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

Feb2313 09:23 AM
micromass

1 
39,202 
Hi,
I'm having some trouble understanding what is meant when the limit of a summation is i<j. Does it mean the...

Nov407 12:37 PM
arildno

1 
3,285 
an increase of $0,15 on a price of 2,50 is an increse by a fraction of 0.15/2.50=0,06
expressed as a...

Nov407 11:36 AM
CompuChip

5 
1,622 
Whenever I read a corollary, even a lemma, I try to prove it myself first before reading the textbook's proof. This...

Nov407 07:07 AM
andytoh

16 
3,415 
Find all triples of primes (p,q,r), that pq+qr+rp and p^3+q^3+r^3−2pqr are divisible by p+q+r.
I really don't know...

Nov407 04:54 AM
davidex

7 
1,724 
What is the relationship between a mobius band and RP^2?

Nov407 03:26 AM
pivoxa15

0 
1,482 
So I need to find the equation of the line passing through (1,∏) (∏₂,∏⁴) sorry, the two would only do sub script not...

Nov407 02:14 AM
cmaro

1 
2,781 
Consider the function f(x)=x^2+4x+1
a)Find h, the xcoordinate of the vertex of this parabola.

Nov407 12:20 AM
King Mickey

3 
1,464 
i don't understand why this notation is the same thing as
"A only if B"
to me "A only if B" reads that A is a...

Nov307 11:33 PM
Hurkyl

3 
1,282 
Can anyone recommend a good general purpose solver for optimisation problems. E.g. something better than Excels'...

Nov307 08:29 PM
phoenixthoth

1 
1,462 
We know that the function f(x) = sin(2*pi*x) vanishes at all integers, are there other functions like that and what is...

Nov307 05:05 PM
CRGreathouse

8 
1,949 
I can easily solve systems of equations with no complex numbers, could somebody give a short overview of the easiest...

Nov307 04:32 PM
arildno

4 
11,046 
I'm not going to take real analysis until next fall, but I don't know how I'll survive complex without knowing what...

Nov307 05:17 AM
matt grime

14 
2,424 
hi
can everybody help me to convert a homogenouos matrix to dual quaternion?
i know that from the rotational...

Nov307 03:44 AM
arnoldino

0 
2,999 
hello
i was wondering if there is a way to calculate the q dual quaternion from the equation :
Pout=q*Pin*q^1 ...

Nov207 04:39 PM
arnoldino

0 
1,117 
My prof writes this symbol that looks (sort of) like this \ni for "such that"
I just write the words "such that" in...

Nov207 11:09 AM
leon1127

5 
12,928 
hi
I got an IGCSE exam in two days and cant find any info on position vectors could sum1 please help me out. And...

Nov207 06:46 AM
mjsd

4 
1,125 
I am trying to find/create the equation for a straight line on a double logarithmic scale graph  what is the format...

Nov207 05:23 AM
cristo

4 
10,967 
My question is does anyone know of some good books at getting a well rounded understanding of math?
And the...

Nov107 09:37 PM
futurebird

4 
3,135 
http://www.wpr3.co.uk/UKMT/smc.html scroll down to q15
On this question that wants me to find the portion of the...

Nov107 04:15 PM
david18

0 
2,553 
K guys heres the problem
P= (3 1
1 3)
S=(4 2
2 4)
Calculate P^n and S^n for other values...

Nov107 12:01 AM
jballer23

17 
2,952 
Hi all,
This is a weird question,
I want to measure angles in terms of 360 degrees and not 180. The two lines...

Oct3107 09:10 PM
Jake

6 
3,841 
Do i need to use any theorem to solve this such as divergence theorem?
the first question need to find the volume...

Oct3107 07:18 PM
zhentil

1 
1,279 
Is there a general formula for calculating the arc length between two points along an ellipse?

Oct3107 10:30 AM
natski

6 
21,078 
I'm having trouble understanding a simple identity and was wondering if anyone could explain it to me:
Why is it...

Oct3107 09:29 AM
rbzima

2 
2,493 
To anyone interested (and near Tampa, FL), John H. Conway is giving a free lecture tomorrow evening (November 1st)....

Oct3107 08:35 AM
leprechaun

0 
2,314 
I was wondering if it is possible to convert a projectile motion(velocity, direction, etc) into a (parabolic)...

Oct3007 09:02 PM
tarkimos

3 
2,605 
I wasn't sure where precisely to put this, hopefully it gets an answer here.
In my computational physics class we...

Oct3007 08:23 PM
NeoDevin

0 
3,551 
suppose a finite set A={a1,a2...a_n} of different a_i. v is a function from {a1,a2...a_n} to R. B=max{p_1*v(a1),...

Oct3007 06:45 PM
sapporozoe

0 
2,378 
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 
1,275 
Hi Im taking senior maths challenge this year and was looking over some of the past paper questions. I did the first...

Oct3007 04:39 PM
david18

4 
1,673 
dont understand
For the following function, C computes the cost in millions of dollars of implementing a city...

Oct2907 10:23 PM
poohbear1986

10 
2,312 
Hi, can you please explain to me how Ramanujam got this formula for pi.
...

Oct2907 09:31 PM
morphism

2 
1,826 
Hi,
I was reading a general mathematics/ number theory (at least college level) book (NOT a textbook) at Barnes &...

Oct2907 02:20 PM
evacq8r

2 
1,265 
First post here. Would dearly like to have some answers for book I am writing on aesthetics and psychology. Can't find...

Oct2907 12:38 PM
mongoose

66 
8,220 
solve this iq questions
1)A health club has 600 members. 80% of them are males. 70% of the members use the...

Oct2907 12:35 PM
Werg22

3 
1,440 
How can I prove this?
Suppose X is a set of 16 distinct positive integers, X=\left\{{x_{1}, \cdots ,...

Oct2907 06:08 AM
Gib Z

2 
1,260 
this isn't really a homework problem
it's just me trying to understand a part of an example problem from a modern...

Oct2807 09:48 PM
Kurdt

8 
3,156 
so embarrased askin so much :redface:
On a table there are 14 cards. On each card there is a number between 1 to...

Oct2807 04:20 PM
Doom of Doom

4 
1,201 
I'm sure many of us don't need a teacher to learn a specific math subject, just a good textbook. Selfstudying allows...

Oct2807 12:36 PM
dodo

7 
2,707 
Consider line segments oriented vertically, horizontally, and either diagonally. The individual segments may be seen...

Oct2807 10:42 AM
CRGreathouse

6 
2,119 