12,723 reputation
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location Monkey Island, OK
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visits member for 2 years, 4 months
seen 3 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.


Oct
22
answered Prove that $ |A∪B|=|A|+|B|-|A∩B|$
Oct
22
answered between what two disjoint sections we can do a Union in order to get this group of solutions?
Oct
22
comment Normalizer and centralizer are equivalent when $p$ is the smallest prime dividing $|G|$
Where did you find this problem?
Oct
20
accepted can we have $gHg^{-1}\subsetneq H$?
Oct
20
asked can we have $gHg^{-1}\subsetneq H$?
Oct
19
comment Set of numbers which can not be represent as $a_1^n+a_2^n+…a_n^n$
Interesting question, I would say it is infinite for all $n\geq 2$
Oct
19
comment Math for Computer Science
glad I could help
Oct
19
comment $H\trianglelefteq A$ and $K\trianglelefteq B\Rightarrow HK\trianglelefteq AB$?
In other words, if this was true all subgroups would be norma
Oct
19
revised $H\trianglelefteq A$ and $K\trianglelefteq B\Rightarrow HK\trianglelefteq AB$?
added 19 characters in body
Oct
19
answered $H\trianglelefteq A$ and $K\trianglelefteq B\Rightarrow HK\trianglelefteq AB$?
Oct
19
answered Math for Computer Science
Oct
19
answered Can a relation be a partial order and an equivalence at the same time?
Oct
19
revised What will be nth term of the following sequence?
deleted 30 characters in body
Oct
19
answered What will be nth term of the following sequence?
Oct
18
comment Stuck with modular arithmetic problem using multiplication property
what you did was right, but you're assuming you have an if and only if. clearly $3n$ is always $0$ mod 3, so you can't conclude absolutely anything about $n$ from that fact
Oct
18
answered Prove that the union of two bounded set in a metric space is bounded.
Oct
18
answered Find a non-trivial semidirect decomposition of the following groups
Oct
18
answered How to prove that $\gcd(2n+3, 3n+1)$ divides $7$?
Oct
18
comment Probability of getting 3 cards in the same suit from a deck
you're very welcome, glad I could help
Oct
18
comment Probability of getting 3 cards in the same suit from a deck
It is what is called a binomial coefficient In some schools they write is as $12C3$ instead of $\binom{12}{3}$ In the calculator it is the button that has a symbol $nCm$. $\binom{12}{3}$ is the number of subsets of three elements a set of $12$ elements has. It is also said to be the number of ways to select three things out of 12 options when the order "doesn't matter"