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

Feb2313 09:23 AM
micromass

1 
36,957 
Does anyone can solve the following equation?
x − 1 = 1 − x
Thanks
Tom

Aug3107 10:22 AM
cks

13 
1,787 
We know that anything divided by zero is 'undefined' or equal to infinity. Is it not possible to define in anyway such...

Aug3107 10:01 AM
ron_jay

14 
3,341 
Hi all.
I am learning a numerical method that involves Fourier transform.
As far as I know, I think Fourier...

Aug3107 01:42 AM
hanson

0 
1,222 
I am trying to remember the formulas and ways to do this but I am have much trouble! Please help! Thank you!
1) Find...

Aug3107 01:14 AM
d_leet

7 
1,994 
It seems that if the number 9 is multiplied by a number, the resulting digits of that number will sum to 9. Does this...

Aug3007 07:33 AM
Gib Z

10 
1,744 
I found this problem off of mathematics magazine and I want to give it a try solving it, but i'm lost for ideas.
...

Aug2907 06:17 PM
PowerIso

12 
2,841 
My teacher told me that
C sin(k x) + D cos(k x) = F sin(k x+gamma)
if neither C nor D is 0 (gamma is a phase...

Aug2907 03:12 PM
genneth

3 
1,621 
Please can someone tell me whether anyone has managed to classify all possible 3D shapes into a finite and usefully...

Aug2907 09:59 AM
Aeneas

2 
2,312 
I'm stuck on this math problem for my physics class, I'm sure it's not that difficult, but it confuses me:
The...

Aug2907 09:47 AM
Nesk

7 
1,476 
Please can someone tell me whether has managed to classify all possible 3D shapes into a finite and usefully small...

Aug2807 06:47 AM
Aeneas

0 
1,745 
Hello,
Please excuse me if I may sound an ignorant compared to all of you, but I was always stupid and never paid...

Aug2707 08:14 PM
Hurkyl

33 
3,495 
Is "The modulus function" one function or two? f(x) = x suggests one, but f(x)=x, x>=0, f(x)=x, x<0, suggests two.

Aug2707 11:50 AM
Aeneas

3 
4,541 
Hi,
I have recently cracked a password for a zip file using brute force which got me thinking. Lets say that the...

Aug2707 11:10 AM
CRGreathouse

5 
1,614 
the chance of a coin toss coming up heads is 1 in 2. i assume that the chance of it coming up heads twice in a row is...

Aug2707 09:07 AM
subhailc

2 
13,929 
hi.
having 3 point of a quadratic bezier curve(start, control, end), how i can calculate the length of curve.

Aug2607 02:39 PM
Raza

2 
3,942 
dear SGT,i have problem with H matrix,called the measurement matrix,i mean i dont know how to solve
Z=H*X,
X=6*1...

Aug2607 03:05 AM
bilucent

0 
2,357 
Here's an interesting question. I'm aware of closed forms of cubic polynomials that go through 1 or 2 specific (x,y)...

Aug2407 11:43 PM
hotvette

5 
2,712 
Hi there everyone,
I'm troubled with a certain problem. I'm trying to locate the circles of view in perspective...

Aug2407 04:17 PM
gillianseed84

5 
1,318 
in my book this is called the lower bound but it implies that it might be called the greatest lower bound elsewhere.
...

Aug2407 05:32 AM
HallsofIvy

5 
7,302 
i have no way to deal with the math problems,so i don;t know how to do.Do you think what should i do ??...

Aug2407 05:28 AM
HallsofIvy

2 
1,413 
is there any difference between the two discplines, and what is it?
p.s
what do you think of emil artin's...

Aug2307 08:34 PM
Emmanuel114

10 
4,357 
rather a silly question, but i am a bit confused , could we consider the expression
x^{2}y^{2}+3xyx^{4}+5y^{4}+...

Aug2307 04:21 PM
mathman

1 
836 
Okay, i'm wondering if an investment that averages x% over the term of an investent and an investment with a fixed...

Aug2307 03:49 PM
CRGreathouse

2 
1,237 
I think I found a simple formula if I was putting in the same amount of money each year, but what if I wanted to start...

Aug2307 03:46 PM
CRGreathouse

3 
2,179 
What methods are there to show that three points are, or aren't collinear?
I know the standard, check the slopes...

Aug2307 01:52 PM
HallsofIvy

2 
1,587 
Hi,
I don't mave MUCH of a Math back ground, mainly math used for the line of work I am in (Currency Analyst) and...

Aug2207 11:44 PM
Jude143

13 
2,908 
Assuming we define the cardinal number for a set A as the least ordinal number b such that A and b are equipollent,...

Aug2207 06:41 AM
matt grime

3 
1,081 
this isn't homework this is from a book im reading for fun
L is the set of all negative rationals and zero and all...

Aug2207 06:38 AM
HallsofIvy

1 
4,125 
How can I calculate the probablity of 2 same numbers being right next to each other, when 100 random numbers chosen...

Aug2107 08:47 PM
Mins

7 
1,658 
Is the Euler line in triangles USEFUL for anything in real life? This is the line which contains the concurrency...

Aug2107 01:40 PM
symbolipoint

0 
1,805 
In how many ways the letters in the word PARALLEL can be arranged so that there will always be two "L"s together as in...

Aug2107 12:41 PM
robert Ihnot

10 
2,062 
Hi guys. I have a problem with an integration problem I've recently stumbled upon.
\int \frac{1}{sin^{1}...

Aug2007 09:14 AM
truewt

16 
2,248 
Is every subspace of a connected space connected?

Aug2007 03:55 AM
matt grime

12 
5,105 
f(x) is an even function if f(x) = f(x) for any x in the domain of f.
Now I say that f(x) = x^2 is defined on . Can...

Aug1907 09:22 PM
HallsofIvy

3 
1,553 
hello
i have two type of two joint quadratic bezier curve
you can saw a sample in the picture
how i can find the...

Aug1907 01:42 AM
temp

0 
1,962 
I'm looking for the name of the optimistic conjecture that, if I remember correctly, conjectures the existence of a...

Aug1807 11:26 PM
mathwonk

4 
1,811 
silly question. didnt know where it was meant to go so i just put it here as safest option:)
suppose a curve C is...

Aug1807 04:44 PM
WWGD

3 
1,978 
Hi everybody,
In physics and mathematics, we often use the theorem that the circle alway has the smallest perimeter...

Aug1807 03:46 PM
arildno

1 
2,399 
Definitions:
"x is a limit point of A" = "All neighborhoods of x contain an infinite amount of points of A"
"x is a...

Aug1707 11:20 AM
MathematicalPhysicist

15 
6,728 
If f \cdot f and f \cdot f \cdot f is smooth, does it follow that f is smooth?
So does f \cdot f \in...

Aug1607 11:23 PM
Hurkyl

1 
1,330 