# Jorge Fernández

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bio website location Mexico City age member for 2 years, 5 months seen 5 hours ago profile views 1,802

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.

# 768 Posts

 18h asked Constructing a cyclic quadrilateral of given sides. 18h answered Determine the number of distinct labeling of $K_{r,r}$ 1d answered Coloring edges of $K_n$ so each vertex has $l$ edges of each color. Nov24 asked Coloring edges of $K_n$ so each vertex has $l$ edges of each color. Nov24 asked For what values of $l$ is $K_n$ the disjoint union of $l$-regular graphs? Nov23 answered Number of 8 character passwords including numbers and letters without repetition Nov21 answered Prove that the board contains a nontrivial rectangle. Nov21 answered How to prove this statement: $\binom{r}{r}+\binom{r+1}{r}+\cdots+\binom{n}{r}=\binom{n+1}{r+1}$ Nov20 answered Arrangements of $3n$ balls. Nov20 answered how many integers between one and 100000 have the sum equal to fifteen? Nov20 answered How many zeros does $f(x)= 3x^4 + x + 2$ have? Nov20 answered Number of Bit Strings with Five Zeros Nov20 answered Coloring 3 by 3 square such that every unit square has an even number of squares it shares a vertex with of the same color (including itself). Nov20 answered Probability that this stamp is one that you haven't seen before Nov20 answered Combinatorics question about choosing non consecutive integers Nov20 answered Combinatorics question about choosing non consecutive integers Nov17 answered Strategies for solving permutations of a word Nov17 answered Relationships between altitudes and medians of a triangle Nov16 answered proof of a useful counting result in group theory Nov15 answered Prove two subgroups have the same order given an equivalence relation.