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

Feb2313 09:23 AM
micromass

1 
38,810 
In a righthanded cartesian coordinate system the divergence and curl operators are respectively:
\nabla \cdot A=...

Oct1911 04:13 AM
Aidyan

0 
799 
I'm confused by this problem. Is the answer 1 or 0 OR 1/2? If the series is upto n, then the answer is 1 if the number...

Oct1911 03:24 AM
pwsnafu

28 
3,624 
Hey all..so Ill go ahead and say that I recently discovered passion for math..I didnt really learn too much in...

Oct1911 03:00 AM
JJacquelin

1 
732 
Hey guys,
I saw these just showed up on arXiv, published by some unknown who claims to have invented his own number...

Oct1911 02:17 AM
chiro

5 
2,276 
http://imageshack.us/photo/myimages/809/equationu.png/
I'm not understand this simple step.
Btw, this...

Oct1911 12:21 AM
Char. Limit

1 
601 
How do you go about solving implicit equations for y in terms of x that look like these?
y2 + yx = 1
and
y3 +...

Oct1811 10:05 PM
Mentallic

3 
1,270 
I have a hexadecimal number: 0x83
I need to determine 0x83^11 mod 15. Where the 11 and 15 are decimal.
I...

Oct1811 04:59 PM
obafgkmrns

1 
1,266 
Hi,
First of all, sorry if this kind of thread has been posted before. If so, then a reference to that thread would...

Oct1811 12:33 PM
ufarad

7 
1,446 
f(x)=xabs(x) show f '(0) exists

Oct1811 09:00 AM
daveb

1 
874 
in a non mathematical sense?
My maths isn't very good which is why I need some simple explanation of what they...

Oct1811 08:25 AM
paulfr

6 
3,025 
I have a formula to be solved for x that is y=x^3x
I have a solution given x=((27y^24)^.5/23^2/3+y/2)^1/3 +...

Oct1711 09:19 PM
Matt Benesi

2 
950 
This theorem I understand but I was only stuck in a simple implication in the proof
Theorem : If f is continuous...

Oct1711 04:51 PM
mahmoud2011

13 
1,593 
/cos^2β is maximum then what is the relation between θ and β.please explain the procedure.

Oct1711 11:34 AM
anigeo

0 
849 
Hi,
In school (I think) I recall there being a test for an equation which determined whether or not it was a valid...

Oct1711 05:50 AM
Chrisistaken

4 
1,324 
this comes strait from a text book:
http://higheredbcs.wiley.com/legacy/college/nise/0471794759/appendices/app_i.pdf...

Oct1711 05:37 AM
AlephZero

1 
890 
Hi all,
I am confused with this formula from the cross entropy method
...

Oct1711 04:51 AM
TheMarksman

0 
719 
Heres two problems from an A Level related paper: prove that if pq is irrational then atleast one of p or q is...

Oct1711 04:20 AM
logics

4 
2,860 
Hey,
I'm trying to prove a larger theorem; in order to complete my proof I need to use the following lemma (or, if...

Oct1611 09:21 PM
Deveno

14 
1,803 
Where's the motivation for concluding that there are infinitely many unique infinite cardinal numbers?
I understand...

Oct1611 12:41 PM
Number Nine

1 
956 
sin of an angle θ is sinθ=p/h. again sin90=1 which means that p=h.but the hypotenuse is the longest side of a right...

Oct1511 11:03 PM
DaveC426913

1 
1,281 
http://anythinghere.comeze.com/slope.png
The slope is supposed to be 0.16 but that's not what i get. Can someone...

Oct1511 09:16 PM
bangthatdrum

2 
1,019 
So far I've been working elementary math problems where the main focus is on creative ideas. I want to up my game but...

Oct1511 07:15 PM
bangthatdrum

5 
1,308 
Hello,
I'm pondering over this research question.
Let's suppose you've got a bunch of units which can be...

Oct1511 05:36 PM
phinds

3 
774 
Aaaagh. I'm really confused right now. I just started learning MPG a few hours ago so go easy on me. It's hard to...

Oct1511 12:21 PM
Quietus

0 
1,243 
Consider a cyclic quadrilateral ABCD with AD produced to E.
Then \angleEDC = \angleABC (ext\angle=opp int \angle)....

Oct1511 11:57 AM
grzz

0 
1,791 
Hi,
I wolud like to solve the folowing equation:
A*cos(B*t)+sin(B*t)*(Ct)D=0 (t is unknown)
It is urgent....

Oct1511 12:52 AM
paulfr

5 
1,185 
How to prove
(2n)!!=2^nn!
for example
(2)!!=2^11!=2
(4)!!=2^22!=8

Oct1411 04:24 PM
matematikuvol

5 
1,257 
What is the greatest number N of equivalent masses M which can mutually gravitate over time within a radius R?

Oct1411 02:41 PM
Loren Booda

2 
767 
Hi all,
I am new to this forum. I am requesting all, please if you can help me. I want to integrate the Swallowtail...

Oct1311 10:38 PM
zhouyang

6 
1,290 
Is this series divergent and what is its name? If the series is not divergent, what is the constant named? Note that...

Oct1311 06:33 PM
Matt Benesi

2 
872 
Hello,
Can someone tell me if what I am doing is correct. I am trying to solve this equation of 0 = n ( p  p0 )...

Oct1311 06:14 PM
mathman

3 
1,682 
f(x)= lnx ; g(x) = ex
f{g(x)} = ln ex = x; not an issue
g{f(x)}= eln x = ???? (answer for this) f(x) and g(x)...

Oct1311 05:39 PM
paulfr

7 
1,404 
How many minutes do you get for $100 if the cellphone plan charges .20 a minute?
I think it's 500 minutes but I'm...

Oct1311 05:13 PM
Embison

11 
1,326 
How do you compute a circular permutation with repetition?
I need some literature on this, so if you can share any...

Oct1311 04:54 PM
kaleidoscope

0 
1,355 
Hi all,
\sum_{i=1}^n k_i \Pi_{i=1}^n O_i(\mu)
How to interpret this equation.

Oct1311 08:25 AM
TheMarksman

2 
1,376 
I began thinking of this question long ago, but only now, that I am reading A History of Mathematics, 2nd edition,...

Oct1311 02:27 AM
Hootenanny

64 
3,636 
Show that, with an appropriate choice of constant c, the taylor series of
(1+cx)ln(1+x)
has terms which decay...

Oct1211 07:51 PM
phinds

4 
951 
http://img442.imageshack.us/img442/4514/ballsp.jpg
The base case is 2^{K} = n (which turns into log_{2}n = k
So I...

Oct1211 11:22 AM
seansrk

2 
894 
http://en.wikipedia.org/wiki/Squareintegrable_function
According to the tutorial: it says
g*(x) is the complex...

Oct1211 09:55 AM
HallsofIvy

2 
900 
Hi all,
I have this kind of optimization problem:
Variable to control: A=A=
objective function to minimize:...

Oct1211 07:51 AM
serbring

1 
1,023 