Jorge Fernández

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21866
bio website location Mexico City age member for 2 years, 6 months seen 4 mins ago profile views 1,988

Hello, I am a freshman at The National Autonomous University of Mexico (UNAM).

My interests are contest problems,elementary number theory, combinatorics, graph theory, linear algebra, group theory, abstract algebra and I have been meaning to learn category theory and matroids.

16,789 Reputation

80 today
 +35 15 hours ago 3 events A combinatorial proof of Wilson's Theorem +25 3 hours ago 2 events Question around the following relation: $T(n,1) = n$, for a positive integer $n$, and for all $k\geq 1,\ T(n,k+1)=n^{T(n,k)}$. +20 4 hours ago 2 events Lottery odds calculated in your head, or pen and paper.
55 yesterday
 +35 20:34 3 events Check if Sequence is Graphic: 8, 8, 7, 7, 6, 6, 4, 3, 2, 1, 1, 1 +10 05:28 upvote A Math book with an inspiring ethos? +5 06:10 upvote if there are 5 points on a sphere then 4 of them belong to a half-sphere. +5 05:33 upvote What is the best base to use?
253 2 days ago
 +55 01:22 5 events Triangle-free graph with 5 vertices +35 19:58 3 events Number of Terms in a Polynomial (4th Degree) +30 05:42 3 events $x^2-y^2=2s$, s cannot be an odd integer +25 20:24 2 events Number of edges in a graph with n vertices and k connected components +25 19:21 2 events Set of common representatives and pigeonhole principle in one problem +25 11:39 2 events Set with distinct subset sums +25 05:08 2 events Show that there are at least $2$ elements in $U(n)$ such that $x^2=1$. +20 15:23 2 events Finite non-abelian group $G$ containing a subgroup $H_0\neq\{e\}$ with property that $H_0\leq H$ for all subgroups $H\neq\{e\}$ +10 08:15 upvote Intersect of Stabilizers is a Normal Group +5 18:53 upvote difference between class, set , family and collection -2 17:55 downvote if $A$ and $B$ are subnormal, then $A\cap B$ is subnormal
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