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

Feb2313 09:24 AM
micromass

1 
40,154 
Hi,
I've been doing some additional maths papers and I've seen the use of the substitution u=tan(x/2) in order to...

Jun2210 01:54 PM
arildno

1 
2,272 
I have the following equations:
(See Figure 1)
I tried summing them up in one single general formula, and I got:...

Jun2110 11:27 AM
LucasGB

4 
2,306 
Dear friends,
I generated a time series graph showing some modeled versus measured data (precipitation data)...The...

Jun2110 10:59 AM
ramze

0 
930 
I am unsure as to how factorials should be expanded.
I have \sum\stackrel{1}{(2n!)} (if what was just typed did...

Jun2110 09:15 AM
HallsofIvy

6 
1,255 
Hello all.
This is not homework, i stumbled upon it looking for information for my physics.. I have some background...

Jun2010 11:20 PM
Mark44

7 
873 
Hi,
I don't understand why mathematicians would need to define the mathematical concepts of diffferentiabilty and...

Jun2010 12:04 PM
AlbertEinstein

15 
4,145 
Hi all,
How do I prove that the set of all Mobius Maps form a simple group, that is they have no nontrivial...

Jun2010 11:09 AM
AlbertEinstein

1 
1,147 
LaneEmden differential equation:
\frac{1}{\xi^2} \frac{d}{d\xi} \left({\xi^2 \frac{d\theta}{d\xi}}\right) +...

Jun2010 09:46 AM
Orion1

0 
1,160 
My text says,
In general, if ε > 0, to ensure that
x²sin(1/x) < ε,
we need only require that
x < ε and...

Jun1910 08:55 PM
xeno_gear

10 
2,030 
Hello, I'm dealing with the proof of the theorem below:
x(t) \in L^1(\mathbb{R}), tx(t) \in L^1(\mathbb{R})...

Jun1910 07:47 PM
eliotsbowe

2 
2,696 
If we integrate a vector field over a surface, \int_S \vec{F} \cdot \vec{dS}, we get the flux through that surface....

Jun1910 02:45 PM
thojrie

5 
1,754 
For a single variable we have
\int_{x_1}^{x_2} f(x) dx = F(x_2)F(x_1)
if f(x) = dF/dx. f(x) is then a total...

Jun1910 01:21 PM
pellman

5 
1,733 
Hi,
I actually have trouble understanding Bolzano's Theorem. Could someone please explain it to me?

Jun1910 12:02 PM
hasan_researc

11 
2,063 
I'm going to be taking a fiveweek Calculus I class this summer. It's going to be intensive, but I'm very good at...

Jun1910 02:40 AM
Quisquis

8 
1,372 
\mbox {Suppose I have: } \sum_{n=1}^\infty (\frac {x} {3})^{2n}
\mbox{Can I define } y= \frac {x} {3}
...

Jun1810 11:37 AM
estro

4 
872 
Hello all,
Given a 3d vector function f(t) that traces out a path in space, how can I find the normal and tangent...

Jun1810 10:47 AM
HallsofIvy

4 
1,905 
http://i49.tinypic.com/30lch2b.jpg
they take members from the marked series
how they make the power to be from n1...

Jun1710 02:13 PM
LCKurtz

2 
702 
What is the difference between forward and backward Fourier transforms? I'm look:
F(k) = \int_{\infty}^{\infty}...

Jun1710 10:29 AM
n.karthick

1 
3,234 
Say you have two functions, F(x,y), and G(x,y), and you want to expand them in finite fourier series. Let their...

Jun1610 06:53 AM
elibj123

2 
2,901 
Hello friends,
I am having some trouble with a particular statement an author made in a book.
Despite being a...

Jun1510 04:40 PM
mathman

1 
1,504 
Hi,
I know from my the t shifting theorem that if I take the laplace transform of a function which is multiplied by...

Jun1510 12:25 PM
Ben Niehoff

1 
2,456 
Hey everyone,
I know, lots of threads and online information about Gaussian integrals. But still, I couldn't find...

Jun1510 11:39 AM
Orbb

7 
1,942 
So I've got my exam of analysis tomorrow, but there's this piece of improper integrals I just don't get... (I'll...

Jun1410 08:24 PM
DrRocket

5 
1,079 
Hi,
I came across a book which looks at a problem like
\lim_{x \to 0}\frac{1}{x}
So you approach from 0, and...

Jun1410 07:30 PM
darkside00

8 
3,276 
The latex code here is doing all sorts of odd things... :( ... anyway,
The convolution algebra is...

Jun1410 07:06 PM
DrRocket

2 
2,037 
i have to describe the construction of the Riemann Integral... in 46 sentences.. and i was wondering.. if this is...

Jun1410 04:02 PM
HallsofIvy

3 
839 
Can you give an example of a function f:X\times Y\to\mathbb{R}, where X,Y\subset\mathbb{R}, such that the integral
...

Jun1410 02:16 PM
Ben Niehoff

7 
874 
My textbook describes how some functions are not well approximated by tangent planes at a particular point. For...

Jun1410 07:54 AM
Shaybay92

4 
1,054 
Having a hard time understanding this example from a book:
The function f(x) = 1/x is locally bounded at each point...

Jun1410 07:16 AM
Office_Shredder

1 
882 
Example 1 in
http://en.wikipedia.org/wiki/Chebyshev_polynomials
to get the Chebyshev expansion coefficient of...

Jun1410 12:41 AM
tghg

0 
725 
Suppose f(x) is differentiable 2 times, can I still use Maclaurin polynomial approximations and write:
...

Jun1410 12:08 AM
estro

12 
1,747 
hello,
Im reading goldblatt's NSA book, and i just finished the first part.
i have what i think are some trivial...

Jun1310 11:52 PM
jem05

4 
975 
I am reading Schutz's "Geometrical methods of mathematical physics". He writes: "A map f:M>N is continuous at x in M...

Jun1310 05:20 PM
Landau

8 
1,074 
Hello, I'm wondering what the reason for repeat linear factors in partial fractions is?
I can't find an explanation...

Jun1310 01:06 PM
Mark44

8 
1,365 
sec(x) = \frac{2}{e^{ix}+e^{ix}}
then i multply bot top and bottom by e^{ix}
so i can do a u...

Jun1310 08:59 AM
Gib Z

7 
1,421 
Hello everyone! I just graduated from high school and now moving on to college. I want to get my bachelors in Computer...

Jun1310 12:39 AM
sponsoredwalk

4 
2,205 
One the things which always bugged me about the definition of the integral is that limit of a Reimann sums consists of...

Jun1210 10:13 PM
pellman

7 
1,485 
Integration is not one of my strong points, so I just wanted to make sure I did it correctly.
I am working with...

Jun1210 04:40 PM
tuoni

0 
1,130 
Hello forumites! I got another question (I have a lots of them, maybe I should change my textbook haha).
Suppose...

Jun1210 06:55 AM
Landau

12 
1,054 
1. Sequences of function and their uniform convergence. (most priority)
2. Series of function and their uniform...

Jun1210 12:32 AM
estro

2 
1,113 