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

Feb2313 09:23 AM
micromass

1 
39,285 
A friend posed this just for fun but now its really annoying me.
how do you divide 90 into three parts so that each...

Sep612 01:50 PM
phinds

4 
894 
For a general family of dynamic models, xk+1=f(xk), oscillation can occur; for example, the function xk+1=xn21...

Sep612 02:44 PM
camjohn

11 
1,478 
Hello
i want to know if we have a series with this equation...

Sep612 03:29 PM
mathman

6 
845 
I'm attempting to convert the following parametric equation into into one f(x, y, z), and am running into difficulty. ...

Sep612 07:34 PM
chiro

7 
2,647 
Hi, I need help about the convolution of 3 functions as shown in
attached file via FFT. Specially I need help...

Sep612 11:55 PM
salzrah

1 
1,051 
1 = 1
1  2^2 = (1+2)
1  2^2 + 3^2 = (1+2+3)
1^2  2^2 + 3^2  4^2 = (1+2+3+4)
and so on.
I have to prove...

Sep712 03:23 AM
Venomily

4 
820 
In inner product spaces of polynomials, what is the point of finding the angle and distance between two polynomials?...

Sep812 07:00 AM
chiro

1 
1,354 
Hello everyone,
I'm beginning a research project for a Math History class on Archimedes. Since technically it is a...

Sep812 07:38 AM
coolul007

3 
943 
Hi everyone! I'm a new user of this forum!
I was interested in learning to make proofs of the various theorems.
Is...

Sep812 11:51 PM
Matt Benesi

8 
971 
Hello,
I'm wondering if a common assumption is correct: if the odds of winning a lotto game are, say, 1,000,000:1,...

Sep912 11:23 AM
Pengwuino

1 
736 
Well, I found this challenge in another forum (not about math) on the internet, and, originally, there were no 'w',...

Sep912 04:07 PM
henrique_p

12 
2,034 
H is a contravariant transformation matrix, M is a covariant transformation matrix, G is the metric tensor and G1 is...

Sep912 07:59 PM
nigelscott

8 
1,294 
When I was little, I noticed that any even number less than 10 multiplied by 6 ends in itself and leads with one half...

Sep1012 05:17 AM
arildno

2 
646 
Hi everybody !!
I have a question about discrete integrals with contours. I want to integrate
the points that...

Sep1012 05:46 AM
alitas

7 
1,490 
Okay I need to rotate a parabola on a cartesian coordinate system, y=x^2 by 90 degrees about the origin (either...

Sep1012 03:09 PM
mesa

4 
1,017 
Apparently one can deduce the form of divergence in polar (and spherical) coördinates using the theorem of Gauss and...

Sep1012 04:40 PM
dolphus

1 
1,942 
Just stumbled upon something and I've never been taught it before and cannot see why its true... Hoping someone can...

Sep1012 09:47 PM
Mentallic

4 
812 
My probability class has me wondering about pure math questions now. We started with the axioms and are slowly...

Sep1012 11:58 PM
chiro

4 
1,085 
How do you define a right handed coordinate system for a basis which is not orthonormal?

Sep1112 12:00 AM
chiro

5 
828 
Hi,
I've been studying uncertainty in measurement. I'm not sure how to decide if the uncertainty of a given...

Sep1112 12:04 AM
chiro

1 
883 
The question was given: x(t) = (sin2t + sin3t)/2*sint
determine the period. So I converted numerator and...

Sep1112 11:23 AM
toneboy1

18 
2,540 
How would one solve the following WITHOUT a calculator?
Sub in t as x^{\frac{1}{2}}
4x+8=33x^{\frac{1}{2}}
I...

Sep1112 12:39 PM
Mark44

9 
1,845 
On a math test, one of the questions was to solve \sqrt{7x}=\frac{x^2}{2}+12x10. I solved graphically with a...

Sep1112 07:43 PM
uart

6 
1,807 
How do I solve this? :eek:

Sep1212 03:12 AM
Sulfur

4 
977 
I have a problem taking the log of this expression \prod_{i=1}^m
Now I would get \ln({\frac{1}{\sqrt{2\pi...

Sep1312 12:09 PM
Polymath89

3 
862 
Hi all, I have a seemingly simple problem which is I'd like to efficiently evaluate the following sums:
Y_k =...

Sep1312 06:56 PM
AlephZero

1 
813 
Hi :)
I have questions regarding the binary properties of numbers.
I would like to discuss some very specific...

Sep1412 11:12 AM
HermyTheCrab

33 
3,501 
If you notice that there is symmetry in the numbers 0 to 10 this is a good place to start with what I want to talk...

Sep1412 12:00 PM
micromass

22 
2,044 
Folks,
I am struggling to see what is happening here particularly when ## \displaystyle \sum_{i=1}^{n1}##...

Sep1412 01:09 PM
bugatti79

2 
1,138 
I have figured out the answer to the question, but I have no idea why and how it works.
I have attached a copy of...

Sep1512 12:23 PM
Taylor_1989

2 
819 
Hi all,
I have a general question about relative error. Suppose that we have a vector of measurements...

Sep1612 04:49 PM
andresc889

0 
1,272 
Simplify the following expression.
(2+1×2)−4×6
=(2+2)−4×6
=4−4×6
=4−24
=−20

Sep1612 11:38 PM
Iccanui

8 
1,445 
I would just like someone to check maths for this venn diagram, just to make sure I have done the calculations...

Sep1712 07:55 AM
Taylor_1989

3 
927 
Suppose I have a function f defined on x, f(x) = (x^2)/x and another function g defined on x, g(x) = x. Are both these...

Sep1712 05:01 PM
dextercioby

2 
848 
Can I do operations like {\aleph_0}^{\aleph_0}mod {\aleph_0}
and would this equal \aleph_0

Sep1812 12:43 AM
chiro

1 
535 
Hi everybody;
I am a bit stuck with negative angles. What I know is that: If we measure an angle from xaxis...

Sep1812 01:36 AM
Zalajbeg

7 
2,517 
Is it okay to mix the types of brackets you use when writing out a solution to help make it a bit clearer?
For...

Sep1812 02:37 AM
NascentOxygen

12 
1,074 
I know that e^{rx} is an infinitely differentiable function.
However, say you have f= x. this is clearly one time...

Sep1812 03:04 AM
damabo

4 
853 
Hi guys,
I'm trying to sort out the following formula, but just can't find out how to solve for 'x'.
Could you...

Sep1812 07:27 AM
HallsofIvy

9 
1,118 
is there a relation between the numerical answers of cos5A and cosA?
sin4A and sinA?
i want to work...

Sep1812 12:50 PM
Studiot

12 
1,309 