Mariano Suárez-Alvarez
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May
16
answered Why the Petersen graph is edge transitive
May
16
comment Why the Petersen graph is edge transitive
No. ${}{}{}{}{}$
May
15
comment Online primitive root modulo n list or tool?
What would be useful to anyone is to learn tto write the 3 or 4 lines needed to compute this oneself, really...
May
15
comment Why does $tr({A^*}A) = \sum\limits_{i = 1}^n {{\sigma _i}^2} $?
They are the square roots of those eigevalues (as that same page makes clear)
May
15
comment Prove $Inn(G)$ is a normal subgroup of $Aut(G)$
$Aut(G)/Inn(G)$ is in general not isomorphic to $G/Z(G)$. For example, if the group is abelian, $Inn(G)$ is trivial and $Aut(G)$ is usually not rivial, yet $G/Z(G)$ is trivial; for a concrete example, consider $G=\mathbb Z/2\mathbb Z\oplus\mathbb Z/2\mathbb Z$.
May
15
revised Why does $tr({A^*}A) = \sum\limits_{i = 1}^n {{\sigma _i}^2} $?
added 1 character in body
May
15
comment Why does $tr({A^*}A) = \sum\limits_{i = 1}^n {{\sigma _i}^2} $?
Notice that your last claim is not correct...
May
15
comment Online primitive root modulo n list or tool?
If $r$ is a primitive root for $n$, then all the others are the numbers $r^i$ with $i$ coprime to $\phi(n)$. Just compute the powers...
May
15
answered Why does $tr({A^*}A) = \sum\limits_{i = 1}^n {{\sigma _i}^2} $?
May
15
revised Online primitive root modulo n list or tool?
added 1532 characters in body
May
15
comment Online primitive root modulo n list or tool?
If you want more, give me your email and I'll send you a longer list.
May
15
answered Online primitive root modulo n list or tool?
May
15
comment Online primitive root modulo n list or tool?
You can say «primitiveroot 7919» to Wolfram Alpha, as in wolframalpha.com/input/?i=primitiveroot+7919
May
13
comment Why can't Eisenstein Criterion be used for certain polynomials (to show that it's irreducible over $\mathbb{Q}$)?
Your cuestión is a bit weird: Eisenstein's criterion cannot be applied to that polynomial simply because there is no prime for which the required condition is satisfied.
May
13
comment Matrices and Combinatorics are a bad combination.
Well, trust me. There is a difference. Before, you defined a set —the set of symmetric matrices of zeroes and ones— and then made a claim about its elements (which was false). As it stands now, the definition of the set includes two conditions.
May
13
comment Matrices and Combinatorics are a bad combination.
Your edit did not make things better, really.
May
13
revised Matrices and Combinatorics are a bad combination.
deleted 19 characters in body
May
13
revised Matrices and Combinatorics are a bad combination.
added 33 characters in body
May
13
comment Matrices and Combinatorics are a bad combination.
It is a problem, because the definition of the set $\mathcal A$ you gave is not tthe one you meant. You are th one interested in getting an answer, so it is you you should strive to be as clear as possible. Remember that it is you who is asking for help here...
May
13
comment Matrices and Combinatorics are a bad combination.
Maybe you did not understand what I wrote?