Jorge Fernández

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bio website location Mexico City age member for 2 years, 6 months seen 17 hours ago profile views 1,980

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.

492 Revisions

 17h revised Number of edges in a graph with n vertices and k connected components added 3 characters in body 18h revised Number of Terms in a Polynomial (4th Degree) added 33 characters in body 22h revised if $A$ and $B$ are subnormal, then $A\cap B$ is subnormal added 218 characters in body 22h revised Finite non-abelian group $G$ containing a subgroup $H_0\neq\{e\}$ with property that $H_0\leq H$ for all subgroups $H\neq\{e\}$ added 92 characters in body 1d revised elementary topology exercises reference edited body 1d revised $x^2-y^2=2s$, s cannot be an odd integer added 2 characters in body; edited title 1d revised Number of ways to arrange items added 116 characters in body 1d revised Number of ways to arrange items deleted 16 characters in body 1d revised Number of ways to arrange items added 20 characters in body 1d revised Number of ways to arrange items added 2 characters in body 1d revised How to solve this kind of problem? added 267 characters in body 1d revised Is it possible to permute an unknown binary sequence so that two particular bits are equal? added 886 characters in body 2d revised Is it possible to permute an unknown binary sequence so that two particular bits are equal? added 98 characters in body 2d revised Is it possible to permute an unknown binary sequence so that two particular bits are equal? added 59 characters in body 2d revised Relation Proofs on finite set added 211 characters in body 2d revised Infinite Set Proof (Countable and Uncountable ) deleted 1 character in body Dec17 revised Automorphism that is an Involution of a finite group added 15 characters in body Dec17 revised Factorial inequality $2!\,4!\,6!\cdots (2n)!\geq\left((n+1)!\right)^n$ using induction added 135 characters in body Dec17 revised How many “good” graphs of size $n$ are there? added 1 character in body Dec17 revised How do I prove that for any set $A$, $|A| < |\mathbb{N}|$ implies that $A$ is finite? edited body