92,435 reputation
581169
bio website von-eitzen.de/math/tntrep.xml
location Bonn, Germany
age 48
visits member for 1 year, 7 months
seen 9 hours ago

I did study math and had a knack for it, but I am sooo out of that business now ...


Jul
7
answered How to prove $4^n+1$ is prime number if $3^{\frac{q-1}{2}} \equiv-1 \mod q$?
Jul
7
answered Why is the Jacobi symbol $(D/m) = (D/n)$ for certain $m,n,D$?
Jul
7
answered How to calculate $\cos(6^\circ)$?
Jul
7
comment Are two matrices of the same rank similar?
$\begin{pmatrix}1&0\\0&1\end{pmatrix}$ and $\begin{pmatrix}2&0\\0&2\end{pmatrix}$ are not similar.
Jul
7
revised Why is the Jacobi symbol in this setting a unique homomorphism?
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Jul
7
revised Why is the Jacobi symbol in this setting a unique homomorphism?
added 785 characters in body
Jul
7
answered Why is the Jacobi symbol in this setting a unique homomorphism?
Jul
7
reviewed Reviewed Bounds on a mapping from unit disc to left half plane
Jul
7
comment Which function is appropriate for the geometrical shape mostly used as LOVE symbol
Somehow related: math.stackexchange.com/questions/54506/…
Jul
7
answered Riemann sums with limits
Jul
7
comment Is there any field of characteristic two that is not $\mathbb{Z}/2\mathbb{Z}$
@ChrisEagle Tsk, tsk, shame on him. :)
Jul
7
comment Prove that $m^{2013}-m^{20}+m^{13}-2013$ has at least $N$ prime divisors
I now reworded everything in such a manner that it is not even necessary to find th eprime factorization of 2013. Also I used $p$-adic valuations instead of distinguishing cases $p|2013$ vs. $p\not|2013$, and hope this does in fact make the proof easier understandable (and how the problem can be generalized).
Jul
7
revised Prove that $m^{2013}-m^{20}+m^{13}-2013$ has at least $N$ prime divisors
Reworded using valuations, a different contradiction and avoided the prime factorization of 2013
Jul
7
comment Prove that $m^{2013}-m^{20}+m^{13}-2013$ has at least $N$ prime divisors
Why the downvote?
Jul
7
revised Prove that $m^{2013}-m^{20}+m^{13}-2013$ has at least $N$ prime divisors
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Jul
7
comment Prove that $m^{2013}-m^{20}+m^{13}-2013$ has at least $N$ prime divisors
@math110 Where did I lose you specifically?
Jul
7
comment Is there any field of characteristic two that is not $\mathbb{Z}/2\mathbb{Z}$
You may not have expected so while asking the question, but as a matter of fact the tag (finite-fields) does not fully apply as there are infinite fields of charateristic $2$ (as per Asaf's and Chris's answers)
Jul
7
comment Finding the rank of the word MOTHER
What is a positive word?
Jul
7
comment Prove that $m^{2013}-m^{20}+m^{13}-2013$ has at least $N$ prime divisors
@Rohinb97 non sequitur, even if $1$ were prime.
Jul
7
revised Prove that $m^{2013}-m^{20}+m^{13}-2013$ has at least $N$ prime divisors
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