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### Messages - Bowei Xiao

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##### Home Assignment 6 / Problem 1--simplified
« on: November 01, 2012, 02:11:55 PM »
I guess in problem 1 part c and d...you actually want to type X^n exp() and so does d? Guess there's typo there..

Yes, thanks, it was typo, but I decided for a sake of simplicity to take $n=1$. V.I.

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##### Home Assignment 4 / Re: Problem 3
« on: October 23, 2012, 12:42:40 PM »
Is there supposed to be condition at t=0? Because I feel there's no restriction for interior and that can go wildly I guess?

3
##### Term Test 1 / Re: TT1 = Problem 4
« on: October 18, 2012, 12:23:17 AM »
Is it ok to use he fact that u is actually continious and so the limit is actually the initially boundary condition?

The question says to use the formula from part (a).
the formula from a can lead to continuity as well.. I guess...omg..hope they give me some partial marks!

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##### Term Test 1 / Re: TT1 = Problem 4
« on: October 17, 2012, 11:54:35 AM »
Is it ok to use he fact that u is actually continious and so the limit is actually the initially boundary condition?

5
##### Home Assignment 3 / Re: Problem5
« on: October 16, 2012, 03:16:13 PM »
Should it be Ut- xUxx = -2*x*epsilon instead of -2xk? At the last three line of the picture you attached?

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##### Home Assignment X / Re: problem 3
« on: October 14, 2012, 05:59:23 PM »
Are we supposed to deal with the complex variables in Term test?or just the real valued like last year term test1?

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##### Home Assignment 3 / Re: problem 3
« on: October 08, 2012, 09:26:55 PM »
just wondering is that sounds true if i try to change the integral to some kind of PDF of a normal distribution?

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##### Home Assignment 3 / Re: Problem 6
« on: October 04, 2012, 10:30:41 PM »
so, the only condition for a is Ut = K Uxx?

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##### Misc Math / Re: Classification criteria for PDEs
« on: October 04, 2012, 06:31:09 PM »
Is B=7/2?....I thought on one of the book it gives the general form as AUxx+2BUxt+CUtt+...=0?

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##### Home Assignment 3 / Problem 6
« on: October 04, 2012, 06:26:59 PM »
In question 6 part a, Are we supposed we have condition like U(l,t)=U(0,t)=0?

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##### Home Assignment 2 / Re: Problem4
« on: September 30, 2012, 02:07:28 PM »
well..yes,that's true, I always assume the Utt exisits otherwise the equation doesn't make sense though

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##### Home Assignment 2 / Re: Problem4
« on: September 30, 2012, 01:38:47 PM »
And I believe that's the only condition u have  ,Are u sure u are not gonna use it?

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