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Messages - Aida Razi

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1
Home Assignment 3 / Re: problem 3
« on: December 18, 2012, 12:45:51 PM »
Solution to question3 part b is attached!

2
Misc Math / Last year FinalExam
« on: December 13, 2012, 01:56:49 PM »
http://weyl.math.toronto.edu:8888/APM346-2011F-forum/index.php?topic=208.0

In last year final exam, problem 1, when you solved it by method of continuation, I was wondering if the first term will be:

u(x,t)=1/2(-ϕ(x−ct)+ϕ(x+ct))+ 1/2c∫ct+x0ψ(s)ds +1/2c∫ct−x0ψ(s)ds

instead of what you wrote:
"In our case correct formula is different

u(x,t)=1/2(ϕ(x−ct)−ϕ(x+ct))+ 1/2c∫ct+x0ψ(s)ds +1/2c∫ct−x0ψ(s)ds"


3
APM346 Misc / Final Exam
« on: December 12, 2012, 07:47:32 PM »
Dear professor Ivrii,

How do you suggest us to prepare for the final exam?
Does it have the same format as last year final exam?

Thank you so much for your time,

4
Misc Math / Re: Lec 23 Possion formula clarification
« on: December 08, 2012, 01:10:03 PM »
I was wondering if Cn has to be sin(nθ) instead of cos(nθ)?

5
APM346 Misc / Re: TT2Marks
« on: December 07, 2012, 03:25:55 PM »
Sorry to bother you,
Thank you,

Dear professor,

There is an announcement on the portal that we can go and get our TT2 papers today but I am just wondering if you are going to post our marks on the portal as well because some of us might not be able to go and pick up the test today?

Thank you kindly,

How should I know? I am in Stockholm. -- But actually marks were there, simply TAs forgot to remove the stealth cover from them.

6
APM346 Misc / TT2Marks
« on: December 07, 2012, 02:43:31 PM »
Dear professor,

There is an announcement on the portal that we can go and get our TT2 papers today but I am just wondering if you are going to post our marks on the portal as well because some of us might not be able to go and pick up the test today?

Thank you kindly,

7
Home Assignment 8 / Problem1
« on: November 28, 2012, 09:30:03 PM »
Here is the solution!

8
Term Test 2 / Re: TT2--Problem 2
« on: November 18, 2012, 07:39:15 PM »
So, An is not zero when n=4k.

9
Term Test 2 / Re: TT2--Problem 2
« on: November 18, 2012, 07:37:19 PM »
Please check the attachment!

10
Term Test 2 / Re: TT2--Problem 2
« on: November 18, 2012, 03:41:24 PM »
Integration is done!

11
Term Test 2 / Re: TT2--Problem 2
« on: November 18, 2012, 01:47:40 PM »
Solution to (d) and (e) is attached!

12
Misc Math / Lecture 19
« on: November 13, 2012, 03:12:17 PM »
In heat equation: We know IFT of e^ (-(ξ^2)/2) is (√2pi)e (-(x^2)/2). Then when we try to find IFT of e^ (-(ktξ^2)), we scale ξ to √(2kt)ξ and therefore x scale to √(2kt)x. But in the lecture note, it is mentioned that x scale to (2kt)^(-1/2)x. I believe it should be just square root of 2kt and not (-square root) of 2kt.

13
Misc Math / Re: Last Year HW:5.4.12
« on: November 12, 2012, 11:57:41 AM »
Aida, please next time provide a link, like this one
http://weyl.math.toronto.edu:8888/APM346-2011F-wiki/index.php/Home_Assignment_8#5.4.12.

I am just wondering in this question when P.T. wrote Parseval's equality, it shouldn't contain "integral |sin(nπx/l)|^2"; Right?


Yes, except $\int_0^l |sin(nπx/l)|^2\,dx =l/2$, so you don't need this integral. Ditto for 5.4.13, 5.4.15.



And who is P.T.?

"Paul Tan" Last year student.

14
Misc Math / Last Year HW:5.4.12
« on: November 11, 2012, 10:33:08 PM »
I am just wondering in this question when P.T. wrote Parseval's equality, it shouldn't contain "integral |sin(nπx/l)|^2"; Right?

15
Home Assignment 4 / Re: Problem 2
« on: November 11, 2012, 04:16:18 PM »
Solution is attached!

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