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2d
revised Projection is an open map
cosmetics
2d
comment Projection is an open map
@GFR: True & done. Thanks for the comment btw, I realize now that tomasz already pointed it out before but I completely overlooked that in his comment.
2d
revised Projection is an open map
deleted 6 characters in body
2d
comment Projection is an open map
@GFR: Indeed, that was a serious blunder. Should be fixed now.
2d
revised Projection is an open map
Fixed a serious mistake
Jun
23
awarded  Nice Answer
Jun
21
comment Matrix of linear forms
It might be good to explain what the notation $I_a(M)$ precisely means. Is it the ideal generated by the entries of $M$? Why is there an $a$ in the index, if it already depends on $M$?
Jun
16
comment When $f(I)S=S$ for each ideal $I$ of $R$?
@user1: I tried to make my answer more comprehensible. Is this better?
Jun
16
revised When $f(I)S=S$ for each ideal $I$ of $R$?
added 475 characters in body
Jun
14
answered When $f(I)S=S$ for each ideal $I$ of $R$?
Jun
11
comment When does the regularity of $A$ implies the regularity of $A[w]$?
@user237522: I added an explanation of "unramified". I am not sure how easy that is to check, though.
Jun
11
revised When does the regularity of $A$ implies the regularity of $A[w]$?
added 356 characters in body
Jun
11
revised When does the regularity of $A$ implies the regularity of $A[w]$?
added 527 characters in body
Jun
11
answered When does the regularity of $A$ implies the regularity of $A[w]$?
Jun
9
revised Better understanding regular functions on a Projective variety
added 14 characters in body
Jun
5
answered Isomorphic projective subvarieties, non-isomorphic rings
Jun
5
revised Blow-up of pair of intersecting lines
deleted 47 characters in body
Jun
5
answered Blow-up of pair of intersecting lines
Jun
4
comment A categorical approach to algebraic geometry
I haven't read it, but you might have a look at Categories and Sheaves by Masaki Kashiwara and Pierre Schapira. It seems to contain lots of the stuff you want.
Jun
2
awarded  Yearling