Johannes
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 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 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.