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Common math questions, quality answers.
Jul24-14 10:02 AM Greg Bernhardt 
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Test your skills. Math challenges will be posted at least once a week. Suggestions for problems are welcomed. Brought to you by Office_Shredder.
T 12:54 PM pasmith 
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Jan16-12 Greg Bernhardt
Please post any and all homework or other textbook-style problems in one of the Homework & Coursework Questions...
Feb23-13 09:23 AM
micromass
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i have an object and a 3d direction vector and position for it . I would like to know how do i determine if a certain...
Oct25-10 09:57 AM
HallsofIvy
1 1,010
Hi, i=e^{\frac{\pi }{2}i}=e^{\frac{5\pi }{2}i}\Rightarrow e^{\frac{\pi }{2}ii}=e^{\frac{5\pi }{2}ii}=e^{-\frac{\pi...
Oct25-10 09:52 AM
HallsofIvy
15 10,904
In the second degree equation of a conic section (ellipse/hyperbola), I have seen many books following this method to...
Oct25-10 04:08 AM
zorro
4 3,366
Hey, I'm studying Predicate Logic at the moment and I can't seem to wrap my head around the way that english...
Oct24-10 07:08 PM
JSuarez
3 3,644
how displacement and velocity can be negative.
Oct24-10 07:07 PM
donutz610
2 867
Problem: We want to calculate a polynomial of degree N-1 that crosses N known points in the plane. Solution A:...
Oct24-10 05:19 PM
CRGreathouse
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Given a function f : K \to K, where K = \{1,2,...,n-1\}, how many permutations \sigma \in S_n exists such that...
Oct24-10 01:01 PM
disregardthat
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Can someone tell me what a riemann invariant is in general terms please? i cant find it anywhere! thanks, lav
Oct24-10 12:52 PM
slider142
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This is supposed to be a proof of trigonometric multiplication of complex numbers: http://i.imgur.com/0I9sN.png What...
Oct24-10 07:00 AM
embassyhill
2 1,895
Hello! i have a vector problem. I am a currently designing a 3d game and i want my enemy ships in certain...
Oct24-10 05:05 AM
badescuga
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Howdy everyone, I'm on a quest for something that is proving a bit elusive at the moment: a Cartesian to polar...
Oct24-10 02:34 AM
chasehusky
1 953
Greetings, Is a half-circle a parabola? I am guessing yes because it is a conic section, the very bottom of the...
Oct23-10 09:17 PM
CosmicVoyager
4 4,429
consider a function f(x)= \sqrt{2x^2-x^3} if i take x^3 common from inside the cube root the function becomes f(x)=...
Oct23-10 08:57 PM
disregardthat
6 837
Hi everyone. Having a circle, knowing its center and radius, how can I calculate the normal vector? I need more...
Oct23-10 04:34 PM
mathman
2 2,804
I am a student pursuing an associates degree in nanotechnology. I would greatly appreciate a chance to talk to a...
Oct23-10 03:27 PM
Kmenex
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Can the definition of a bijection be extended to three dimensions? So for example, f(a, b) = c, where f : N X N...
Oct22-10 05:09 PM
pinsky
2 1,218
Hi all, Can anyone show how I'd work out the analytical solution to an infinite series of this form: ...
Oct22-10 06:52 AM
arildno
2 1,265
Hello, this is my first post here so please be kind. I have had an idea of sorts ricocheting inside of my skull for...
Oct22-10 01:21 AM
3D_Mind
2 1,454
I got this out of An Imaginary Tale: The Story of Sqrt(-1). In section 1.5 of the book, the author explains that...
Oct21-10 09:57 AM
DoctorBinary
3 3,554
Hi, I am not a math person. I am terrible at math and have made it to college feeling like I have missed out on...
Oct21-10 05:14 AM
2rashmi1993
9 1,423
what is that latex font that screams "professional looking"? I am using math-type + power point's beamer-template...
Oct20-10 03:42 PM
Liji.h
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Hello, I have been an avid reader of the physics forum, and now I think I finally have something worth asking. The...
Oct20-10 11:43 AM
trambolin
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Hi there, A quick question concerning the FFT. Let's say I explicitly know a 2D function \tilde{f}\left(\xi_1,\xi_2...
Oct20-10 02:57 AM
CharlesMareau
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Heya's how would one go about spanning a vector say 'u' onto a plane spanned by vectors v1 and v2. I have a...
Oct19-10 11:11 PM
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4 24,151
Hi, I think I have been having this question for some time now. What is the difference between tensor calculus and...
Oct19-10 07:41 PM
slider142
2 1,849
Hello all: This may be the only question I ever ask here, so pardon if I posted in wrong forum. I work for Habitat...
Oct19-10 06:04 PM
turbo
8 799
Hello everyone, I have a quick theoretical question regarding probability. If you answer, I would appreciate it if...
Oct19-10 04:35 PM
Kreizhn
8 2,778
Hello; How do I solve an integral involving the dot product? For example, imagine I have two vectors A and B,...
Oct19-10 01:09 PM
HallsofIvy
5 1,432
Are lx3l or lxl3 polynomials? If not, what would be a good example of a cubic polynomial function (R \rightarrow R)...
Oct19-10 09:46 AM
HallsofIvy
1 6,688
1)In a hyperbola, x^2/a^2-y^2/b^2=1(standard form), b^2=a^2(e^2-1) This is in the case where b is greater than a....
Oct19-10 04:47 AM
sachin123
6 990
Dear all, I have a set of 5 non-linear equations with highly complicated and long forms for which I wish to find...
Oct18-10 01:49 PM
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I've been trying to plot the graph of y=x^(1/x). The positive values of x have been fine, but the negative values...
Oct18-10 08:12 AM
HallsofIvy
2 1,164
In my Questions I usually have to calculate the Centroid of a curve whose equation is given! I don't know the...
Oct18-10 07:50 AM
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6 5,212
I have a really bad math background, so sometimes I struggle with or am just a little slow with some algebraic things,...
Oct17-10 06:54 PM
LCKurtz
1 1,317
I am trying to do a simple calculation to figure out how much of a certain material must be added to another to...
Oct17-10 04:12 PM
Kmenex
0 601
We learned about cartesian coordinates briefly in class and i didnt completely understand them. Im not looking for an...
Oct17-10 03:56 PM
mathman
2 891
The quadratic formula is, as you are well aware: ax^2+bx+c=0 x=\frac{-b\pm\sqrt{b^2-4ac}}{2a} What is the cubic...
Oct17-10 03:05 PM
kennysmith39
6 2,092
If Fmag = q(v x B) and Felectric = qE, Florentz = q can I say that Florentz = Fmag + Felectric?
Oct17-10 10:00 AM
HallsofIvy
1 837
x^2*log(2)x=256^2 (2) refers to base 2 Is ther any rule to solve for x.
Oct17-10 06:38 AM
arildno
6 1,734
Ofcourse i know how to do vectors, but i have a question about multiple vectors. when the like vectors are provided...
Oct16-10 10:25 PM
jtbell
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