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General Math

- Math topics not applicable to the categories below. High-school Math
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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
1 38,941
And if so, could I take the ith root of i?
Aug29-10 01:15 PM
Petr Mugver
1 1,881
Let f(x) be the following function: f(x)=\infty,if x<0 or x>a;f(x)=0,if 0<x<a. What’s the derivative of f(x) at...
Aug29-10 09:00 AM
4 1,183
I've been kicking myself trying to think of a few real world applications of cubic equations (and x^4 quintive?). Can...
Aug29-10 08:47 AM
12 44,573
Example: Inflation over time Supposed that I want calculate the final percent change in a 10 year period. (year ,...
Aug28-10 11:39 PM
3 5,752
Why does |e^i| = 1 ?
Aug28-10 01:11 PM
10 5,960
Hi Just a simple Mod question. Is (ka)mod kb = k(a mod b)? Thanks
Aug28-10 08:57 AM
12 1,723
Aug28-10 04:44 AM
1 757
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
3 1,056
I'm having trouble grasping this concept. This is the part in question: Why is the point x uniquely determined...
Aug27-10 11:45 PM
8 2,906
I know that \sum_{n=-\infty}^\infty{1} = \infty But I don't understand why. It...
Aug27-10 11:41 PM
4 1,198
On the TI89 calculator SortA and SortD return out-of-order responses. How could I be doing anything wrong, really? I...
Aug27-10 09:27 PM
0 1,013
Hello, I was looking at some math problems and one kind caught my attention. The idea was to prove that lets say...
Aug27-10 11:00 AM
3 746
Hello Math friends, I need some help in hyperplanes. Basically, I need to calculate a random hyperplane that...
Aug27-10 03:06 AM
Petr Mugver
13 1,973
I want to understand intuitively why it seems to be that when evaluating an integral at infinite, it only seems to...
Aug27-10 02:20 AM
robert Ihnot
6 2,120
Hello, and thank you for any assistance offered. I believe the attached nested radical to converge to a value, but...
Aug27-10 02:12 AM
1 1,123
I always wondered how you can differentiate a^x from first principles with the limit as dx approaches zero but I never...
Aug26-10 04:07 PM
Philip Wood
11 6,067
Hi guys, As somebody who likes to learn and understand everyday problems I've really hit a wall... I learnt...
Aug26-10 05:03 AM
0 2,881
Hi! I see there are three 3D coordinate systems based on either 3 number (cartesian), 2 numbers and 1 angle...
Aug26-10 01:20 AM
3 899
I know I probably learned this 10 years ago, but I really have no idea how to simplify something like this: (A*B +...
Aug25-10 11:08 PM
robert Ihnot
6 1,154
Why is average relative velocity equal to the square root of 2 times the magnitude of the x direction velocity? I'm...
Aug25-10 03:34 PM
1 2,231
Any suggestions on how to approach solving: \Psi(m,n) \leq \Psi\left(\left...
Aug25-10 02:38 PM
1 917
The Example is ; Solve the recurrence relation a n-1 + a n-3 = 0 where n ≥ 3 and a 1 = 1 a 2 = 1 a 3 = 2 a n =...
Aug24-10 03:33 PM
1 2,170
I am trying to figure out a way to prove this without using much set theory (i know that the rationals are countable...
Aug24-10 01:27 PM
1 949
Hi can anyone help me plz or give me a strong hint? I have to prove this: If f(x) is a function from natural to...
Aug24-10 11:50 AM
26 3,574
Not a homework question, no worries. :) It's actually a work question. We have a slope top foundation that we...
Aug24-10 08:39 AM
0 591
Suppose we have this absolute value question | x-3 | = 3 – x If we solve this question we break it as X - 3 = 3 – x...
Aug24-10 08:37 AM
1 1,074
Hello all Does Godel's incompleteness theorem still hold true for fuzzy sets? My feeling is that it doesn't...
Aug24-10 02:34 AM
1 1,078
I solved this absolute value equation and I am confuse about the answer given in the book for this question, the...
Aug23-10 06:43 PM
1 1,728
Greetings PF, I am would like to play with using an automated theorem prover to reason about categories. I would...
Aug23-10 06:26 PM
0 571
Guys does anyone know of a technique to find the exponential of a tridiagonal symmetric matrix... Thanks in...
Aug23-10 05:14 PM
1 1,764
Someone try to solve this, and don't cheat and use a TI89 or similar CAS, a scientific calculator and a pen and paper....
Aug23-10 03:55 PM
8 1,580
I've got what might be a couple of very basic questions on the fundamental representations of locally isomorphic...
Aug23-10 02:04 PM
0 776
I noticed that, for resistors in a parallel circuit, where R1 is < R2, the minimum value is (R1)/2, and the maximum...
Aug23-10 09:27 AM
1 1,897
Prove that \prod_{j=1}^{\infty}\left(1-\frac{1}{f(j)}\right)>0 for all f:\mathbb{N}^{+}\to\mathbb{R}^{+} which satisfy...
Aug22-10 11:41 PM
11 1,502
My lecturer used a symbol in class that represents an element being removed from a set to form a new set. Does anyone...
Aug22-10 10:17 PM
6 1,242
or pay a prepayment penalty? Il
Aug22-10 01:28 PM
4 694
What is Fermat's last theorem? and How is that related to primes numbers of form 3x+1 and 3x+2
Aug21-10 07:12 AM
2 905
A negative number has the minus sign as its own intrinsic operator. Has anyone thought of using the divide symbol in a...
Aug20-10 11:56 PM
6 1,382
Hi Two vectors A and B are equal if they have the same magnitude and the same direction . this property allows...
Aug20-10 05:19 PM
2 998
What do you think about Golbach's Conjecture? Statistical analysis has shown that it is highly unlikely to be False,...
Aug20-10 05:06 PM
0 1,750

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