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Apr
17
comment Atiyah-MacDonald, exercise 2.11
@TerrenceJ - You can take $I:=A$. Thanks for your interest!
Feb
11
awarded  Nice Answer
Oct
14
comment When did mathematicians begin to use the letter x to denote unknown values?
mathoverflow.net/q/30307/461
Aug
16
awarded  Yearling
Jul
9
comment Errata for Atiyah-Macdonald
@darijgrinberg - Thanks! I rewrote (in a hopefully correct way) the last edit.
Jul
9
revised Errata for Atiyah-Macdonald
rewrote previous edit
Apr
22
awarded  Custodian
Apr
22
reviewed Edit A naive question about the double dual of a vector space
Apr
22
revised A naive question about the double dual of a vector space
improved formatting, changed "second dual" to "double dual", which seems slightly more standard
Apr
14
awarded  Popular Question
Jan
14
awarded  Popular Question
Nov
8
comment Is PA consistent? do we know it?
@DavidRoberts - Sorry, I didn't express myself well. I shouldn't have said "explicit". I edited. Thanks!
Nov
8
revised Is PA consistent? do we know it?
removed a word
Nov
8
answered Is PA consistent? do we know it?
Aug
21
awarded  Necromancer
Aug
12
asked Is there a positive integer k such that any endomorphism of any free module over any commutative ring is a linear combination of k idempotents?
Aug
8
comment Trace of the identity map in a projective module
PS. I think $M=M/(1-e_i)M$ should be $M_i=M/(1-e_i)M$.
Aug
7
comment Trace of the identity map in a projective module
Dear Neil: I'd be most grateful if you could tell me whether what I wrote here is correct.
Jul
2
awarded  Curious
Jun
12
revised A naive question about the double dual of a vector space
edit clearly indicated