426 reputation
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age 21
visits member for 1 year, 10 months
seen 10 hours ago

Jul
14
asked Exceptional locus of birational morphism is a divisor.
Jul
2
awarded  Curious
Jun
26
revised The Picard group doesn't change if we add the affine line
Changed x's for \times
Jun
26
suggested suggested edit on The Picard group doesn't change if we add the affine line
Apr
13
comment Let $A$, $B$ be subsets of $S^n, n≥2$. Show that if $A$ and $B$ are closed, disjoint, and neither separates $S^n$, then…
I don´t think I'm using reduced homology in any part, the Mayer-Vietoris sequence is for the unreduced case.
Apr
13
answered Let $A$, $B$ be subsets of $S^n, n≥2$. Show that if $A$ and $B$ are closed, disjoint, and neither separates $S^n$, then…
Apr
11
answered Simple exercise in cohomology
Apr
10
awarded  Revival
Apr
5
revised Principal divisors
Fixed typos
Apr
5
suggested suggested edit on Principal divisors
Jan
20
revised twisting sheaf on projective space
fixed notation
Jan
18
comment Question from Liu, Chapter 5 Ex 1.16
You can find the proof of Benja's assertion on Harshtorne's Chapter II Section V.
Jan
18
revised Yoneda's lemma to prove $f^*(\tilde M) \cong \widetilde{B\otimes _A M}$
grammar and notation
Jan
18
suggested suggested edit on Yoneda's lemma to prove $f^*(\tilde M) \cong \widetilde{B\otimes _A M}$
Jan
17
answered twisting sheaf on projective space
Jan
8
asked Does 2 manifolds can be “isotoped away”?
Dec
6
awarded  Excavator
Dec
6
revised Ambient Isotopy
fixed name of author
Dec
6
suggested suggested edit on Ambient Isotopy
Dec
5
answered prove that $|G|$ is even if $g=g^{-1} $, for all $g \in G$