2,181 reputation
839
bio website
location Santiago, Chile
age 24
visits member for 2 years, 8 months
seen 1 hour ago

I'm an undegraduate math student in Pontificia Universidad Católica de Chile.


17h
comment Does presheaf send the empty set to zero?
A functor in the generic case does not preserve initial objects. I think one needs to define a sheaf as a contravariant functor which sends the empty set in a trivial group.
1d
asked Universal property of sheafification
1d
comment Does presheaf send the empty set to zero?
Why F must preserve the terminal object?, F is just a contravariant functor.
1d
reviewed Approve Show that this equation together with the boundary conditions $u(0) = 2, u(\pi) = 0$ has no solution
Jan
4
comment Is $B = \{x:x \notin B\}$ a valid paradox in Naive Set Theory?
oops youre right
Jan
4
revised Is $B = \{x:x \notin B\}$ a valid paradox in Naive Set Theory?
edited body
Jan
3
comment Is $B = \{x:x \notin B\}$ a valid paradox in Naive Set Theory?
Why $B = \{x:x \notin B\}$? Did you mean $B^c$?
Dec
10
awarded  Caucus
Nov
29
reviewed Approve Basic problem in Mechanics
Nov
24
reviewed Approve Solve: $\sin x - y\cos x = z$ for $x$.
Nov
20
reviewed Approve Functions of sets
Nov
19
reviewed Approve Inclusion-Exclusion Question.
Nov
16
reviewed Approve How do I plot normal distribution
Nov
12
answered Field extensions and minimal polynomial
Nov
5
comment Complex Analysis Book
@BhaskarVashishth No, only in portuguese. But you can read "courant and john introduction to calculus and analysis" it is excellent and it is very similar to lima.
Nov
3
awarded  Popular Question
Nov
2
reviewed Approve On a $p$-adic unit and the existence of its $n$-th root
Nov
2
reviewed Approve Integrating $\sin(y^2)$
Nov
2
awarded  Custodian
Nov
2
reviewed Close A question about prime and factorization