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

Feb2313 09:23 AM
micromass

1 
39,245 
is it true that
z  w \leq z + w ??
if so what is the proof?
here is my workin so far.. please...

Oct707 08:01 PM
leon1127

1 
839 
let ABDE and BCGH be squares lying outside the traingle ABC. The centres of these sqaures are P & Q respecitvely, and...

Oct707 07:33 PM
Chris Hillman

1 
1,290 
How can you prove sets
1
how can u prove the following sets are are open,
a. the left half place {z: Re z...

Oct707 06:51 PM
heyo12

2 
2,088 
Can someone help me with this problem????
The joint probability mass function of X and Y, p(i,j)=P{X=i,Y=j}, is...

Oct707 01:04 PM
prodicalboxer

0 
10,201 
hi
the question is :
find the force needed to keep a helicopter hovering in place if the helicopter weighs 800...

Oct707 11:13 AM
uae

0 
1,014 
My favorite mindbending phenomenon to mention to future high school teachers is the socalled EulerCramer paradox. ...

Oct707 06:19 AM
chaoseverlasting

12 
2,746 
tan(30)=(sin(theta))/(1+cos(theta))
The only way I can solve this is by using the graph on the calculator. There...

Oct707 05:59 AM
Hurkyl

17 
2,531 
I came across this amusing treasure hunt problem in a book on the history of complex numbers. The author got it from...

Oct607 10:23 PM
robert Ihnot

3 
4,333 
you receive a 50% franked dividend of $500. corporate tax rate is 30%.
what is your assessable income in relation...

Oct607 12:04 PM
HallsofIvy

1 
1,324 
I was asked to find the derivative of y=sqrtx at x=1
I need to use the formula
lim x > a = f(x)  f(a) /...

Oct607 11:05 AM
arildno

1 
2,351 
In 2006, the mathematically rigorous proof of the Poincaré conjecture was completely excepted. The Poincaré conjecture...

Oct607 09:33 AM
mathwonk

2 
1,297 
Is the sequence defined as the denumeration of Q the only such sequence?

Oct507 11:15 PM
mathwonk

5 
2,716 
I would like to selfstudy Probability and Statistics, but I'm not sure what textbook to buy? I'm currently in...

Oct507 04:49 PM
rocomath

0 
4,760 
I'm a Cal2/Physics 1 Undergrad and, largely due to Asimov and the show Numbers, have an interest in Applied...

Oct507 04:17 PM
2ltben

0 
1,405 
Hello everyone
A question in complex numbers
If inflicted
P = q par
There is a point of equality:...

Oct507 02:27 PM
m_s_a

0 
920 
Let \tan_1x=\tan x and \tan_{k+1}x=\tan\tan_kx.
It's fairly clear that the sequence (\lfloor\tan_n1\rfloor) =...

Oct507 02:13 PM
CRGreathouse

0 
1,135 
I say urgent because of the horribly small lecture I received on this section, a whole 3 minutes or so of examples....

Oct507 05:19 AM
Uther

10 
2,374 
Most of the time, when someone complains maths is dry or boring is it because they are not getting it (rule out the...

Oct407 03:22 PM
mathlove3.14159

39 
4,726 
I feel aggravatingly close to the answer to this one, but have caved in.
Using ~ for "is equivalent to"
A given...

Oct407 01:10 PM
HallsofIvy

3 
4,877 
We define: <u,v>=u2v2+u3v3
For vectors u=(u1,u2,u3) and v=(v1,v2,v3) in R3.
Explain the reasons why this is not...

Oct407 06:47 AM
jacko_20

2 
1,507 
Hi
I'm working on a Mac application to visually illustrate the doppler effect and managed to confuse myself with...

Oct407 03:10 AM
ktoz

0 
1,083 
Here is the problem:
You have a sandwich shop. You can choose one of 6 different breads, 1 of four different...

Oct307 11:51 PM
Hurkyl

2 
8,929 
Wikipedia shows this graph for the arccotangent function, which I can also find in a few other web pages like this...

Oct307 10:24 PM
out of whack

2 
5,362 
hey guys,
I got this question that I am a bit stuck on. I have done question two and got the fourier series, but...

Oct307 12:06 PM
Eighty

3 
1,641 
Hey, I think I am pretty sussed out on all of this, but it's best to be 100% sure right?
Inverse: Does the opposite...

Oct207 04:15 PM
AbedeuS

2 
1,476 
I just dont get how this branch of mathematics can exist. How is it that we can use "i" or √1, its not even real!!!...

Oct207 02:35 PM
matteo16

5 
1,522 
Hi, I'm looking to receive a little help with this area of math. (My math skills are very poor, (currently repeating...

Oct207 01:02 PM
arildno

9 
2,324 
I am new to Derive 6 and Laplace Transforms. Is it possible to solve the closed loop gain A/B of the attached loop...

Oct207 10:59 AM
uart

3 
5,375 
can some one show me how to write
5+10+17+26 in sigma notation

Oct207 09:21 AM
HallsofIvy

11 
1,395 
So I have an equilateral triangle an I want to divide it in 4 parts, all having the same area. This can be done in a...

Oct207 02:28 AM
jonas.hall

2 
3,184 
Im doing a short technical paper on matrices for my college magazine, and Im looking for some problem I can model....

Oct107 01:00 PM
chaoseverlasting

10 
3,497 
I put this question in the 'Calculus' forum but didn't really get a response. Maybe it's a silly question but I...

Sep3007 06:37 PM
DeadWolfe

2 
1,814 
http://www.sciencemag.org/cgi/content/summary/317/5846/1851
==quote from Science==
EDUCATION RESEARCH:
U.S. Says No...

Sep3007 04:41 PM
Quantumduck

13 
3,570 
Quick Summary: I'm in a class were we analyze code / find big theta / Oh / etc (Algorithm Design and Analysis). It's...

Sep3007 03:08 PM
Servo888

0 
1,780 
apologie me if this question isn't corret or is simple for you
do solutions of an equation as quaternions or as...

Sep3007 01:29 PM
matt grime

1 
1,340 
Hello,
I am a High school algebra teacher looking for a modeling tool for algebra tiles. I have four sources of...

Sep3007 09:52 AM
Quantumduck

28 
3,423 
I'm wondering if someone can furnish me with either an example of a topological space that is countable (cardinality)...

Sep3007 12:22 AM
morphism

3 
5,454 
Find the equation of a ellipse given the foci. (1,0) (3,4)

Sep2907 05:44 PM
mathman

2 
1,340 
Hey there everyone. I was looking at an epsilondelta proof I did and realized that I wasn't exactly sure why one of...

Sep2907 03:56 PM
HallsofIvy

4 
2,245 
I am teaching euclidean geometry this fall and realized i dont know it that well. there are some famous modern...

Sep2907 11:46 AM
mathwonk

29 
5,469 