868 reputation
21623
bio website iecl.univ-lorraine.fr/…
location Nancy, France
age 64
visits member for 4 years, 10 months
seen 1 hour ago

Email: pierre.yves.gaillard at gmail.com

If you have any idea about this MathOverflow question, thanks for letting me know.


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 second dual of a vector space
edit clearly indicated
Jun
5
revised Dimension of infinite product of vector spaces
rewrote the answer
Jun
1
revised Dimension of infinite product of vector spaces
added EDIT 2
May
30
revised Dimension of infinite product of vector spaces
edit clearly indicated
May
30
comment Dimension of infinite product of vector spaces
Dear Todd: This is just to tell you that I posted a minor complement to your great answer as a community wiki answer.
May
30
comment dim Hom(V,W) =?
To me, it was invaluable! (Also I now realize - thanks to you, Todd and François - how easy it was to answer my question using the Erdős-Kaplansky Theorem, and how silly my approach was...)
May
30
comment Dimension of infinite product of vector spaces
Dear François: Here is a tiny bit of nitpicking. I find your question very nice, but I think it would be more correct to write in your blockquote "a family of nonzero vector spaces" instead of "a family of vector spaces".
May
30
answered Dimension of infinite product of vector spaces
May
30
awarded  Yearling
May
30
comment dim Hom(V,W) =?
Dear Fernando: Thanks for you answer. I especially enjoyed the answer mathoverflow.net/a/49572/461 of Todd Trimble's to the question you linked to!
May
30
accepted dim Hom(V,W) =?
May
30
awarded  Good Question
May
30
asked dim Hom(V,W) =?
May
17
comment a naive question about the second dual of a vector space
@GeraldEdgar - If $A$ is a $K$-algebra and $B$ is an $A$-module, then $\mathrm{End}_A(B)$ designates the $K$-vector space of all $A$-linear endomorphisms of $B$.
May
17
comment a naive question about the second dual of a vector space
@GeraldEdgar - Yes, that's what I'm saying. Don't hesitate to tell me if it's easy, even if it's humiliating for me... Thanks for your comment.