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

Feb2313 09:24 AM
micromass

1 
45,364 
First I had learned this definition of a "measurable function" (Apostol):
"Let I be an interval. A function f: I...

Feb2006 02:03 PM
Castilla

2 
3,982 
Just a quicky:
I've been trying to derive some expressions for derivatives of a complex functions of a complex...

Feb2006 12:33 PM
Diophantus

0 
948 
A few days ago, my teacher and I had a disagreement about end model behaviors. There was a question on the test...

Feb1906 04:54 PM
arildno

7 
1,438 
Physicists do it all the time: playing around with those symbols like \frac{dx}{dt}. They just treat them like...

Feb1906 11:31 AM
Hurkyl

7 
1,933 
Since things are a bit quiet here, I thought I would throw out a puzzle I came up with several years ago, after...

Feb1706 03:09 PM
NateTG

7 
1,903 
My guess is 'yes'. :uhh:
Daniel.

Feb1706 06:39 AM
HallsofIvy

3 
1,776 
Hi everybody,
I have one question about integrals. I know the definition of an indefinite or definite integral but...

Feb1706 12:53 AM
arildno

9 
2,227 
I have a question regarding this.
I wish I were home right now so I can give the exact words.
Anyways, the book...

Feb1606 12:02 PM
HallsofIvy

7 
1,832 
I didn't know where to put this exactly...
I've been stuck somewhere in calculus..... I mean...
I've been trying to...

Feb1006 09:41 AM
Jeff Ford

9 
1,321 
Good day. I am studying Lebesgue integration in Apostol’s Mathematical Analysis. I have learned already (I believe so)...

Feb606 09:06 AM
Castilla

2 
2,121 
Hi there,
Does anyone know of a proof of why, in partial DEs, one can assume the existence of variable seperable...

Feb306 12:15 PM
arildno

2 
2,290 
Hello,
I have two questions to ask regarding uniform convergence for sequences of functions.
So I know that if a...

Jan3106 03:44 AM
benorin

4 
2,796 
Hello everybody.
I haven't found anywhere the rigurous relation between the Continuos Fourier Transform (CFT) of a...

Jan3106 01:59 AM
Fernsanz

0 
3,133 
In the Fundamental Theorem of Calculus, it is stated that
lim max deltax_k > 0 sigma f(x_k*)*deltax_k = L,
...

Jan2806 04:05 AM
Galileo

7 
2,596 
e^{x^2}\cos \left( e^{x^2} \right)
Mathematica doesn't have an algorithm for it, does a closed form exist for the...

Jan2706 03:19 AM
cogito²

1 
1,436 
Hi,
Find the result of this integration::
\int_0^\infty \frac { e^ {3x}  e^ {4x} }{x} dx
The members who know...

Jan2506 11:12 AM
shmoe

8 
1,317 
In physics, we often use the assumption that if the integral:
\int_D f(\vec x) d \vec x =0
and this holds for...

Jan2406 01:20 PM
StatusX

1 
2,124 
Can anyone help me integrating the folowwing integrand from zero to infinity:
x*ln^2(ax)*exp(bx^2+cx)
where a,b and...

Jan2406 08:10 AM
ari_a

3 
1,449 
Question that I came across and that has stumped me for about a week hehe.
Let p(z)=z^n +i z^{n1}  10
if...

Jan2406 03:30 AM
Muzza

1 
7,139 
If I had a sinusoid, how would I find the average value of it over a given interval. Say pi/5 to pi/5 for instance....

Jan2306 06:18 PM
mathman

3 
15,582 
Is this identity true?
Identity:
\frac{d}{dx} x^n = \lim_{h \rightarrow 0} \frac{(x + h)^n  x^n}{h} = nx^{n1}

Jan2306 12:54 PM
benorin

51 
5,160 
I hope the following webpage on new roots solving algorithms based on the Arithmonic mean (a particularcase of the...

Jan2306 10:18 AM
arithmetic

0 
1,216 
I did some number crunching and found the following:
Given n equations in n unknowns:
a*f(x) + b*g(y) = c...

Jan1906 04:49 PM
Edwin

9 
6,166 
i need help in proving this essential ineuality which i don't know how to prove (quite trivial isn't it):...

Jan1806 10:37 PM
leon1127

11 
1,468 
Happy new year for you all,
This is very nice place, So girls and boys, let me give you something to play with:...

Jan1706 07:07 PM
enigma

37 
4,182 
f_n(x)= x^n/1 + x^n
does this series converge on the interval
Say if x = 1 then the series is < some epslon ,...

Jan1706 01:16 PM
maverick6664

4 
1,305 
Hi,
I ran into a situation I haven't experienced before where the integral of the derivative doesn't get me the...

Jan1606 12:33 PM
dc20

6 
1,219 
I have made some observations regarding the Precise Limit Definition.
For any given polynomial:
ax^n
The...

Jan1506 11:03 PM
benorin

10 
2,259 
This problem is baffling myself and several of my friends in the infamous Physics 152 class... so I give it to you...

Jan1506 11:09 AM
matt grime

5 
1,593 
How do you find the limit to:
Lim
x>0+ sqrtx/(1cosx)
I use the L'Hopital rule and i get
lim
x>0+ ...

Jan1406 03:35 PM
mathwonk

12 
1,696 
Hello...I need help and I know this is a very simple problem...I don't know why I'm getting stuck( Maybe because it's...

Jan1406 12:45 PM
matt grime

1 
1,033 
(A, B) is an interval in the real line. If I take the middle point (BA)/2, and then take the middle point of each of...

Jan1306 09:30 AM
Castilla

7 
1,438 
I would like to determine necessary and sufficient conditions for equality to hold in Minkowski's Inequality in...

Jan1206 09:17 AM
fourier jr

2 
7,920 
I am thinking about purchasing some math software so I can get a better understanding of the math I am learning. I...

Jan1106 09:52 AM
shmoe

19 
3,267 
Given a realvalued function f:X \mapsto \mathbb{R} where X is a subset of \mathbb{R}^n. Consider a closed extended...

Jan1106 01:12 AM
kaosAD

0 
1,050 
Find a & b for the following transformation
1/(z+a) = (a/z) +
I am kind of lost as to where to start on this...

Jan1006 11:16 PM
Tide

1 
1,912 
I'm doing a review in calc I to prepare for calc II. I'm now applications of derivatives (optimization). Okay so when...

Jan1006 04:24 AM
Demian^^

4 
1,751 
My calculus book describes the following example:
Equation:
\lim_{x \rightarrow 0} \sin \frac{\pi}{x} = \text{does...

Jan906 06:13 PM
Data

15 
2,222 
It should be relatively easy, but I can't seem to figure out how to begin.. if anyone could help me out, I would be...

Jan806 04:00 PM
Demian^^

0 
929 
Hi. I have this exam in vector calculus tomorrow, but i'm having trouble sorting the following formula out. Could...

Jan806 02:55 PM
Tide

3 
1,871 