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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.
Y 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
1 36,861
Are there any complex solutions to cos x = 2?
Y 08:15 PM
johann1301
3 122
Obviously it will take some brute-force. But how do I minimize the brute-force needed (optimize)? I know one can solve...
Y 04:41 PM
jedishrfu
1 105
A function f(x) where f(x)=length of the graph curve/line from 0 to x Can this function be expressed in algebraic...
Y 11:08 AM
MrAnchovy
8 256
I was wondering how that could be done. I...
Y 10:19 AM
George Jones
2 118
So it was my observation that all the prime numbers I saw ended with digits 1,3,7,9.Is this true for all primes? Is it...
Y 09:21 AM
micromass
8 124
Why are perfect numbers important? What is the best way of introducing these numbers to a first course on number...
Y 03:55 AM
micromass
2 148
If you rotate your rectangular coordinate system (x,y) so that the rotated x'-axis is parallel to a vector (a,b), in...
Jul21-14 05:03 PM
George Jones
1 110
Hi! I posted a new thread about a week ago, but so far no one was able to help me: ...
Jul21-14 02:21 PM
Tusike
0 86
consider a sin wave to find the average of this function over interval 2pi, why not just do... ...
Jul21-14 01:49 PM
George Jones
4 215
reliability means the probability of device that device will perform for given time interval under given condition or...
Jul21-14 10:06 AM
vead
0 88
Our company is holding a weight loss contest consisting of 5 people teams. If one of the people weigh in but cant...
Jul21-14 03:08 AM
20GT
22 633
Hello, What is an affine function? My professor has been throwing around this term in the lecture videos and I have...
Jul19-14 11:42 PM
SteamKing
1 280
Guys, I have a problem I'm trying to solve for work (we're trying to inspect a hole, and I'm trying to determine...
Jul18-14 01:48 PM
bahamagreen
4 386
Hi everyone! I am looking for an equation for a projectile which takes into account air resistance. I preferably want...
Jul18-14 12:47 PM
mfb
1 212
I always thought the derivatives (or generally any operation with infinitesimal (infinitely large) values) belongs to...
Jul18-14 11:44 AM
micromass
27 1,299
Suppose I have three statements of congruence: x = a mod n, y = b mod m, z = c mod p; Furthermore, x is a given...
Jul18-14 08:38 AM
1MileCrash
2 275
I was doing some basic analysis of the Dedekind eta function and some Dirichlet series and the following equality just...
Jul18-14 07:50 AM
Simon Bridge
1 359
I am puzzled by the following example of the application of binomial expansion from Bostock and Chandler's book Pure...
Jul18-14 12:17 AM
Simon Bridge
7 2,004
Let's say I wanted to do the following calculation: (x^2 + 2x + 1) / (x+1) I've scrolled through some online...
Jul17-14 03:02 PM
symbolipoint
14 786
I am a UK iB student who has just finished year 12 (penultimate year) of secondary education. As part of the iB I...
Jul17-14 03:04 AM
austrosam
2 497
Hi! I came across the below thread where a user ('krackers') asked for a proof of the PSF factorising method for...
Jul17-14 01:15 AM
bairdos
1 395
Hi, I visited my Mother and Stepfather recently, and admired the tall trees around their house. We estimated...
Jul16-14 06:04 PM
micromass
8 992
I know how to prove this via limits and I'm okay with that. What I want to understand is the interpretation of the...
Jul15-14 08:20 PM
AlephZero
3 548
My question is somewhat dumb but for some reason I haven't been able to come up with an answer. Why is the...
Jul14-14 02:31 PM
jbunniii
4 962
Please see the attached,which was quoted from the following website: http://en.wikipedia.org/wiki/Modular_arithmetic...
Jul14-14 09:42 AM
Delta²
7 1,076
Hi, I was wondering if there is a way to prove the area of the Koch Snowflake via induction? At the moment I have the...
Jul13-14 10:04 AM
Simon Bridge
1 716
Hi all, During my research i ran into the following general type of equation: \exp(ax+b)=\frac{cx+d}{ex+f} does...
Jul13-14 07:30 AM
HallsofIvy
3 963
for about first 429407636 pi digits where can i get such software or how can i calculate it? (i have 1b pi digits)
Jul12-14 12:12 AM
jedishrfu
1 1,068
Hello all, I am looking for exact forms (as real number expressions) of the golden ration that are not rewrites of the...
Jul11-14 10:50 AM
mesa
2 1,100
I was recently told that base Pi can only be speculation because it irrational. However the Euler formula uses e. e is...
Jul11-14 08:52 AM
HallsofIvy
6 1,199
As a programming exercise I wrote a program to generate primes. First I generated a billion of them (the one billionth...
Jul10-14 08:08 PM
HallsofIvy
2 935
Does anyone know of an online calculator that can form an equation of a curve with complex values and lots parameters?...
Jul10-14 08:06 PM
symbolipoint
1 873
If the Parallel Axiom is just one of several possible assumptions, why is it that so many mathematical relationships...
Jul10-14 05:15 AM
maline
2 1,036
Hi, I have a question about : http://imgur.com/RU7PvtJ I actually understand what I need to do. I need to see...
Jul9-14 08:28 PM
chemistry1
4 909
Hi, I'm having trouble understanding the following fact about limits : If f(x)<=g(x) for all x on (a,b) (except...
Jul9-14 08:00 PM
chemistry1
4 935
Just recently I decided to buy an ozone generator that can produce 4 grams of ozone / hour. However, I did a little...
Jul9-14 05:57 PM
MrAnchovy
13 1,605
I want to learn algebra II, trig and calc over the summer but I have a terrible time learning by reading, so is there...
Jul9-14 04:08 PM
HakimPhilo
4 1,610
We know that i^3 is -i . But I am getting confused, because I thought that i can be written as √(-1) and i^3 = √(-1)...
Jul9-14 03:59 PM
HakimPhilo
6 1,344
Why did Germain come up with her Germain primes? I am intrigued to know why Sophie came across these primes. Do they...
Jul9-14 10:20 AM
micromass
1 849
I'm wondering if Pi is a rational number in any other base besides base Pi. Also is there a formula or function to...
Jul9-14 05:25 AM
symbolipoint
19 4,837

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