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

Feb2313 09:24 AM
micromass

1 
45,073 
The principal value of 1/x is a generalized function/distribution.
What is the derivative of it?
Is it the...

Jun1107 06:48 PM
DeadWolfe

1 
3,561 
Hi all
A basic question here:
I am deriving the equation for the expectation of a lognormal variable. This...

Jun1607 11:58 AM
arildno

1 
1,573 
What is dx mean in intagral?

Jun1907 09:29 AM
malawi_glenn

1 
910 
:rolleyes::rolleyes:

Jun2307 03:45 AM
siddharth

1 
1,137 
Let be y=f(x) a differentiable function, my question is if we can define a basis on R^3 at every point using \partial...

Jun2407 06:04 AM
matt grime

1 
1,347 
I have a problem with this simple (?) derivation
u(f(t),t) = \frac{\partial }{\partial f(t)}
\int_0^T \...

Jun2907 05:46 AM
Klaus_Hoffmann

1 
1,635 
what is the difference between a linear approximation and a tangent line?
my understanding is that the linear...

Jul207 04:25 PM
mathman

1 
1,359 
I'm going to be working in 4D, and I assume my metric is symmetric. So what I am interested in is an integral of the...

Jul407 08:21 AM
matt grime

1 
1,089 
Hi, I was wondering if I could get an answer to a question that has been bothering me all day today.
Ok, so I got...

Jul907 10:25 PM
Gib Z

1 
1,389 
Is it possible to calculate the derivative of a function of the form \sum_{i=1}^n f(i) with respect to n.
That...

Jul1107 09:41 PM
lurflurf

1 
2,042 
If for a function space , we can define the scalar product of any given 2 functions as
\int_{a}^{b}dx f^{*}(x)g(x)...

Jul1407 08:26 PM
HallsofIvy

1 
1,581 
This is not a homework but it is a question in my mind.please guide me.
Let X and Y be topological spaces,let f : X...

Jul1707 10:28 AM
morphism

1 
1,075 
hi, my problem is to evaluate the nth difference to be able to approximate the nth derivative of a function f(x) at...

Jul1807 09:06 PM
lurflurf

1 
1,215 
Hi,
I'm trying to draw a Cardinal Spline and understand them  however I can't get my head around the formula.
...

Jul3107 03:48 PM
hotvette

1 
4,966 
given a Polynomial or a trigonometric Polynomial
K(z)= \sum_{n=0}^{N}a_{n}x^{n} and
H(x)=...

Jul2307 04:07 PM
mathman

1 
1,166 
The question is can we obtain the 'Borel sum' of an integral of f(x) from 0 to infinity as the Laplace transform of
...

Jul2307 01:27 PM
Klaus_Hoffmann

1 
1,206 
I CAN'T SEEM TO GET THE ANSWER THAT IS CONSISTENT WITH MY UNDERSTANDING OF THE USE OF DOT AND CROSS PRODUCTS AND THE...

Jul3107 07:06 AM
fopc

1 
22,451 
A function f(t) can be represented by the expansion
f(t) = \frac{1}{2}A_{0} + A_{1}cos(\omega t) + A_{2}cos(2...

Aug107 04:26 PM
mathman

1 
2,024 
So if a function
f:\to\mathbb{R}
is differentiable, then then for each x\in there exists \xi_x \in so that...

Aug407 08:30 AM
MathematicalPhysicist

1 
1,362 
Let f be a differentiable complex valued function on R. If f is square integrable, then it is not the case that f(x)...

Aug407 09:33 PM
mathwonk

1 
2,583 
I am comparing theorem 10.6(c) and 10.14(a) in Apostol's Mathematical Analysis.
My question is this:
Are...

Aug1007 04:59 PM
travis0868

1 
2,109 
Hey
Im in the middle of modelling a logistic model off of population data but I am having a little bit of trouble....

Aug1307 02:42 PM
HallsofIvy

1 
4,682 
hi everybody
In this fall i am taking calculus III and planning to do contract honor with my professor.
as a part...

Aug1307 02:14 PM
eminent_youtom

1 
2,688 
How is it connected to more traditional anlysis. I view analysis as epsilon delta stuff. But topics in linear anlaysis...

Aug1707 04:39 AM
HallsofIvy

1 
3,632 
if m(.) is a nonatomic measure on the Borel sigmaalgebra B(I).
I is some fixed closed finite interval in R.
How...

Aug2007 12:25 PM
EnumaElish

1 
1,426 
Hello everyone, I have taken up on reading a mathematical statistics book and have gotten stuck on the...

Sep107 03:55 PM
ZioX

1 
17,919 
A continuous random variable X has the density function
f(x)=x for 0<x<1
2x for 1 _<x<2
0 elsewhere.
a....

Sep307 01:31 PM
HallsofIvy

1 
1,396 
Hello,
I have an integral
F(x) = \int\limits_a^x f(x) d(g(x))
and g(x) may and may not...

Sep407 11:21 AM
HallsofIvy

1 
2,955 
What does an equal sign with a straight line down the middle of it mean?

Sep507 04:23 PM
chroot

1 
8,515 
I have an upcoming exam, and I'm having trouble grasping some concepts. The things that are currently perplexing me...

Sep1507 06:38 PM
bob1182006

1 
7,810 
I'm suppose to find the limit as x goes to infinity of / .
L'Hopital's Rule does not work on here (it said so even...

Sep1707 09:03 PM
niyati

1 
2,739 
Hi, my teacher gave us this problem, and he couldn't figure out why
method was incorrect and why I got the answer I...

Sep1907 06:18 AM
HallsofIvy

1 
1,653 
Find the point in the plane 3x+2y+z=1 that is the closest to the origin by minimising squared distance. (I hope I...

Sep2107 07:00 PM
mathman

1 
5,684 
I am studying the abstract theory of measure and I was wondering how the Lebesgue case for real functions of a real...

Sep2607 05:30 PM
quasar987

1 
1,182 
Is there any name for the functions for which f(x+y) \leq f(x) + f(y)?

Sep2407 06:45 AM
fopc

1 
1,078 
does anyone know how to do this one?
derivative of 1e^2x????

Sep2407 10:29 PM
hotvette

1 
18,299 
The fundamental theorem of calculus is basically the divergence theorem but dealing with a ball in R^1 instead of a...

Sep2507 05:12 PM
genneth

1 
1,457 
the magnitude and direction of vector can be described without using refrence frame. (true or false) . Please explain...

Sep2507 07:45 PM
AiRAVATA

1 
1,454 
Older textbooks on the Calculus of Variations seem to define the first variation of a functional \Pi as:
\delta...

Sep2707 10:46 AM
EnumaElish

1 
4,303 
What is the answer of \int\frac{1}{cos^2x}d(cos x)?

Sep2707 03:09 PM
genneth

1 
796 