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

Feb2313 09:23 AM
micromass

1 
36,806 
Hello,
Trying to solve an equation about sonar range equation and can not end up with a feasible solution.
The...

Dec2407 03:34 PM
zibifnik

2 
4,882 
This video has started bouncing around my math department and I thought I would share. It's a math love song by these...

May405 04:45 PM
houserichichi

4 
2,004 
Hi all.
I look up and down this thread and see that the threads are rather intellectual but I have a question that...

Apr1005 05:01 PM
hypermorphism

24 
2,729 
How do professional scientists make sophisticated calculations, e.g the Einstein's tensor equations in general...

Apr2305 05:38 PM
Starship

4 
1,130 
I found this quite interesting. Enjoy.
http://www.physics.harvard.edu/~plu/publications/Science_315_1106_2007.pdf

Feb2707 04:51 AM
Doodle Bob

6 
1,448 
Sorry, wrong title...

Nov1110 08:57 PM
k_squared

0 
432 
hello people. Im sorry about this post becuse i have been reading some of the posts here and they are really high lvl...

Oct3007 06:09 PM
symbolipoint

3 
1,260 
A friend of mine gave me this problem to solve because he couldn't and I've been stuck in it for some time and also...

Aug2810 12:22 AM
Office_Shredder

3 
1,030 
Is anyone able to provide a resource for the proper formulae to use in determining blade dimensions for an aperture...

Mar214 10:28 AM
Stephen Tashi

1 
362 
im trying to proove that d_abc=(a^2+b^2+c^2)^0.5
that the space diagonal of a cuboid equals the square root of the...

Nov2103 11:15 AM
jcsd

2 
7,426 
Here's a problem which I encountered a while ago:
"There is an alien on the surface of a spherical planet. The...

Oct1307 01:48 AM
magic_castle32

7 
1,748 
I have the following problems :
1) out of 2 dimensional views (snapshot or photos), from an origin, how to compute...

Nov2505 11:11 AM
kleinwolf

0 
1,247 
I'm trying to prove the following theorem using graph theory:
I first tried to come up with an example:
Graph...

May1405 11:16 PM
neurocomp2003

8 
936 
hi,
what's the spanning tree from the graph shown? it was on a test and i'm curious as to if i'm right or not.
...

Jul2605 09:06 AM
barneygumble742

2 
1,201 
Hi all:
I need to solve a sparse linear system, I found the iterative methods library which probably fit my...

May2708 09:24 AM
Asuralm

0 
2,653 
A periodic function is one that ##f(\theta) = f(\theta + nT)##, by definition. However, the argument ##\theta## can be...

Apr2014 08:33 PM
gopher_p

3 
366 
what do spatial dimensions higher than the third dimension mean? what do they represent. any object can be described...

Jul2211 02:21 PM
SteveL27

13 
2,095 
Suppose a generalization of planar graph is considered into 3D space :
a graph is said "spatial" if it can be...

Oct1613 12:06 PM
jk22

12 
3,733 
Which subjects should I study to speak mathematics in a superior form? Also, which books do you recommend?

Sep2406 09:37 AM
CRGreathouse

7 
1,532 
This is the equation for the Rank Correlation Coefficient:
1 \frac {6 \sum d^2} {n(n^21)}
can anyone explain...

Feb1405 03:15 PM
ohwilleke

1 
3,239 
Find all positive integers n (n will be called special)
such that if n divides a three digit number say ABC where A =...

Aug2508 09:08 PM
DejMar

12 
6,692 
So, to start off... My name is Neal, I'm 32, and a pharmacist. I'm an only child and my mother means the world to me,...

Aug2908 02:28 PM
kmikias

19 
3,029 
For determination of the distance from a certain point, a function should be used. Namely, the input values 'x' are...

Nov1010 04:56 AM
onako

8 
2,661 
I've been clawing at my mind for a while regarding this, I pray somebody can help me.
I was implementing a method...

Aug1110 10:04 AM
dodo21

6 
1,906 
Suppose I have the following equation:
P=a*n
Where a is a value between 0 and 1.
n is the day of the week. (this is...

Jun1111 05:25 PM
clydas

2 
902 
hi,
Could someone point me to some good material that relates to problems of (computational) spectral analysis? I...

Mar404 11:21 AM
Njorl

2 
1,621 
Hi
In the spectral method, the fourier series is differentiated term by term. How do we know this series converges...

Jun1910 11:00 PM
jbunniii

1 
770 
I tried to obtain the spectrum of a discrete signal and I had some problems...
If I compute on a PC the discrete...

Aug1003 01:54 AM
chroot

2 
2,182 
Hello! I,m wondering if someone can help me out with a speeding ticket problem!! Here,s the scenario (or the question,...

Nov2311 09:52 AM
zgozvrm

9 
1,633 
I've found this flash speed math trainer.
http://www.jimmyr.com/blog/Speed_Math_Trainer_Program_126_2006.php
I was...

Jul1007 10:48 AM
Clodomir

0 
2,687 
We have vehicles A and B
A road with three lanes, two left only, going onto the highway, and the far right lane for...

May213 03:12 AM
mocha98

2 
566 
In papers, when should I spell a number (sixteen) and when I should write it using numerals (16)?

Jun109 01:31 AM
maze

5 
1,484 
Hi,
Recently i tried (and failed) to calculate the intersection volume of a sphere and a cylinder.
I found this...

Dec809 04:34 PM
ojs

2 
7,548 
How do you prove that for a given volume, sphere has the minimum surface area?

Jul2413 03:00 PM
jackmell

12 
1,452 
Can someone give a proof of the statement: “For fix volume a 3D objects that has minimal surface area is the sphere” ?

Feb1713 09:13 PM
micromass

3 
700 
How many cubes of side 1 centimeter can fit into a sphere of diameter 3 centimeters?

May2710 06:56 PM
DaveC426913

22 
2,057 
How many ndimensional unit vectors from \mathbb{C}^n can you pack in a set such that for any two vectors, \left<a,...

Jun1208 07:14 PM
maze

7 
2,566 
r^2 = x^2 + y^2 + z^2
I would like to know what would be the equations be for:
A sphere of radius = r in...

Nov508 04:44 AM
HallsofIvy

3 
5,134 
Are spherical and cylindrical coordinate systems only a physical tool or is there some mathematical motivation behind...

Dec1011 01:35 PM
intwo

0 
806 
Hello,
What I really want to do is deal with spherical "crescents" and incomplete annuli and see how well they are...

Jul2809 06:37 PM
flatmaster

1 
2,770 