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seen Aug 14 at 22:12

Aug
14
revised How to solve a time-dependent Schrodinger equation in periodic Dirac delta potential
added 88 characters in body
Jul
2
awarded  Curious
Jun
16
comment How to solve a time-dependent Schrodinger equation in periodic Dirac delta potential
@Winther The Bloch's theorem is essentially the Floquet theory. By adding a harmonic time-dependent term, the system is both periodic in space and time, and seems to be more symmetric. I was wondering if there was some techniques to combine the Floquet theory and the Bloch theory to deal with this equation.
Jun
11
awarded  Promoter
Jun
11
revised How to solve a time-dependent Schrodinger equation in periodic Dirac delta potential
added 65 characters in body
Jun
10
comment How to solve a time-dependent Schrodinger equation in periodic Dirac delta potential
@mike Thanks, but I guess the difficult part is the time-dependence. The time-independent problem can be solved using ODE technics.
Jun
9
awarded  Yearling
Jun
9
asked How to solve a time-dependent Schrodinger equation in periodic Dirac delta potential
May
29
comment Plotting the frequency spectrum of a signal
For understanding Fourier transform, this may help.
May
14
comment How to find the asymptotic behavior of this function
Thanks :) Sorry for stupid question.
May
14
comment How to find the asymptotic behavior of this function
Thanks a lot, but how do you determine that "the second term is $O(1)$"?
May
14
accepted How to find the asymptotic behavior of this function
May
7
comment How to find the asymptotic behavior of this function
@george2079 OK, I see you points. I have flagged a request to move it. Thanks!
May
7
comment How to find the asymptotic behavior of this function
@george2079 Yes, exactly. The function is defined at only the integer values.
May
7
comment How to find the asymptotic behavior of this function
@chuy I still don't quiet understand. Could you say more of what I need to help Mathematica to do?
May
7
comment How to find the asymptotic behavior of this function
@Sektor I guess I don't understand what's the point to expand it to the third order, are you saying that it's divergent? Also after reading the post you linked, I still can't figure out the answer to my question. I'm looking for an expression that can match the function f at large k.
May
7
asked How to find the asymptotic behavior of this function
Feb
10
accepted Why a periodic function can be expressed by a set of finite numbers — question about Fourier transform?
Feb
7
comment Why a periodic function can be expressed by a set of finite numbers — question about Fourier transform?
Thanks for the update, that's very helpful. Could you explain why a continuous function is determined by its values at the rational numbers?
Feb
7
awarded  Commentator