12,131 reputation
21752
bio website
location Monkey Island, OK
age
visits member for 2 years, 3 months
seen 4 hours ago

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.


Aug
1
comment Number of ways to select numbers, each 1 from different lists without repetition
This is going to be hard.
Aug
1
comment Find a group G such that Z(G/Z(G)) is nontrivial when Z(G) is the center of G.
meta.math.stackexchange.com/questions/5020/…
Jul
31
answered Can two cycles be the inverse of each other if they are disjoint?
Jul
31
comment Neither $\log x$ nor $\exp(x)$ are rational functions
I think it's a good excercise to try to see why. I can give an explanation if it is required.
Jul
30
answered Neither $\log x$ nor $\exp(x)$ are rational functions
Jul
30
comment How many graphs can have the same line graph?
Excelent, thank you very much. this is exactly what I was looking for.
Jul
30
accepted How many graphs can have the same line graph?
Jul
30
asked How many graphs can have the same line graph?
Jul
28
answered Choosing $2$ groups of $5$ members and $1$ group of $2$ members from $15$ person
Jul
28
comment Why is it that if I count years from 2011 to 2014 as intervals I get 3 years, but if I count each year separately I get 4 years?
Oh, I was just saying the flaw in the reasoning that he had worked in 2011,2012,2013,2014 because he hadn't in fact worked all of 2014.
Jul
27
answered Maximum possible parts of a cake if cut n times
Jul
27
answered Why is it that if I count years from 2011 to 2014 as intervals I get 3 years, but if I count each year separately I get 4 years?
Jul
25
awarded  Nice Answer
Jul
25
comment What's the name of this algebraic property?
well, in general groups don't need to be commutative, however this assumption is not required for the result to be true.
Jul
25
comment What's the name of this algebraic property?
$xh$ just means the group operator acting on the pair $(x,h)$ if the operation in the particular group is addition then $xh$ is just $x+h$. the plus sign is normally used for abelian groups. But this result generalizes to any group.
Jul
25
answered What's the name of this algebraic property?
Jul
25
comment Introduction and Prerequisites to Abstract Algebra
Maybe you where the one who was fast paced when reading it
Jul
25
answered Introduction and Prerequisites to Abstract Algebra
Jul
25
comment Polygons with equal area and perimeter but different number of sides?
In fact I am sure for any n<m and any n-gon we can find an m-gon with the same area and perimeter as the n-gon, but I can't prove this
Jul
25
answered Polygons with equal area and perimeter but different number of sides?