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seen Aug 7 '13 at 17:44

Jul
2
awarded  Curious
Jul
30
revised Cholesky/LU decomposition from matrix and its inverse?
Added 'inverse' tag.
Jul
28
comment Cholesky/LU decomposition from matrix and its inverse?
Thanks so far. I don't want to accept it yet, but I upvoted it because it shows the difficulty.
Jul
25
asked Cholesky/LU decomposition from matrix and its inverse?
Jun
3
accepted What is the error in Newton's Method for Matrix Inversion?
May
9
awarded  Tumbleweed
May
2
revised What is the error in Newton's Method for Matrix Inversion?
edited tags
May
2
asked What is the error in Newton's Method for Matrix Inversion?
Dec
13
asked Different elliptic curves over given $\mathbb{F}_q$ can have different orders?
Sep
21
awarded  Custodian
Sep
7
comment Storing a group in a computer
I am interested in easifying equations, such as: Given a Group $G$, what is $a+a$ for $a \in G$? It is $2a$. The question is: How to store $G$ herefore.
Sep
7
comment Storing a group in a computer
Maybe it's not necessary to store the generating system... Maybe there's another way to "store" a group?
Sep
7
comment Storing a group in a computer
They were both new to me, thanks! But what about non finite generated groups?
Sep
7
asked Storing a group in a computer
Sep
2
awarded  Commentator
Sep
2
comment Transforming root-equations into polynomials
Oh, also: May I assume that instead of calculating $a-b=0$, calculating $a^n-b^n$ for arbitrary $n \in \mathbb{N}$ is equivalent? That way I could finally transform every sum of $n$th roots into a root-less sum?
Sep
2
comment Transforming root-equations into polynomials
Cool, I think that solves the first two questions. Indeed, for $3$rd roots, it should work, too! Now I am not completely sure about which X must be excluded from the domain (3rd point on my list...). For $(\sqrt{X}+(X+1))$, I only need to check that solutions are no roots of $(\sqrt{X}-(X+1))$. Which I could do by just putting them into $(\sqrt{X}-(X+1))$. Correct?
Sep
2
revised Transforming root-equations into polynomials
added 22 characters in body
Sep
2
reviewed Approve suggested edit on Transforming root-equations into polynomials
Sep
2
comment Transforming root-equations into polynomials
Thanks, but I was aware of Abel-Ruffini. I only want to turn the special polynomial into a normal polynomial. Then, I hope that I can solve it. But my question is only about the transformation.