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

Feb2313 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...

Apr1510 10:51 AM
HallsofIvy

3 
1,037 
Hi all
I have a loglog graph as attached and would like to find the equations of the lines plotted on it. If I...

Sep910 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...

Feb711 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...

Feb412 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...

Aug2306 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...

Mar2013 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...

Apr314 09:54 PM
DrewD

10 
604 
Hi all,
How would you determine the angle i in the following equilateral triangle.
...

Jun313 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...

Apr503 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...

Apr1504 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?

Jun1409 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...

Nov1008 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...

Nov1309 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...

Dec1410 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}...

Jun507 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 ∈...

Apr2814 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...

Feb412 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...

Sep404 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...

Jul1713 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,...

Jul1004 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'...

Nov2108 05:47 PM
Doodle Bob

1 
979 
*Note: I think questions 24 are erroneous?
1) There does NOT exist any x \in \mathbb{R} such that x \in \left(...

Sep1005 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...

Sep2007 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...

Apr2012 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...

Oct2203 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...

Sep1210 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...

Oct703 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...

Nov211 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):
...

Nov211 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...

Mar2011 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...

May1712 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...

Jul2812 08:06 PM
haruspex

4 
1,002 
Hi i found this "error" in my text book in series.
...

Mar1107 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,...

Jan1908 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.

Apr907 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...

Nov2207 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...

Apr511 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 ...

Aug1012 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...

Sep2804 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...

Jan2010 10:57 AM
elibj123

3 
1,894 