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Common math questions, quality answers.
Jun1-13 07:36 PM Fredrik 
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Test your skills. Math challenges will be posted at least once a week. Suggestions for problems are welcomed. Brought to you by Office_Shredder.
T 04:33 PM pasmith 
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Jan16-12 Greg Bernhardt
Please post any and all homework or other textbook-style problems in one of the Homework & Coursework Questions...
Feb23-13 09:23 AM
micromass
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Hello, Trying to solve an equation about sonar range equation and can not end up with a feasible solution. The...
Dec24-07 03:34 PM
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This video has started bouncing around my math department and I thought I would share. It's a math love song by these...
May4-05 04:45 PM
houserichichi
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Hi all. I look up and down this thread and see that the threads are rather intellectual but I have a question that...
Apr10-05 05:01 PM
hypermorphism
24 2,729
How do professional scientists make sophisticated calculations, e.g the Einstein's tensor equations in general...
Apr23-05 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
Feb27-07 04:51 AM
Doodle Bob
6 1,448
Sorry, wrong title...
Nov11-10 08:57 PM
k_squared
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hello people. Im sorry about this post becuse i have been reading some of the posts here and they are really high lvl...
Oct30-07 06:09 PM
symbolipoint
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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...
Aug28-10 12:22 AM
Office_Shredder
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Is anyone able to provide a resource for the proper formulae to use in determining blade dimensions for an aperture...
Mar2-14 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...
Nov21-03 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...
Oct13-07 01:48 AM
magic_castle32
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I have the following problems : 1) out of 2 dimensional views (snapshot or photos), from an origin, how to compute...
Nov25-05 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...
May14-05 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. ...
Jul26-05 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...
May27-08 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...
Apr20-14 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...
Jul22-11 02:21 PM
SteveL27
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Suppose a generalization of planar graph is considered into 3D space : a graph is said "spatial" if it can be...
Oct16-13 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?
Sep24-06 09:37 AM
CRGreathouse
7 1,532
This is the equation for the Rank Correlation Coefficient: 1- \frac {6 \sum d^2} {n(n^2-1)} can anyone explain...
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ohwilleke
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Find all positive integers n (n will be called special) such that if n divides a three digit number say ABC where A =...
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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,...
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For determination of the distance from a certain point, a function should be used. Namely, the input values 'x' are...
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I've been clawing at my mind for a while regarding this, I pray somebody can help me. I was implementing a method...
Aug11-10 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...
Jun11-11 05:25 PM
clydas
2 902
hi, Could someone point me to some good material that relates to problems of (computational) spectral analysis? I...
Mar4-04 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...
Jun19-10 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...
Aug10-03 01:54 AM
chroot
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Hello! I,m wondering if someone can help me out with a speeding ticket problem!! Here,s the scenario (or the question,...
Nov23-11 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...
Jul10-07 10:48 AM
Clodomir
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We have vehicles A and B A road with three lanes, two left only, going onto the highway, and the far right lane for...
May2-13 03:12 AM
mocha98
2 566
In papers, when should I spell a number (sixteen) and when I should write it using numerals (16)?
Jun1-09 01:31 AM
maze
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Hi, Recently i tried (and failed) to calculate the intersection volume of a sphere and a cylinder. I found this...
Dec8-09 04:34 PM
ojs
2 7,548
How do you prove that for a given volume, sphere has the minimum surface area?
Jul24-13 03:00 PM
jackmell
12 1,452
Can someone give a proof of the statement: “For fix volume a 3-D objects that has minimal surface area is the sphere” ?
Feb17-13 09:13 PM
micromass
3 700
How many cubes of side 1 centimeter can fit into a sphere of diameter 3 centimeters?
May27-10 06:56 PM
DaveC426913
22 2,057
How many n-dimensional unit vectors from \mathbb{C}^n can you pack in a set such that for any two vectors, \left<a,...
Jun12-08 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...
Nov5-08 04:44 AM
HallsofIvy
3 5,134
Are spherical and cylindrical coordinate systems only a physical tool or is there some mathematical motivation behind...
Dec10-11 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...
Jul28-09 06:37 PM
flatmaster
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