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

Feb2313 09:24 AM
micromass

1 
35,941 
Hi,
I have found an encryption algorithm named ECKSPS (published in a paper named 'efficient conjunctive keyword...

Apr1013 03:13 AM
sanderpotter

0 
493 
Hello all,
I'm working through a majority of the problems in "A First Course in Wavelets with Fourier Analysis" and...

Apr1013 03:00 AM
Bacle2

4 
645 
Is there an easy way to see if a unitary group is cyclic? The unitary group U(n) is defined as follows...

Apr713 03:49 PM
Max.Planck

12 
2,035 
EDIT:( Sorry I meant for the title of this to say conjugacy classes of subgroups of Z X Z) I have a question.
I...

Apr713 11:11 AM
Bacle2

6 
1,218 
I was wondering if anyone has compiled a list of AA resources. Recently, I have found that I practically need to learn...

Apr613 03:22 PM
DeeAytch

2 
733 
I heard this assertion during a discussion:
If two matrices are similar, but one is symmetric and the other is not,...

Apr513 08:40 PM
namegoeshere

2 
652 
Is there a generalization for the Chinese Remainder Theorem if the modular bases are not coprime? Or even to some...

Apr513 08:53 AM
henpen

1 
2,395 
z = h(x) + ig(x)
True or False: By the definition of the complex plane, h(x) and ig(x) will always be orthogonal.
...

Apr413 08:44 PM
Bacle2

7 
1,232 
Can anybody explain me how did the author obtain the third line from the second in document 111.pdf?
In the second...

Apr413 11:42 AM
LayMuon

0 
655 
Hi everyone,
I am currently dealing with a nonlinear system of coupled equations. In fact I had performed a...

Apr313 03:56 AM
mfb

5 
888 
I have solutions for eigenvalues to be
λ1=i1 = √2 e^i(3∏/4) and
λ2=i+1 =√2 e^i(∏/4)
How do you go from the...

Apr213 03:50 PM
mathman

4 
755 
Let T be an operator on the vector space V and let λ1, ..... , λn be it's eigen values including multiplicity .
...

Apr213 12:23 PM
vish_maths

9 
1,142 
How come a square matrix has eigenvalues of 0 and the trace of the matrix?
Is there any other proof other than just...

Apr113 12:40 PM
jbunniii

3 
3,414 
Hey, just trying to get my head around the logic of this. I can see that if composition factors are cyclic then...

Mar3113 11:42 AM
TaliskerBA

0 
943 
Is there a general algorithm for taking the presentation of a group and get the permutation generators for the...

Mar3013 12:31 AM
spamiam

1 
825 
Hi,
My textbooks say that when a solution, x, is found to Ax=b it has a particular solution, x_0, such that A*x_0=b...

Mar2913 04:52 PM
engineer_ja

6 
1,383 
I have the following matrix inequality which is nonlinear due to M^TM. In order to transform into an LMI, I apply the...

Mar2913 05:50 AM
Ronaystein

0 
590 
I've been taught (in the context of SturmLiouville problems) that Fourier series can be explained using inner...

Mar2813 08:14 PM
strangerep

16 
3,208 
Can someone tell me why Sum from j=1 to 3 of y_j*(x'_j , x'_k) = (f , x_k) for 1<=k<=3
where (x1,x2) is the...

Mar2813 06:18 PM
ericm1234

0 
513 
Is the dual space a V* a sub set of V?

Mar2713 06:26 PM
MonicaRita

12 
924 
I saw a picture of what it might look like when I was researching it, but I'm confused about something. The picture's...

Mar2613 07:44 PM
LastTimelord

0 
523 
A forgetful functor ignores structure on a set (under an embedding interpretation) prior to its mapping to another...

Mar2613 04:38 PM
1Truthseeker

0 
707 
Hello All,
I was trying to prove that an operator T in a real vector space V has an upper block triangular matrix...

Mar2613 09:14 AM
vish_maths

0 
531 
basically i have a problem where i am rotating 1 vector to be parallel to another
i get the axis of rotation by the...

Mar2513 11:37 AM
Ben Niehoff

1 
639 
This is a problem that a few friends and I came up with while working on an extracurricular robotics project:
...

Mar2513 10:47 AM
Vargo

3 
899 
EDIT UPDATE
so basically I figured this out. it was apparently what i was rotating around.
Now i can rotate much...

Mar2513 03:10 AM
sparkzbarca

0 
586 
Suppose we have an nxn matrix A with column vectors v1,...,vn. A is invertible. With rank(A)=n. How do I prove that...

Mar2313 05:09 PM
AlephZero

4 
969 
I am curious on how the determinant function determines orientation? I read about in in one of Werner greubs books and...

Mar2313 02:10 PM
lavinia

6 
1,170 
I must apologize if this question sounds dump but if an isomorphism is established between two groups, is it true that...

Mar2313 02:07 PM
lavinia

4 
905 
There is a corollary in our textbook that states "Let G be a group of order 12 whose 3Sylow subgroups are not normal....

Mar2313 12:18 PM
wisvuze

1 
771 
I was a bit confused the last paragraph before "Corollary 4.6.4". It says that we have the isomorphism \alpha : Z_k...

Mar2313 08:21 AM
Artusartos

2 
824 
Hello,
I'm in an introductory course about quantum computing. My math experience is fairly solid, but not very...

Mar2213 08:01 PM
Ocifer

2 
614 
Good afternoon!
I am working on a problem, where I at some point have to find the intersection between a polytope...

Mar2213 05:16 AM
alsm

0 
547 
Let an,m be defined for the nonnegative integers n and m such that n ≥ m.
an,0 = 1
am,m = m!
an+1,m+1 = (m+1)...

Mar2113 10:13 AM
conquest

1 
734 
Hi everyone.
Is there any way to set demands on least square solutions?
I have an equation on the form Ax=b,...

Mar2113 07:59 AM
Marvin_MKII

4 
1,043 
I think this may be a simple yes or no question. I am currently reading a book Vector and Tensor Analysis by...

Mar2013 03:49 PM
atyy

4 
1,515 
Claim: If p \in R is irreducible and nonzero, then p is irreducible and prime in R
Proof: Let I be the ideal...

Mar2013 03:44 PM
jbunniii

1 
622 
it seems to have many different ways to express a determinant, when we are using indices to write vectors and tensors,...

Mar1913 11:45 PM
chiro

1 
595 
Hello! If anybody has a minute, I'd appreciate a quick lookthrough of my proof that a finite abelian group can be...

Mar1813 02:37 AM
jbunniii

4 
980 
Let A be any real invertible matrix. There exists a nonzero diagonal matrix D such that A^T D A=D.
I'm pretty sure...

Mar1613 12:52 AM
fzero

8 
1,589 