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 Apr8 answered local homology group Apr6 answered Show that degree of constant map is zero Apr6 answered Simplicial homology for n-simplex Oct29 awarded Yearling Oct26 revised Exceptional locus of birational morphism is a divisor. deleted 27 characters in body Jul14 asked Exceptional locus of birational morphism is a divisor. Jul2 awarded Curious Jun26 revised The Picard group doesn't change if we add the affine line Changed x's for \times Jun26 suggested approved edit on The Picard group doesn't change if we add the affine line Apr13 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. Apr13 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… Apr11 answered Simple exercise in cohomology Apr10 awarded Revival Apr5 revised Principal divisors Fixed typos Apr5 suggested approved edit on Principal divisors Jan20 revised twisting sheaf on projective space fixed notation Jan18 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. Jan18 revised Yoneda's lemma to prove $f^*(\tilde M) \cong \widetilde{B\otimes _A M}$ grammar and notation Jan18 suggested approved edit on Yoneda's lemma to prove $f^*(\tilde M) \cong \widetilde{B\otimes _A M}$ Jan17 answered twisting sheaf on projective space