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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.
Aug5-14 02:05 PM fredoniahead 
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All math courses. PDFs, tutorials and web links.
Aug13-14 05:16 PM seouldavid 
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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
1 38,821
given that a=(6.0+/-0.1) and b=(17.5+/-0.3) what is 2a^2 + b^2 i'm having so much trouble with this i think we...
Sep20-07 12:14 PM
6 3,005
Sorry, i have problem in this question which comes from my textbook. I couldn't solve it and i would like someone to...
Sep20-07 02:43 AM
3 1,787
I've been thinking about this for a bit and I was wondering how one would go proving the irrationality of an...
Sep20-07 01:18 AM
6 1,549
Laydies and Gents can anyone help me here? suppose there are well known formulas for this. That is, contact...
Sep19-07 07:03 PM
6 5,924
I'm reading the wikipedia article on them and I can't really get an understanding of what they are. I'm writing a...
Sep19-07 05:14 PM
3 2,249
Hopefully this isn't a foolish question but, I am up to CalcII and am anxious to apply what I've learned but have...
Sep19-07 03:56 PM
5 1,424
i know theres a science book review subforum but i figured this wouldn't get much attention there as it's a math book....
Sep19-07 02:27 PM
0 1,112
Im In a 1st Year University math class and its been a while since i did this stuff and cant remember if im doing this...
Sep19-07 11:38 AM
2 1,319
In Munkres' Topology he defines a Cartesian product AxB to be all (a,b) such that a is in A and b is in B. He says...
Sep19-07 11:12 AM
3 2,233
I was just wondering if you could write a functions domain and range with a set? Would it be something like D:...
Sep19-07 07:38 AM
5 11,281
Since the positive reals aren't denumerable (or so do I read) and the positive rationals are, then that must mean the...
Sep19-07 06:40 AM
19 2,967
A surveyor stands on flat ground at an unknown distance from a tall building. She measures the angle from the...
Sep19-07 06:31 AM
1 1,784
my teacher told me to think about this and i don't seem to get it. given vectors X,Y,& Z; is there geometric...
Sep19-07 05:57 AM
15 2,120
is there a fuzzy number theory, u know on the lines of the normal number theory??? could someone pls tell me abt any...
Sep19-07 01:09 AM
1 2,024
I am trying to derive this identity but cant seem to get anywhere: ...
Sep19-07 12:05 AM
0 2,604
Hello. As some of you know I'm a chemistry student, but I plan to take some math for the hell of it next summer. ...
Sep18-07 10:30 PM
2 1,596
I have a question that says: prepare a table of values and plot the graph for the domain (-pie,pie) for the function...
Sep18-07 07:56 PM
Math Jeans
2 3,146
In Rudin's Principles of Mathematical Analysis, 3rd ed., I encountered the following on p. 10, and I'm not really sure...
Sep18-07 07:30 PM
2 1,152
There are in fact many "information theories". Broadly speaking all of these actually define a notion of...
Sep18-07 03:13 PM
Chris Hillman
13 6,228
well i am having trouble understanding why we need the axiom of choice. So could anybody post here some problems, and...
Sep18-07 02:14 PM
9 3,160
Hi all, Can I know if there's an algorithm to find overlapping area(shadded red) of two triangles?(Please see...
Sep18-07 09:44 AM
0 2,716
I'm trying to create a formula from unit circle to square centered at origin with side length 2. The formula I have...
Sep17-07 09:40 PM
0 4,035
Hi all Just wondering if someone could help me out this... I have two loans of differing amounts and interest...
Sep17-07 03:52 PM
2 1,096
How do I find the sup of rationals (p/q, where q is even) that is less than sqrt(10)? gcd(p,q)=1
Sep17-07 09:45 AM
13 2,052
I have a solution for a PDE U(x,t)=y^2e^{-3x} + h(x) Where h(x) is any function such that h(0) = 1 What...
Sep16-07 10:22 AM
11 3,586
suppose a curve is not uniformly curved and i would like to describe how "curvy" a segment of this curve is? how would...
Sep16-07 06:37 AM
7 2,629
I'm having trouble relating the cross product form |a||b|sin(theta) to its component form (a1b2 - a2b1) ... and so...
Sep15-07 01:18 PM
8 2,124
I wrote my own graphing software, and I thought it had a bug in it, because when I graphed x^x, the curve starts out...
Sep15-07 11:08 AM
17 2,951
one of my cousins asked me what the mathematical logic/mathematical explanation are behind the definitions of scalar...
Sep15-07 10:31 AM
9 1,242
hey, i'm a newbie in this field.....just know how to add, subtract, multiply, and divide fuzzy numbers.... but want to...
Sep15-07 12:57 AM
3 2,890 Looking at the figure makes me...
Sep15-07 12:42 AM
10 1,751
Hello everyone im' stuck on this problem. It says: Each symbol in braille code is represened by a rectangular...
Sep14-07 06:40 PM
2 1,589
\frac 1{3x^2-x-2}<0 I understand that in algebra inequalities, one side has to be made zero but in the equation...
Sep14-07 04:03 PM
9 1,451
I'm having a little difficulty understanding Epsilon in the definition of convergence. From what the book says it is...
Sep13-07 10:18 PM
4 3,190
if the polynomial x^3+3x^2+9x+3 is a factor of x^4+4x^3+6Px^2+4Qx + R, what is R(P+Q)?
Sep13-07 11:55 AM
10 1,737
if two rational numbers added together is still rational then wouldn't an infinite sume of rational numbers that...
Sep13-07 09:43 AM
7 7,390
Well I came across this when someone asked me this question: (-2)^n = 16 I can clearly see n=4. However, he did...
Sep13-07 04:57 AM
5 20,665
x^{5}=5y^{3}-4z y^{5}=5z^{3}-4x z^{5}=5x^{3}-4y We get five solutions (0,1,-1,2,-2) for x=y=z. But it's hard to...
Sep12-07 05:35 PM
8 2,495
I am looking for any textbooks that closely resemble "Elements of Modern Algebra" by Gilbert & Gilbert both in its...
Sep12-07 05:30 PM
0 893
Hi I have some questions. If you're doing a MacLaurin expansion on a function say sinx or whatever, if you take an...
Sep12-07 08:41 AM
1 1,875

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