Reputation
Next tag badge:
95/100 score
32/20 answers
Badges
2 41 82
Newest
 Enlightened
Impact
~566k people reached

10h
awarded  Enlightened
12h
awarded  Nice Answer
1d
answered How to show that $X^p-t\in\mathbb{F}_p(t)[x]$ is irreducible?
Apr
22
comment Are locally contractible spaces hereditarily paracompact?
@Henno Brandsma : Indeed, like I said I didn't believe that locally contractible implied hereditarily paracompact, but the book kind of put me in that situation. It clearly says "locally contractible topological space" and then refers to that result... what a pain.
Apr
21
comment Does this map define a rational map?
@B Dill : The map $x^5 - x^4 + 2x^2 - y^2$ is identically zero on $X$. Actually, all you need to show is that the set of points in $\mathbb A^2(\mathbb C)$ where $\phi$ is defined intersects $X$ in a non-empty set, so that the rational map is well-defined. I suggest you read up on your definitions, you sound confused!
Apr
21
comment Does this map define a rational map?
@B Dill : It's not "defined as a map" on $X$, as a map, it's only defined on an open subset. But this means it defines a rational map on $X$ by definition.
Apr
21
answered Does this map define a rational map?
Apr
21
comment Does this map define a rational map?
Does $X=A$? Because you didn't define $X$.
Apr
21
comment Are locally contractible spaces hereditarily paracompact?
@Sorry, there was some axiom assumed on the sheaf. I think everything should be well-edited now.
Apr
21
revised Are locally contractible spaces hereditarily paracompact?
added 14 characters in body; edited body; added 48 characters in body; deleted 14 characters in body
Apr
21
comment Are locally contractible spaces hereditarily paracompact?
Same question as the one I asked Captain Lama!
Apr
21
comment Are locally contractible spaces hereditarily paracompact?
Do you have an idea about what happened in the book? Thanks for bringing up the example though!
Apr
21
asked Are locally contractible spaces hereditarily paracompact?
Apr
21
comment $f(|z|)$ is not an analytic function
@Rick Sanchez : You can assume $g$ is holomorphic, which implies that $f$ is smooth by restricting $g$ to an open ray ; the above implies that $f$ is constant.
Apr
17
revised Show that among every consecutive 5 integers one is coprime to the others
added 5 characters in body
Apr
16
answered Show that among every consecutive 5 integers one is coprime to the others
Apr
16
answered How to define CW-complex structure on cubic surface in $CP^3$?
Apr
12
comment Little arithmetic step in a proof
This proof is very confusing to read. We don't know anything of the context and it looks like it is used a lot in the proof. Please include the full statement and proof.
Apr
2
accepted Exterior power “commutes” with direct sum
Mar
31
awarded  Enlightened