11,810 reputation
21650
bio website
location Monkey Island, OK
age
visits member for 2 years, 2 months
seen 10 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
17
awarded  Nice Question
Aug
17
accepted Joke explanation: “a comathematician is a device for turning cotheorems into ffee”
Aug
16
revised Joke explanation: “a comathematician is a device for turning cotheorems into ffee”
edited tags; edited tags
Aug
16
asked Joke explanation: “a comathematician is a device for turning cotheorems into ffee”
Aug
10
answered Number of ways in which $2010$ can be formed using $2,5,10$.
Aug
10
comment Number of ways in which $2010$ can be formed using $2,5,10$.
what is a dp method?
Aug
10
comment combinatorics board with digits neat problem
very good, I personally wasn't able to solve it, had you seen this problem before?
Aug
10
accepted combinatorics board with digits neat problem
Aug
10
awarded  Socratic
Aug
9
asked combinatorics board with digits neat problem
Aug
9
answered Probability problem from FELLER'S book
Aug
9
accepted group-like structure texts.
Aug
8
comment group-like structure texts.
I think I read somewehere that you don't even need the unicity of the cancelation i.e. if $S$ is a semigroup under composition such that for all $a,b,c,d$ we have $ax=b$ and $yc=d$ have solutions then $S$ is a group.
Aug
8
comment group-like structure texts.
is that false? I thought since there is an identity and cancelation then for each a the equation xa=e must have a solution and the equation ax=e also, so it has a left and a right inverse, and if it has a left and right inverse they must be equal. Is this wrong?
Aug
8
asked group-like structure texts.
Aug
7
comment Odd town Even town explanation.
ok, I think I got it, but just to make sure, When taking the dot product all of the operations happen in $\mathbb F_2$ right?
Aug
7
accepted Odd town Even town explanation.
Aug
7
revised Odd town Even town explanation.
added 34 characters in body
Aug
7
asked Odd town Even town explanation.
Aug
5
awarded  Good Question