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Oct
19
asked Prove equivalence of conditions for a tree
Oct
3
accepted Ignoring $\max$ for discrete random variables
Oct
3
asked Ignoring $\max$ for discrete random variables
Sep
5
answered Is $[0,4,4]^T$ in the plane in $\mathbb{R}^3$ spanned by the columns of $A$?
Sep
4
awarded  Teacher
Sep
4
answered Is the cycle graph $C_n$ defined only for $n \ge 3$?
Sep
4
comment 3rd roots of unity as eigenvectors
Thanks for your efforts - just because of this I will accept your answer as it is now complete with both descriptions!
Sep
4
accepted 3rd roots of unity as eigenvectors
Sep
4
comment 3rd roots of unity as eigenvectors
I tried it now a few times and fail though I do use your suggested relations. My current matrix looks like $((1,0,0)^T,(1+\zeta^2,1,0)^T,(0,1+\zeta^2,-2\zeta-\zeta^2)^T)$. I assume that the rank should be 2 and therefore at least my last line is wrong :/
Sep
4
comment 3rd roots of unity as eigenvectors
I got used to write $z$ and $\lambda$ for the variable of my characteristic polynomials so I just didn't change anything to be at least consistent with my notation, thanks for the hint though :)
Sep
4
comment 3rd roots of unity as eigenvectors
I am trying to solve it with the general approach as we both mentioned but I get horrible results - is there any way I could persuade you to show me how to use the kernel approach in this particular case?
Sep
4
asked 3rd roots of unity as eigenvectors
Sep
3
accepted Subspaces $\mathcal{C_k}\subset(\mathbb{Z}/2\mathbb{Z})^3$ with $\dim(\mathcal{C_k})=2$
Sep
2
asked Subspaces $\mathcal{C_k}\subset(\mathbb{Z}/2\mathbb{Z})^3$ with $\dim(\mathcal{C_k})=2$
Aug
23
accepted Dimensions of symmetric and skew-symmetric matrices
Aug
23
comment Dimensions of symmetric and skew-symmetric matrices
@RijulSaini: Thanks, but enzotib's answer seems to be easier to understand!
Aug
23
comment Dimensions of symmetric and skew-symmetric matrices
But this is no explanation why the symmetric matrices have the specified $\dim$.
Aug
23
comment Dimensions of symmetric and skew-symmetric matrices
I did edit it - thanks for the reminder!
Aug
23
revised Dimensions of symmetric and skew-symmetric matrices
added 45 characters in body; edited title
Aug
23
asked Dimensions of symmetric and skew-symmetric matrices