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Messages - Zarak Mahmud

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1
Home Assignment 7 / Re: Problem 3
« on: November 19, 2012, 09:55:51 PM »
Calvin: it's a bit simpler to write out ((-1)^(n+1) +1) as 0 or 2!

p.s. I am envious of your skills in LaTeX

Me too. Pretty impressive.

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Term Test 2 / Re: TT2 -- posting solutions
« on: November 14, 2012, 01:30:15 PM »
But what about the people in the late sitting? They won't be done by then.  :(

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Home Assignment Y / Re: Problem 2
« on: November 13, 2012, 08:22:01 PM »
edit: I guess I answered my question by reading the above post again.

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Home Assignment Y / Re: HAY--as preparation for TT2
« on: November 12, 2012, 03:49:15 PM »
By the way, I just wanted to remark - the hyperbola dividing the $(\alpha , \beta)$ plane is a great way to keep everything straight. I was getting mixed up with the signs until I start thinking of it in this way.

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Home Assignment Y / Re: Problem 1
« on: November 12, 2012, 11:45:59 AM »
In the last line, shouldn't the power to the second exponential be ikx instead of iky?

No--it is Fourier integral for $k\mapsto y$ (remember FT was by $y$). Calvin, WTH, why are you not defending your solution?

He must be taking a long nap after typing it all up.

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Home Assignment Y / Re: HAY--as preparation for TT2
« on: November 12, 2012, 11:44:04 AM »
It is discussed in lecture 13. If you have the Strauss textbook, it is discussed in quite a bit of detail in chapter 4.3

See  Appendix C and Appendix B.

You linked to appendix C twice.  :)

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Home Assignment Y / Re: HAY--as preparation for TT2
« on: November 11, 2012, 10:38:16 PM »
It is discussed in lecture 13. If you have the Strauss textbook, it is discussed in quite a bit of detail in chapter 4.3

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Home Assignment Y / Re: HAY--as preparation for TT2
« on: November 11, 2012, 09:51:28 PM »
The only way we can have a negative eigenvalue is if the line $y=-\frac{1}{\alpha}$ intersects $\tanh \beta l$. This can't happen if $\alpha$ is positive. Have you tried drawing the graph?

By the way, for negative eigenvalues the convention is to use $\gamma$ instead of $\beta$.

 

9
APM346 Misc / Re: HA4
« on: November 11, 2012, 04:40:33 PM »
Well I got my mark but it would have been nice to have our assignments returned to us sooner so that we could utilize them as an aid in preparation for the upcoming test.

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Term Test 2 / Re: Scope of Term Test 2
« on: November 10, 2012, 06:04:18 PM »
Oh sorry, I saw the post from the second link but missed the first one. I too have a conflict and must go to the early sitting. I assume we just show up.

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Home Assignment 5 / Re: About HA5
« on: November 10, 2012, 05:07:56 PM »
I'm confused over why the sketches for the full Fourier series and the sine Fourier series are different. They have the same formula. I would have expected them both to look like the plot for the sine Fourier series. Thanks.

For the function $f(x) = x$? Yes I think they should look the same.

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Term Test 2 / Re: Scope of Term Test 2
« on: November 10, 2012, 04:04:44 PM »
So then I imagine HA7 is not due on the 14th? Since last time the assignment was replaced by 'HAX' and due date was pushed back. Or am I being a bit presumptuous?

 

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Home Assignment 6 / Re: Problem 2
« on: November 08, 2012, 12:21:22 AM »
Calvin, if you type your solutions in LaTeX or TeX, you could post just the source fixing some discrepancies on the fly

I changed the .pdfs to png's for now, when I have some time later I'll try to massage the tex code into mathjax/forum format.

Calvin - just curious, what program are you in?

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Home Assignment 6 / Re: Problem 2
« on: November 08, 2012, 12:19:45 AM »
Aida: How did you do the integral?

He didn't. He used a fourier transform pair from part 1(a).

Yes, That's right!
By the way Zarak, I guess it is clear from my name that I am female!

Hahah oops, sorry!

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Home Assignment 6 / Re: Problem 2
« on: November 07, 2012, 09:39:25 PM »
Aida: How did you do the integral?

She didn't. She used a fourier transform pair from part 1(a).

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