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Messages - Ian Kivlichan

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16
Home Assignment 7 / Re: Problem 1
« on: November 19, 2012, 09:30:53 PM »
Hopeful solutions attached! :)

(Essentially the same as Fanxun's, but with exponential instead of sines and cosines.. the difference is trivial.)

17
Home Assignment 7 / Re: Problem 4
« on: November 19, 2012, 09:30:33 PM »
Hopeful solutions attached! :)

Note that for 4.b), we require that as r goes to infinity, u goes to 0, which forces $A_0 = 0$.

18
Home Assignment 7 / Re: Problem 3
« on: November 19, 2012, 09:30:20 PM »
Hopeful solutions attached! :)

(parts 1,2)

19
Home Assignment 7 / Re: Problem 2
« on: November 19, 2012, 09:30:00 PM »
Hopeful solutions attached! :)

For 2.b), the ODE is exactly the same, but we switch the sign of k^2 u.

20
Home Assignment 7 / Re: Problem 1
« on: November 19, 2012, 09:20:53 PM »
Quote from: Danny Dinh on November 17, 2012, 08:35:21 PM
Are we supposed to use spherical coordinates for this question? If so, should r be replaced with rho?
You can call the variables whatever you feel like - it makes no difference.

21
Home Assignment 7 / Re: Problem 4
« on: November 19, 2012, 11:19:38 AM »
Oh - oops! I hadn't read that far yet. Thank you!

22
Home Assignment 7 / Problem 4
« on: November 19, 2012, 03:29:55 AM »
For Problem 4, it seems the solution can only defined up to a constant - is that alright?

23
Term Test 2 / Re: TT2--Problem 4
« on: November 15, 2012, 11:46:03 PM »
Hopeful solution attached! :)

24
Term Test 2 / Re: TT2--Problem 1
« on: November 15, 2012, 10:38:38 PM »
Chen Ge, in 1.b) I'm not sure you can have the derivative of f since it isn't differentiable.. :S

25
Term Test 2 / Re: TT2--Problem 1
« on: November 15, 2012, 10:31:55 PM »
Hopeful solutions to both parts attached! :)

26
Term Test 2 / Re: TT2--Problem 5
« on: November 15, 2012, 10:31:07 PM »
Hopeful solution attached! :)

27
Term Test 2 / Re: TT2--Problem 2
« on: November 15, 2012, 10:30:24 PM »
Hopeful solution to part c attached! :)

EDIT: Was not originally attached?

28
Term Test 2 / Re: TT2--Problem 3
« on: November 15, 2012, 10:30:00 PM »
Hopeful solution attached! :)

EDIT: was not originally attached..?

29
Home Assignment 6 / Re: Problem 2
« on: November 07, 2012, 09:35:05 PM »
Aida: How did you do the integral?

30
Home Assignment 6 / Re: Problem 4
« on: November 07, 2012, 04:32:43 PM »
Is there a way to go from $\int_{-\infty}^{\infty}{\frac{\sin^2(x)}{x^2}dx}$ to $\int_{-\infty}^{\infty}{\frac{\sin(x)}{x}dx}$?

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