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

Feb2313 09:23 AM
micromass

1 
38,233 
In Scenario 1. I travel 1000 KMs @ 100 KM/Hr. I reach my destination in 10 Hours.
In Scenario 2. I travel 600 KMs @...

T 06:14 PM
harrycool

0 
26 
In the late 1980's I asked my logic professor if there was some kind of logical and/or mathematical process which...

T 01:47 PM
HallsofIvy

4 
191 
greetings forum members, a first post.
I belong to a pianists forum. Many of us are using a digital piano (DP)...

T 10:39 AM
baaa

6 
163 
The best question I can ask at this point is this: is there a way to order things or arrange things of which it is not...

T 07:20 AM
alvin51015

3 
123 
I was tutoring someone for an intro mathematical logic class and there were a few problems about proving something is...

T 07:04 AM
HallsofIvy

8 
144 
How can I find the derivative of a step function?

T 07:01 AM
HallsofIvy

3 
120 
Hey guys, this is a little silly question but it bothers me. Im not a math genius (yet i hope) and im still in...

T 02:33 AM
Borek

10 
157 

 
 
 
Hi everyone. I hope this is in the proper place  not sure where to put it.
Anyway, I am working on an optimization...

Y 03:51 PM
Wolfman29

8 
467 
I am a little confused about how exactly vectors are used. For example, if we had the two statements
\vec{r} =...

Y 10:43 AM
olivermsun

1 
101 
I am reading through Borwein's paper, "Fast evaluation of the gamma function for small rational fractions using...

Y 08:35 AM
mesa

0 
85 
I was wondering if there is a field of mathematics which lies beyond and higher than abstract algebra? If it exists...

Y 07:47 AM
HallsofIvy

2 
131 
This question may sound simplistic but is there a mathematical process which lies directly beyond integration...

Y 05:45 AM
Char. Limit

4 
155 
Why can ratios be written as fractions?
if there are 5 men in 20 people the ratio of men to total people is 5:20...

Y 05:43 AM
Char. Limit

1 
104 
I have heard that the Borwein/Zucker algorithm for computing certain values of the gamma function is pretty awesome,...

Jul3014 02:06 PM
mesa

4 
145 
Hi. I'm wondering if it's an acceptable method of measuring distance between two objects of known size by averaging...

Jul3014 12:05 PM
ahouchin

20 
5,166 
The problem I am having is a problem in my textbook. It says that if we have xy Cartesian coordinate system, and if we...

Jul3014 10:33 AM
jedishrfu

2 
124 
I was wondering how that could be done.
I...

Jul3014 08:47 AM
Borek

6 
630 
I'm having a problem understanding exactly why trig functions are defined the way they are. Of course, the definition...

Jul3014 05:22 AM
bhillyard

3 
161 
So, out of curiosity, when you guys see log(x) do you assume base 10 or base e?
Because I just wasted 2 hours of...

Jul3014 03:15 AM
NathanaelNolk

13 
292 
I'm reading a book  and I've been stuck for a while on the same page. This is only a calculus question. We have the...

Jul2914 09:12 PM
Matterwave

1 
127 
Hey guys,
I'm puzzling a bit over an example I read in Rudin's Principles of Mathematical Analysis. He has just...

Jul2914 05:53 PM
Fredrik

1 
126 
Hello,
i'm working through Lang's 'Introduction To Linear Algebra' and am on page 18 (in case any of you are...

Jul2914 11:59 AM
jedishrfu

1 
105 
This is not a high school question, but it seems to be too broad to fit in any of the other categories. Fractals are...

Jul2914 07:42 AM
nomadreid

2 
148 
Hi,
I found this derivation at wiki: http://en.wikipedia.org/wiki/Shell_theorem
Can someone tell me if the theorem...

Jul2914 02:17 AM
Matterwave

12 
208 
I know not all shapes satisfy this relationship, but what is your intuition behind this formula that finds area...

Jul2814 11:10 PM
WWGD

7 
191 
Hi,
I visited my Mother and Stepfather recently, and admired the tall trees around their house.
We estimated...

Jul2814 09:00 PM
infinity149

9 
1,818 
I know how to factorize a polynomial over C, but what do complex factors show? Real factors show where the graph cuts...

Jul2814 02:37 PM
Hertz

2 
176 
Hello,
Is there any formula that describes every other odd number, for ##n = 1,2,\dots##? I can't seem to find...

Jul2714 07:14 PM
HallsofIvy

6 
408 
Theoretically it is said that, tangent touches to a single point on a circle. But If my circle is very big, and large...

Jul2714 12:42 PM
adrianmitrea

10 
440 
Hi there,
Consider a related rates problem,
Gas is being added into a balloon at a rate of dE/dt = x ft^3/sec ...

Jul2614 04:33 PM
micromass

20 
745 
Hi, all. I'm in desperate need of assistance with a matrix I can't get my head around of. I want to solve a system of...

Jul2614 03:24 PM
skujesco2014

0 
285 
Suppose T=T(r,θ)=G(x,y)
How do you prove ∇T(r,θ)=∇G(x,y)?
I can think of some arguments in favor of this equality,...

Jul2614 09:10 AM
davidbenari

3 
387 
If you rotate your rectangular coordinate system (x,y) so that the rotated x'axis is parallel to a vector (a,b), in...

Jul2614 06:33 AM
HallsofIvy

4 
659 
after it was found out that the first 9 pi digits 141592653 result in the end sum of 9, i searched for its iteration...

Jul2514 10:19 PM
9I.

2 
372 
If I have the following transfer function:
x = A1 + A2*y + A3*sin(A4*y + A5) + A6*sin(A7*y + A8) +A9*sin(A10*y +...

Jul2514 04:15 PM
SteamKing

1 
208 
Hey guys,
Struggling with understanding this taylor vs. maclaurin series stuff.
So a few questions. Let's say...

Jul2514 02:34 AM
Simon Bridge

3 
405 
Hey,
I've begun going through a book called "An introduction to geophysical exploration" by Phillip Kearey and...

Jul2414 10:51 PM
AlecYates

5 
305 
from wiki:
Suppose we have a hemisphere of radius 10 r10 (a) and cut it in ten horizontal slices (1 is on the...

Jul2414 09:16 AM
bobie

9 
394 
I'm currently reading Tolstov's Fourier series and in page 58 he talks about a criterion for the completeness of a...

Jul2414 09:06 AM
Chacabucogod

0 
227 