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

Feb2313 09:23 AM
micromass

1 
33,167 
Suppose I take a random walk on a 2 dimensional square lattice, but this lattice plane has a finite size, e.g. Dx*Dy....

Sep2113 07:43 PM
techmologist

2 
469 
Hi,
Does the author mean that −3 × 4 = 0 − 3 × 4 = −(3 × 4) or else?
I consider the minussign to be a unary...

Sep2113 12:47 PM
Atran

7 
595 
How to determine the X coordinate of the red point if i know the Y coordinate and the angle between the adjacent side...

Sep2113 12:23 PM
Office_Shredder

4 
675 
I have a sum
\sum_{n=\infty}^{\infty} f(n)
which I do not want to consider the convergence of in the normal...

Sep2113 07:17 AM
jackmell

3 
603 
I'm just curious, but when will I know that it's not just carelessness that is causing me not to be able to do the...

Sep2013 03:03 PM
LCKurtz

1 
619 
I was pondering over this problem about ratios and wondered what does 3/2 (oranges:apples say) actually means. I then...

Sep2013 01:47 PM
symbolipoint

9 
615 
I need some help understanding inverse functions, we've had a 4page chapter covering the basics of inverse functions...

Sep1913 12:22 PM
HallsofIvy

3 
543 
While reading this paper I came across the term Cone of Influence which is described as
As an example: We have a...

Sep1913 06:59 AM
MednataMiza

0 
532 
Hi there!
I am seeking a nice formula for the following function S(k,n), k and n natural numbers, k<=n, where S(k,n)...

Sep1813 06:48 PM
arildno

8 
718 
I was always good at maths, just because primary/high school math was simple enough to find concrete examples for the...

Sep1813 05:27 PM
D H

9 
763 
Please take me seriously, I know proving Fermat last theorem is not easy but I may have just proved it for a special...

Sep1813 11:47 AM
mohamadh95

9 
860 
I'm curious if there is a way to combine sinusoids of multiple frequency into a single sinusoid?
For example, I'm...

Sep1813 09:41 AM
arildno

5 
719 
This news is a little dated, but I still found it interesting and wanted to see what everyone else thought about this...

Sep1813 07:50 AM
MostlyHarmless

20 
1,164 
Hello all,
I am currently reading about the triangle inequality, from this article...

Sep1813 07:22 AM
UltrafastPED

3 
446 
Ever since I was in grade school I have been fascinated with the idea that the Pythagorean theorem, or any other...

Sep1813 12:09 AM
Mark44

4 
764 
I'm doing a proof, and near the last step I want to write the expression,
\frac{d}{dt} \det{A(t)} =...

Sep1713 11:55 PM
dipole

2 
742 
I am looking for a counting interpretation to make the following identity evident:
...

Sep1713 08:59 PM
techmologist

2 
463 
In Spivak's Calculus, Chapter 1, pg 12, theorem 1, it says that in order to prove that theorem: a + b <= a +...

Sep1713 06:46 PM
Office_Shredder

1 
482 
I run this channel
http://www.youtube.com/user/PhysicsAtTen
and NEED your help!
Please give me ideas to work on...

Sep1713 05:03 PM
Yosty22

1 
590 
Sorry for my stupid question,but I forgot them.
What is the biggest and the lowest value that can get the "sin" and...

Sep1713 04:19 AM
arildno

2 
604 
what is the defination of complex no?

Sep1713 03:33 AM
Borek

2 
372 
I got a b in my last math test and the ONLY reason I missed the questions I missed was because of sign errors. I...

Sep1613 03:54 PM
fedaykin

6 
703 
I think a lot a users have vague concepts about the roots of unity.
I try to post a link to WolframAlpha, which...

Sep1613 06:40 AM
arildno

10 
765 
Dear,
I assume that a signal S is expressed as S = a*S1 + b*S2,
where a, b are weight constant, and S1, S2 are...

Sep1613 02:39 AM
Chriszz

2 
431 
I have a question about complex valued functions, say f(z) where z=x+iy is a complex variable.
Can every such...

Sep1513 10:13 PM
mathsciguy

7 
577 
I did a problem for my teacher (literally speaking) that he was having trouble remembering, and it was relatively...

Sep1513 06:31 PM
pwsnafu

4 
517 
Hello,
I am confused how vectors that are coplanar will give a triple product of zero? Or is it the case that all 3...

Sep1513 04:51 PM
Woopydalan

2 
552 
Lets say z!=0, and zeC(is complex).
So for example is z=2+3i.
z^0=1 => (2+3i)^0=1. I am correct? I know that...

Sep1513 09:19 AM
Hepic

2 
366 
\sum_{i=1}^{n}
Have looked and looked and cannot find it anywhere.
EDITED: To correct mistake.

Sep1513 08:51 AM
arildno

5 
537 
Complex numbers?
Since the system is not an ordered pair, how then is it defined using the complex system as an...

Sep1513 07:35 AM
lostcauses10x

6 
656 
What the best way to introduce congruences in a number theory course? I am looking for something which will have an...

Sep1513 07:32 AM
jackmell

1 
470 
A = 52 30 8 2
43 36 7 1
51 32 10 2
65 21 15 2
64 22 20 1
How to find Pseudo inverse of A. (AT*A)1*AT. Is this...

Sep1513 07:16 AM
rovaniemi

0 
321 
I know that in logarithms we can not set as base a negative number,but look at this(in the brackets I will put the...

Sep1513 04:56 AM
arildno

3 
422 
Its the attached picture. I'm not seeing why when using the dot product, they start using sin.

Sep1513 01:09 AM
UltrafastPED

4 
407 
So all my life I have disliked writing in scientific notation's notation as mx10n where m and n are constants, because...

Sep1413 11:42 PM
SteamKing

6 
492 
i know when you are dealing with limits you can take the inverse to fit the standard limit equations.
how about...

Sep1413 02:55 PM
Mandelbroth

4 
538 
Marilyn vos Savant, who claims to be in the Guinness Hall of Fame for “World’s Highest IQ.”,
has written the book ...

Sep1413 09:28 AM
D H

25 
1,290 
I mean if a normal person doesnt understand it thats fine but when scientists are wrong about it it drives me insane
...

Sep1413 08:43 AM
D H

15 
877 
Hello, I was not sure quite where to post this but settles on here. I am a 15 year old and I am having an issue. I...

Sep1413 04:13 AM
tridianprime

3 
493 
1) Are there any proofs that sine cosine and tangent are the same in all similiar triangles? Like, that sine 30...

Sep1413 04:05 AM
verty

11 
569 