296 reputation
37
bio website users.mai.liu.se/hanlu09
location Linköping, Sweden
age 45
visits member for 5 years, 5 months
seen 2 days ago

Aug
15
comment Visualizing functions with a number of independant variables
New link to VisIt: wci.llnl.gov/simulation/computer-codes/visit
Aug
15
comment Roots of truncations of e^x - 1
New address: users.mai.liu.se/hanlu09/complex/taylor
Jun
23
revised What are the benefits of viewing a sheaf from the “espace étalé” perspective?
Corrected a typo in the title ("persepctive").
Jun
23
suggested approved edit on What are the benefits of viewing a sheaf from the “espace étalé” perspective?
May
20
revised Best Algebraic Geometry text book? (other than Hartshorne)
Updated the link to Gathmann's lecture notes.
May
13
revised Errata for Atiyah-Macdonald
Added item about p. 82.
May
13
answered Errata for Atiyah-Macdonald
Nov
14
awarded  Nice Answer
Feb
19
comment Why do primes dislike dividing the sum of all the preceding primes?
(Nitpicking: The guy's name was Mertens, not Merten.)
Aug
22
awarded  Autobiographer
Aug
22
awarded  Yearling
Jun
25
awarded  Excavator
Sep
18
comment Examples of seemingly elementary problems that are hard to solve?
@suvrit: To the two different parenthesizations mentioned in the preceding sentence.
Sep
13
comment Geometric interpretation of matrix minors
"Lindström", to be precise.
Aug
13
comment What are the Poisson tensors for which hamiltonians are left invariant?
Your terminology seems a little nonstandard. $X_f$ is usually called the Hamiltonian vector field associated to $f$. When one speaks of "the Hamiltionian", this refers the the function $f$.
Feb
23
comment Elementary mathematical books
...and when I clicked it, I ended up at the Chern essay. (Perhaps not so surprising in hindsight, since both links point to the same URI.)
Feb
8
comment Reference for working with the implicit function theorem
Broken link. Hopefully this works better: fr.wikipedia.org/wiki/…
Feb
4
comment Does this formula have a rigorous meaning, or is it merely formal.
@Dick: I think the new name was introduced for marketing reasons, and is mainly used by the followers of David Hestenes.
Feb
3
comment Does this formula have a rigorous meaning, or is it merely formal.
...and by the way, I wish I could refer you to the book that a colleague of mine is writing, but unfortunately it is not finished yet: mai.liu.se/~anaxe/GMA.html
Feb
3
comment Does this formula have a rigorous meaning, or is it merely formal.
@Dick: GA is really just another name for Clifford algebras, and there are determinants everywhere if you do coordinate calculations in a Clifford algebra. For example, the highest graded part of the Clifford product of two (homogeneous) multivectors is the exterior product of those multivectors, and exterior product is related to determinants in a way that you're probably familiar with.