16,684 reputation
21866
bio website
location Mexico City
age
visits member for 2 years, 6 months
seen 17 mins 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.


22h
reviewed Leave Open For $E \subset \mathbb{R}$ and $\epsilon >0$, $\exists$ $(a,b)$ s.t. $\theta(E \cap (a,b)) \geq (1-\epsilon)|b-a|$ ($\theta$ Lesbegue Outer Measure)
22h
reviewed Close Why field of fractions of $k[x_1,x_2,…]$ is Noetherian?
22h
reviewed Close can someone help me with method of characteristics please
Dec
14
reviewed Approve Simplifying Permutations
Nov
20
reviewed Approve How many zeros does $f(x)= 3x^4 + x + 2 $ have?
Nov
8
reviewed Approve Proof $(1+1/n)^n$ is an increasing sequence
Nov
7
reviewed Approve Subgroup of prime order which is normal
Nov
2
reviewed Approve How many people play basketball?
Oct
14
reviewed No Action Needed Are fiber products in the category of locally ringed spaces always fiber products in the category of schemes?
Jun
19
reviewed Reject Idempotent operators over the exterior algebra
Jun
2
reviewed Approve Creating groups with 10 men and 10 women.
Jun
1
reviewed Approve applications of the identity $ab + \left(\frac{a+b}{2} - b\right)^2 = \left(\frac{a+b}{2}\right)^2$
May
19
reviewed Approve Evaluate $\displaystyle\int{\frac{e^{2x}} {\sqrt{1-e^x}}}\ dx$
May
4
reviewed Approve GCD and LCM Problem
May
3
reviewed Approve Inverse of this $3$-by-$3$ matrix using the Cayley–Hamilton theorem
Apr
30
reviewed Approve The Deck of cards!
Apr
28
reviewed Approve Global Dimension 1, right annihilator
Apr
25
reviewed Approve Quick Modular Property Help
Apr
7
reviewed Approve Exponential and Logarithmic Functions - $\log_2(x^2-4x-28)= 2$
Apr
1
reviewed Approve Need to get X by itself, have to rationalize the denominator