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

Feb2313 09:24 AM
micromass

1 
30,417 
Hi there, this is my first post here so I'm sorry if this is in the wrong place, asked before, standard newbie...

Oct2011 06:12 PM
D H

34 
5,415 
I'm currently reading Durbin's Modern Algebra, and I have a question about the positive set in ordered integral...

Oct2011 04:56 PM
Erland

1 
1,275 
Hi,
I'm struggling with the following:
I have a colored graph, and I used Bliss to find the generators group for the...

Oct2011 01:19 PM
matt42

0 
635 
A few classmates and I need help with some proofs. Our test is in a few days, and we can't seem to figure out these...

Oct2011 08:16 AM
wisvuze

7 
2,633 
Why is it that a metric space (X,d) always has two clopen subsets; namely {0}, and X itself?
Rudin calls it...

Oct1911 10:19 PM
Deveno

3 
1,666 
I'm slightly confused about why complex numbers are required to find all n roots of a number. Is it specifically...

Oct1911 08:35 PM
tut_einstein

7 
2,580 
From Herstein's Abstract Algebra. Section 2.7 #7
If φ is a homomorphism of G onto G' and N ◅ G, show that φ(N)...

Oct1911 02:57 AM
Deveno

2 
1,053 
If anyone has any links to good introductory information about matrix completions, please post them here for me. ...

Oct1811 08:35 PM
shelovesmath

0 
488 
Hi guys!
I need to solve a matrix. I have 3 equations, 3 unknowns, straightforward stuff. And I know it's...

Oct1811 07:14 PM
jasonRF

3 
1,619 
Hello everyone,
I am currently taking an introductory course in linear algebra. I am begining to struggle with...

Oct1811 06:07 PM
mathwonk

1 
757 
Let F_n and F_n+1 be successive Fibonnaci numbers. Then (F_n+1)/(F_n)  Phi  < 1/(2(F_n)^2)
Where Phi is the...

Oct1811 03:14 PM
Matt Benesi

3 
1,707 
Hello everybody,
I would like to know if there are any techniques to handle illconditioned or/and singular...

Oct1811 05:26 AM
D H

1 
1,192 
Hello. I recall from Linear Algebra there being an ultrafast shortcut for finding the eigenvectors of a 2x2 matrix...

Oct1711 03:58 PM
wil3

0 
2,230 
How does knowing that two matrices anticommute AB=BA and that A^2=1 and B^2=1 help me to know how to find the trace...

Oct1711 01:38 PM
I like Serena

16 
2,675 
a,b,c,d\in\mathbb{R^{+}}\;\;,a+b+c+d=1.
Then prove that
\left(...

Oct1711 09:40 AM
wnvl

1 
1,247 
So I have 4 points, one of them has an unknown x coordinate. How would I show that they are coplanar? With 3 points I...

Oct1711 08:47 AM
AlephZero

5 
2,416 
Let F be a field. Let c \in F.
I am trying to show that if
c = f^2 where f\in F], then f\in F.
So I am...

Oct1611 07:59 PM
R.P.F.

1 
732 
I am puzzled by the following infinite product:
Let B > A
A  B = *
= * *
= * * *
etc.

Oct1611 05:30 PM
dodo

7 
1,711 
I need to show that addition and multiplication are welldefined in Z/nZ. So far, I've figured out that I need to work...

Oct1611 04:57 PM
Deveno

1 
1,784 
This thread is concerned with rectangular triangle with one side ( = s) and hypothenuse
(t = 2 s + 1) given and we...

Oct1511 10:40 PM
ramsey2879

7 
4,372 
Let n>2. Where n is integer show that sqrt(n!) is irrational.
I am supposed to use the Chebyshev theorem that for...

Oct1511 06:12 PM
ramsey2879

7 
2,730 
EQUALITY OF ROW AND COLUMN RANK (o'Neil's proof) Is there smt wrong?
...

Oct1411 06:05 PM
mathwonk

1 
1,232 
So, Google recently interviewed one of my friend as an employee candidate.
How many ways can a two by n rectangular...

Oct1411 04:32 PM
AlephZero

9 
2,421 
Now, I can show that if n is prime then Z/Zn is a field
a = a
b = an2
a*b = an1 = 1 (mod n) > Fermat's...

Oct1411 11:45 AM
General_Sax

3 
1,794 
How to calculate following integral?:
{lim}_{t→∞}\int_{0}^{t} \exp (A(ts)) B B^{T} \exp (A^{T}(ts))ds
where...

Oct1411 11:17 AM
lequan

0 
1,613 
Let Q be the quaternion group {1, 1, i, i, j, j, k, k}. Show that the normal subgroup {1, 1, i, i} is the kernal...

Oct1411 10:32 AM
demonelite123

9 
1,889 
While R^1, R^2, ... , R^n comes quite naturally, is it even conceivable to ponder the meaning of R^(n)? Is this...

Oct1411 05:55 AM
Deveno

7 
1,690 
Please I have a problem with natural log for group set as follow:
a*b=eln(a)*ln(b)
1 Show that the group law...

Oct1411 03:47 AM
naoufelabs

9 
2,142 
Any pro knows what is the main function of direct transient analysis, modal transient analysis, direct response...

Oct1311 09:33 PM
Kongys

0 
787 
Do any of you know how to find unit normal vector when you know three planes (given by eigenvectors of a 3x3 stress...

Oct1211 10:46 PM
scaykl

0 
901 
For any given quadratic surfaces equation
e.g ax^{2}+by^{2}+cz^{2}+ 2dxy + 2eyz + 2fxz = g,
where a,b,c,d,e,f...

Oct1211 09:47 PM
JamesGoh

0 
881 
1. The problem statement, all variables and given/known data
If I have some fraction, a/b, in Z subscript 5. (Z is...

Oct1211 11:55 AM
Deveno

6 
2,156 
Is there any standard (or reasonably standard) notation for the following function?
Basically, it's
∏(n) ...

Oct1211 01:12 AM
kenzidelx

0 
1,399 
I have almost no idea how to start! I'm just doing this problem for fun(or was at one time):
Find all a such that...

Oct1111 01:59 PM
Matt Benesi

10 
3,110 
I posted this question in the engineering section, but didn't get any replies there  hence posting it here.
Below...

Oct1111 11:18 AM
phiby

2 
747 
Ok, so I'm having difficulty adapting to subjects like set theory etc.
For example this question:
L.{A,a} = {A,...

Oct1011 04:44 PM
micromass

1 
1,234 
Hi,
I am trying to find the degree $.
Intuitively, I thought it will be 2? but cannot see that

Oct1011 04:12 PM
micromass

1 
1,438 
Here is a bilinear map φ of two vector spaces V₁ & V₂ into another vector space N with
respect to the bases B =...

Oct1011 12:23 PM
lavinia

3 
1,642 
I can find various derivations of ∫ dθ = 0 which are satisfactory, but none of ∫dθ θ =1.
Cheng and Li says it's...

Oct1011 11:18 AM
FJ Rolfes

2 
1,054 
Hello,
I have an unitary operator f, and another binary linear operator g.
I would like to find out a necessary...

Oct1011 09:48 AM
mnb96

2 
958 