Messages

1

Home Assignment 2 / Problem 1

« on: September 27, 2012, 10:06:01 AM »

Hi - In the pdf of home assignment 2 in problem 1 the inequalities throughout are different than the other version of the assignment (i.e. pdf version has 'greater than or equal to' and the other version in only '>').  Which one is correct? 

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Home Assignment 1 / Re: Problem 5

« on: September 23, 2012, 04:03:24 PM »

Thanks Jinlong - I was hoping that was the problem!  I've been trying to figure out where that partial wrt to 't' came from ... now it all makes sense.

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Home Assignment 1 / Re: Problem 5

« on: September 23, 2012, 12:10:52 PM »

Ok great - does this mean that I can understand the 2nd auxiliary condition of 5 c) as corresponding physically to a boundary condition on the velocity?

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Home Assignment 1 / Re: Problem 5

« on: September 23, 2012, 09:49:39 AM »

My reason for the asking the above question is that the examples that I have managed to find regarding Goursat problems and the wave equation all have the x<3t which made more sense to me for the integration - after thinking about it I am guessing #5 has x>3t due to the initial velocity?  The examples I was looking at only included initial positions - I was just trying to get a picture of what was happening.

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Home Assignment 1 / Re: Problem 5

« on: September 22, 2012, 08:51:54 PM »

Just wondering if in part c) of problem 5 the question should read: Consider (7) in (x<3t, x>-3t) ?
(instead of x>3t ....)