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14h
asked What are some examples of principal, proper ideals that have height at least $2$?
2d
comment Inclusion of quotient sheaves restricted to open subset
@MisjaSteinmetz You're very welcome. Are you revising for part III algebraic geometry by any chance? If so I'd probably suggest steering clear of Kempf, I found it to be very unclear. I think Wilson's online notes were better, although I think he skips over a lot of steps (but not nearly so many as Kempf!).
2d
answered Inclusion of quotient sheaves restricted to open subset
Apr
18
revised What is the class group of the complement of three lines in the projective plane?
Improved spelling and grammar.
Apr
18
answered Taking module sheaf commutes with tensor product
Apr
5
answered morphism from a local ring of a scheme to the scheme
Mar
25
reviewed Reject second order linear differential equation with variable coefficients
Mar
25
comment Showing closed immersions are stable under base extension without using that they are affine.
@TakumiMurayama Thanks for the link, but yes, I would prefer an elementary answer. I think that your answer was good, but it did ultimately end up using $3.11 b)$, which I wanted to avoid. This is why I was badgering you so much about it, because you didn't explicitly mention that part of the question in your pre-edit answer so I had hoped that you had found a way around it.
Mar
25
reviewed Close Show a binary code does not exist.
Mar
25
reviewed Close Homotopy split monomorphisms
Mar
25
reviewed Leave Open Finding length of side on parallelogram
Mar
25
reviewed Leave Open Implicit differentiation q
Mar
25
reviewed Close For what $n$ does $[\log_21]+[\log_22]+[\log_23]+\dotsb+[\log_2n] = 1538$?
Mar
25
reviewed Close PigeonHole Principle - Question
Mar
25
reviewed Leave Open translating one sentence to FOL , an interview question is wrong !?
Mar
25
awarded  Promoter
Mar
22
reviewed Leave Open Differentiate.$ y = \frac{7x}{ 6 − \cot x}$
Mar
22
reviewed Leave Open Proving independency of two random variables
Mar
22
reviewed Leave Open Probability of finding one card out of 5
Mar
22
reviewed Leave Open Writing an abstract for a conference