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comment Is a pushout of a closed immersion $f$ again a closed immersion?
This seems relevant: mathoverflow.net/questions/29306/…
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Jul
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comment Solving a Laplacian in polar coordinates
@Thomas I see what you mean though, this is a problem.
Jul
27
comment Solving a Laplacian in polar coordinates
@Thomas According to the author of the book, there is no typo. I copied it correctly.
Jul
27
asked Solving a Laplacian in polar coordinates
May
31
comment quasi-finite maps to quasi-projective varieties?
@MattE Yes, I was working in the algebraic category.
May
27
answered Open properties of quasi-compact schemes
May
25
answered quasi-finite maps to quasi-projective varieties?
May
24
answered How to find a finite set of generators for $I \subset k[x_1, …, x_n]$
May
23
answered Geometric genus of a (possibly non-complete) intersection in P^n
May
5
comment Kähler differentials not the same as regular differentials on a singular curve
@Alan I'm guessing it has something to do with $y^2=x^3$ implying $2ydy=3x^2 dx$. Multiplying by $x$ gives $2xydy=3x^3 dx=3y^2 dy$ and dividing by $y$ gives $2xdy=3ydx$.
Apr
28
answered Varieties given by non-algebraic equations