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Jun1-13 07:36 PM Fredrik 
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General Math

- Math topics not applicable to the categories below. High-school Math
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Please post any and all homework or other textbook-style problems in one of the Homework & Coursework Questions...
Feb23-13 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....
Sep21-13 07:43 PM
techmologist
2 469
Hi, Does the author mean that −3 × 4 = 0 − 3 × 4 = −(3 × 4) or else? I consider the minus-sign to be a unary...
Sep21-13 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...
Sep21-13 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...
Sep21-13 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...
Sep20-13 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...
Sep20-13 01:47 PM
symbolipoint
9 615
I need some help understanding inverse functions, we've had a 4-page chapter covering the basics of inverse functions...
Sep19-13 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...
Sep19-13 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)...
Sep18-13 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...
Sep18-13 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...
Sep18-13 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...
Sep18-13 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...
Sep18-13 07:50 AM
MostlyHarmless
20 1,164
Hello all, I am currently reading about the triangle inequality, from this article...
Sep18-13 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...
Sep18-13 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)} =...
Sep17-13 11:55 PM
dipole
2 742
I am looking for a counting interpretation to make the following identity evident: ...
Sep17-13 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| +...
Sep17-13 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...
Sep17-13 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...
Sep17-13 04:19 AM
arildno
2 604
what is the defination of complex no?
Sep17-13 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...
Sep16-13 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...
Sep16-13 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...
Sep16-13 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...
Sep15-13 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...
Sep15-13 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...
Sep15-13 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...
Sep15-13 09:19 AM
Hepic
2 366
\sum_{i=1}^{n} Have looked and looked and cannot find it anywhere. EDITED: To correct mistake.
Sep15-13 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...
Sep15-13 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...
Sep15-13 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...
Sep15-13 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...
Sep15-13 04:56 AM
arildno
3 422
Its the attached picture. I'm not seeing why when using the dot product, they start using sin.
Sep15-13 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...
Sep14-13 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...
Sep14-13 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 ...
Sep14-13 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 ...
Sep14-13 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...
Sep14-13 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...
Sep14-13 04:05 AM
verty
11 569

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