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

Feb2313 09:24 AM
micromass

1 
46,076 
srry if this post is in the wrong section but i was wondering if there are actually precise and universally agreeable...

Mar1411 02:06 PM
Studiot

1 
1,101 
Wikipedia: Euler Lagrange Equation defines a function
L: \times X \times TX \rightarrow \mathbb{R}...

Mar1411 07:56 AM
homology

11 
1,848 
i don't really understand the dirac delta function in 3D.
is it right that integral of f(r)d3(ra)dt = f(a)
...

Mar1311 11:20 PM
quietrain

6 
3,648 
Hi, I've defined an integral transform that I'll call T (obviously very similar to the fourier transform):
...

Mar1311 07:57 PM
shaiguy6

1 
978 
Is there an analog or a more general form of the rule
\frac{d}{dx} \int_{a}^{t} F(t) dt = F(x)
that covers the...

Mar1311 08:50 AM
HallsofIvy

9 
3,200 
To show that some T(x,y) = something
is a metric on a set for which it is compact, we have to prove that it respects...

Mar1311 06:04 AM
HallsofIvy

2 
835 
Suppose you're looking at a complex vector space X, and you know that, for some x in X, you have f(x) = 0 for every...

Mar1311 05:57 AM
Landau

10 
1,593 
How does what you learn in precalculus relate to the physics that we use?
I'm in precalc right now so I find it...

Mar1311 05:18 AM
descendency

3 
1,570 
I do not understand how to calculate the sup\Omega and inf\Omega of a subset of R. So for example calculating the sup...

Mar1211 09:24 PM
Fredrik

4 
2,336 
If the sum of a sequence of functions a_n converges uniformly, how is it that the product of 1+a_n converges...

Mar1211 03:17 PM
ForMyThunder

2 
914 
hey there,
I just studied the whole taylor and laurent series, and I think I mixed them up alittle.so heres what I...

Mar1211 02:52 PM
mathwonk

3 
2,729 
Hello Experts,
Please tell me where can I download a PDF of:
Edwards, C. H. (1994). Advanced Calculus of Several...

Mar1211 02:47 PM
mathwonk

1 
1,885 
Can someone please explain why the following three definitions for the norm of a bounded linear functional are...

Mar1211 02:03 PM
Landau

15 
4,750 
Heyo,
I'm having difficulty seeing how these two lines follow. I'm fairly sure I'm being an eejit and the answer's...

Mar1211 06:59 AM
homology

4 
604 
Ive come across a few derivations whereby a few changes that dont see so obvious to me occur.
For instance, this...

Mar1111 10:34 AM
HallsofIvy

1 
619 
Need an open cover with NO FINITE subcovers
{x ∈ Q : 0 ≤ x ≤ 2}
I was thinking: {A_n} n = 1 to infinity s.t.
...

Mar1011 01:53 PM
Bachelier

12 
3,649 
I am unsure as to how to prove a that as the limit as n goes to inifinity of a certain function the answer is 2.. I am...

Mar1011 06:10 AM
HallsofIvy

1 
1,911 
Dear friends can you show me please an example of a sequence of integrable functions fn:R>R converging to an...

Mar911 11:32 PM
AxiomOfChoice

2 
1,555 
Given the interval \in lN
Is there any reason we should stay to the boundaries of the set we're trying to cover?
...

Mar911 11:29 PM
AxiomOfChoice

4 
2,090 
integral of (sinx)^2 / (x^2) from infinity to infinity. how to tackle this

Mar911 11:09 PM
lurflurf

4 
861 
I don't understand this point:
Given the open set E = U_(a in L) I_a. Union of open intervals
We're showing this...

Mar911 10:57 PM
chiro

4 
1,202 
Hi,
In general if a function is not Riemann integrable does this mean the function is also not Lebesgue integrable?...

Mar911 10:49 PM
mathwonk

30 
5,218 
I was told an analytic complex functions has the same derivation value at z0 (random point) however you approach z0....

Mar911 10:46 PM
mathwonk

7 
1,284 
If A=(A1,A2,A3) and B=(B1,B2,B3), WHAT does this notation mean? :
(\vec{A} \times \vec{B})_\bot

Mar911 04:54 PM
nicksauce

1 
1,085 
Hey all,
I was reviewing the concepts of how to derive the formula for the surface area, namely..
SA=\int \int...

Mar911 10:57 AM
Xyius

7 
2,017 
Ok my last post was trivial, but it led to this question
Assume f is unbounded and analytic in some domain D, and...

Mar811 06:27 PM
Hyperbolful

2 
1,777 
There's this text that is supposed to help us with some problems in one competition (I could send the link, but it's...

Mar811 04:25 PM
lurflurf

2 
1,674 
Hello.
I hope I've chosen the correct place to post this. Apologies if it is not.
Could somebody explain the...

Mar811 01:01 PM
hotvette

1 
1,162 
how would you use Taylor Series to answer this:
Find a value of h such that for x<h implies sin(x)=xx^3/6 +x^5/120...

Mar811 12:19 PM
dfillary

2 
1,654 
In a textbook I'm reading, a step in an example problem was skipped during integration, and I'm just not quite seeing...

Mar611 11:25 AM
AlephZero

3 
939 
Hi I'm in the process of trying to understand the proof to bessel's equality and inequality and I am stuck, I have got...

Mar611 08:05 AM
dextercioby

1 
2,101 
I'm trying to get a method to determine the time, t, when two sine waves added together peak, an exact solution. For...

Mar511 04:24 PM
Jcouls29

9 
3,472 
Hi All,
This is not a homework question, I am just trying to be come quicker at integrating by parts, when...

Mar411 06:12 PM
jhooper3581

4 
1,253 
Hi people
Can you kindly tell me how to solve P(cotg x)^5 step by step?
I made some calculation but I couldn't...

Mar411 04:01 PM
joao_pimentel

2 
1,645 
Question
Let (S; d) and (T;D) be metric spaces. A function f : X > Y is said to be
uniformly continuous if ( for...

Mar411 01:04 PM
LCKurtz

1 
1,738 
In solving the driven oscillator without damping, I need to solve the integral
{ exp / (w)^2  (w_0)^2 } .dw
...

Mar411 10:45 AM
Master J

2 
1,533 
If (xn) and (yn) are two Cauchy sequences in a metric space (X, d), and we define
d((xn), (yn)) = lim d(xn, yn). Is...

Mar411 12:09 AM
Bachelier

8 
888 
Recently in adv calc we have been dealing with the epsilon delta definition for continuity, and my professor said that...

Mar311 08:32 PM
Skrew

2 
731 
/*find abs value of an array*/
int absv(double *a, int n)
{
int i;
for(i=0;i<n;i++)
{if (a<0)
a=a;
}

Mar311 08:21 PM
nenyan

4 
1,559 
A general question I came up with and it might be trivial, but I'm not entirely sure what the answer is.
Does there...

Mar311 06:09 PM
Hyperbolful

3 
1,450 