f(x) in the set Q (f(x)eQ) for all x in the Reals...

Apr311 06:27 PM
Halen

15 
1,334 
the question states:
suppose that f:(0,1)>R is a (strictly) increasing function.
suppose also that there is a...

Apr311 06:16 PM
Halen

2 
965 
My professor tried to show the following in lecture the other day: If T is a linear operator on a Hilbert space and...

Apr311 04:35 PM
AxiomOfChoice

4 
852 