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Common math questions, quality answers.
Jul24-14 10:02 AM Greg Bernhardt 
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Test your skills. Math challenges will be posted at least once a week. Suggestions for problems are welcomed.
Aug5-14 02:05 PM fredoniahead 
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All math courses. PDFs, tutorials and web links.
Aug13-14 05:16 PM seouldavid 
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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
1 38,819
Greetings, Given three points P1 P2 P3 on a circle in x,y,z coordinates, I am trying to figure out how to get the...
Apr15-10 10:51 AM
HallsofIvy
3 1,037
Hi all I have a log-log graph as attached and would like to find the equations of the lines plotted on it. If I...
Sep9-10 03:43 PM
a3sportback54
0 1,409
I was wondering if anyone had a good method for creating an equation from a set of coordinates. Let's say I have a...
Feb7-11 10:04 AM
jjj888
2 1,703
Not quite understanding what creates a plane, and what creates a line in 3D. Are vectors points in the plane with a...
Feb4-12 08:21 AM
lonewolf219
3 2,026
Dear All, Currently I'm working out a formula for Destroyers in the online game BattleGround Europe to be able to...
Aug23-06 03:53 PM
Adder_Noir
15 1,490
My maths skills are so rusty that I can't figure out how I simplify these equations so that I get a formula for x and...
Mar20-13 06:40 PM
AlephZero
4 629
If we are asked to place 3 points on the surface of a sphere so that they are equidistant, it's easy to visualize that...
Apr3-14 09:54 PM
DrewD
10 604
Hi all, How would you determine the angle i in the following equilateral triangle. ...
Jun3-13 04:00 PM
EvanT
2 684
Suppose I have a directed graph in Rn. Where the graph is a hypercube, (a square in R2, a cube in R3 etc). Suppose...
Apr5-03 05:00 AM
Pauly Man
4 7,327
Question, List the members of the equivalance relation on {1,2,3,4,5} by the given partition. Identify the equivalance...
Apr15-04 08:08 AM
ptex
7 1,238
Is there a way to figure out the number of equivalence classes for all graphs of order n, size k?
Jun14-09 11:22 AM
CRGreathouse
1 1,411
Hi, When I was just walking through the hallway of my department I found an exercise sheet asking the student to...
Nov10-08 10:46 AM
HallsofIvy
3 1,980
Hey I can't see how x~x+1 is an equivalence relation on the real numbers? I don't understand what the relation...
Nov13-09 08:57 AM
andlook
6 1,148
Sorry for such a basic question, but I don't know what they mean by the O, o, and ~ in a book I am reading. I'll write...
Dec14-10 03:51 PM
mathman
1 610
Hi, Here is my question. I need to prove the following an equivalence relation. Let A = {1,2,3,4,5} X {1.2,3,4,5}...
Jun5-07 02:10 AM
Dream
8 5,125
Hi, I'm reading a book on sets and it mentions a set B = {1,2,3,4} and it says that R3 = {(x, y) : x ∈ B ∧y ∈...
Apr28-14 08:56 AM
kingstar
3 454
Hello everyone, is the following an equivalent definition of the supremum of a set M, M subset of R? y=sup{M} if...
Feb4-12 12:21 PM
micromass
5 1,150
Ok, What do you do when two equations that should yield the same answer dont? For example when finding the area of a...
Sep4-04 10:58 AM
mewmew
8 5,173
Is there a way to express ##{n\choose k}{n\choose r}## in another form without n as the "top" of the binomial...
Jul17-13 07:05 PM
LCKurtz
1 541
I've been having a little "problem" with the concept of equivalent mathematical statements. As far as I can tell,...
Jul10-04 01:15 PM
Galileo
3 6,622
I'm trying to find the papers where a rather dramatic result on billiard systems was proved: for 'typical'...
Nov21-08 05:47 PM
Doodle Bob
1 979
*Note: I think questions 2-4 are erroneous? 1) There does NOT exist any x \in \mathbb{R} such that x \in \left(...
Sep10-05 10:40 AM
hypermorphism
6 1,827
given that a=(6.0+/-0.1) and b=(17.5+/-0.3) what is 2a^2 + b^2 i'm having so much trouble with this i think we...
Sep20-07 12:14 PM
Diffy
6 3,005
I think this is probably the right place to put it, didn't really fit anywhere else. I've got the joyless task of...
Apr20-12 01:21 PM
Fluorescent
0 1,154
Suppose I have some measures of certain physical magnitude "I" between the range x=x1 and x=x2. I have for each x...
Oct22-03 01:55 PM
HallsofIvy
1 2,581
Hello yall im new here. Im a first year student in engineering. I'm writing up a lab now and im supposed to be...
Sep12-10 12:55 PM
OpticalSuit
2 1,170
Hello, I have a question about error detection. Senario: One person can see two coins. Each coin could be...
Oct7-03 02:28 PM
wubie
1 1,551
Hello! don t understant the question. Calculate the error function for f(x)=tan(x), for linear, quadratic and...
Nov2-11 09:58 AM
jackmell
5 1,374
I would like to know how the following integral for the error function gets derived (found by following the link): ...
Nov2-11 04:04 AM
JJacquelin
7 1,685
For a matrix , Is there anyway to calculate the Error function of matrix or Erf ? Any possible solution to...
Mar20-11 02:18 PM
Stephen Tashi
5 1,350
On project Eureka the following problem was posted: You and a friend like running, but your friend is much faster...
May17-12 06:28 PM
Bagbo
3 894
I have an equation that I've been trying to solve. I manipulated it until I had a=f(d) and then did by best to put it...
Jul28-12 08:06 PM
haruspex
4 1,002
Hi i found this "error" in my text book in series. ...
Mar11-07 06:56 AM
matt grime
12 1,865
A highway and a train track run parallel to each other. At 5:00 a train crosses a river. Fifteen minutes later, a car,...
Jan19-08 09:07 PM
Holocene
4 1,687
could find input index file that's one error that shows up I have no idea how to fix it.
Apr9-07 09:36 AM
Hootenanny
3 2,864
http://img.photobucket.com/albums/v224/TurbineSpeed/Picture402884.jpg Isn't it true that the "y" does NOT belong...
Nov22-07 11:33 PM
stewartcs
3 1,579
Hi, For an experiment I have a value for the error in time t (s) to be +-0.13s but I'm having difficulty getting...
Apr5-11 01:10 AM
kwah
2 2,531
In chapter 5 of Young/Freedman's University Physics, 13th ed., Eq. 5.10 is given as: ##v_{y} = v_{t}(1 -...
Aug10-12 04:30 PM
SiennaTheGr8
8 1,174
Always the easy things we forget... I know how errors propogate through multiplication or division when every term...
Sep28-04 06:46 AM
HallsofIvy
1 2,486
Recently I came across an example for working out error propagation, and I'm having trouble following the steps: A...
Jan20-10 10:57 AM
elibj123
3 1,894

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