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Messages - Aida Razi

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31
Term Test 1 / Re: TT1 = Problem 5
« on: October 16, 2012, 08:16:11 PM »
Quote from: Ian Kivlichan on October 16, 2012, 07:39:21 PM
Quote from: Aida Razi on October 16, 2012, 07:22:05 PM
Solution is attached,

Aida, I think your solution is not correct - the integral from -1 to 0 will only be 0 if x < y in H(x-y), i.e. x < -1.

Also, consider extreme cases - for C(-100), H(-100-y) can never be greater than 0, so a solution with C(x) = 1 cannot be right (unless I've totally misunderstood something).

I believe your solution is not correct; H(x) and H(x-y) has the same value for these two different domain because it is a constant function.

32
Term Test 1 / Re: TT1 = Problem 5
« on: October 16, 2012, 08:10:14 PM »
Quote from: Djirar on October 16, 2012, 08:07:48 PM
I solve the question in the same way as Aida Razi did. Of course for part b, C(x) > 0  for all x.

Yes, as C(x) is a constant function and it is equal to one, then x is lR: it can be any real number.

33
Term Test 1 / Re: TT1 = Problem 3
« on: October 16, 2012, 07:39:46 PM »
Solution is attached,

34
Term Test 1 / Re: TT1 = Problem 5
« on: October 16, 2012, 07:22:05 PM »
Solution is attached,

35
Home Assignment X / Re: Problem 4
« on: October 16, 2012, 12:09:26 PM »
For part b, you are right.

Quote from: Peishan Wang on October 15, 2012, 06:53:33 AM
And I got a different answer for part (b) as well, which is

1/2*erf⁡((1-x)/√2t) + 1/2*erf⁡((1+x)/√2t), where √2t stands for "square root of 2t".

36
Misc Math / Re: TT1Problem6
« on: October 15, 2012, 02:11:53 PM »
So, first start with whole interval and then as before examples, make it in the 0<x<+∞; Right?

Thank you guys,

37
Misc Math / TT1Problem6
« on: October 15, 2012, 01:33:57 PM »
In past term test 1, problem 6:

Write the solution of the diffusion equation on a half line 0<x<+∞,

I was wondering if we need to calculate integral on just 0<x<+∞ interval and not whole interval.

38
Home Assignment X / Re: Problem 4
« on: October 15, 2012, 02:13:58 AM »
Solution of part b is attached,

39
Home Assignment X / Re: Problem 4
« on: October 15, 2012, 02:00:33 AM »
Quote from: Aida Razi on October 15, 2012, 01:58:43 AM
Solution of part a is attached,

Where k =1 on the solution.

40
Home Assignment X / Re: Problem 4
« on: October 15, 2012, 01:58:43 AM »
Solution of part a is attached,

41
Home Assignment X / Problem2
« on: October 15, 2012, 01:34:28 AM »
Solution is attached,

42
Home Assignment X / Re: Problem 1
« on: October 15, 2012, 01:33:21 AM »
Solution is attached,

43
Misc Math / Re: Bonus Web Problem
« on: October 14, 2012, 10:30:10 PM »
Thank you for checking my solution.

I am just wondering, do we need to play with m in order to get ϕ(η) as given by (C) tends to 0 as η→∞?

44
Home Assignment X / Re: Problem 1
« on: October 14, 2012, 10:06:18 PM »
Professor Ivrii,

can we post solutions to this problem set?

45
Misc Math / Re: Bonus Web Problem
« on: October 14, 2012, 09:00:42 PM »
Here is the rest of the solution:

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