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 January 14th, 2007, 10:26 PM #1 Newbie   Joined: Nov 2006 From: Cubs Town Posts: 5 Thanks: 0 Partial Differential Equation Find the characteristic curves for the given equation. U sub xx + yU sub yy = 0[/list]
 January 15th, 2007, 08:52 AM #2 Senior Member   Joined: Nov 2006 From: I'm a figment of my own imagination :? Posts: 848 Thanks: 0 What? Will someone who actually understands this please move this topic to the appropriate forum?
January 15th, 2007, 09:16 AM   #3
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Quote:
 U sub xx + yU sub yy = 0
What does that mean?

 January 15th, 2007, 09:32 AM #4 Senior Member   Joined: Nov 2006 From: I'm a figment of my own imagination :? Posts: 848 Thanks: 0 If I had to guess, I'd say it should be: U_(x²+y) U_y² Of course, I could be wrong about this, and I still don't know what it means.
January 31st, 2007, 06:07 PM   #5
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Quote:
Originally Posted by Infinity
Quote:
 U sub xx + yU sub yy = 0
What does that mean?
U is a function of x and y.

²U/∂x² + y∂²U/∂y² = 0

 February 1st, 2007, 12:40 AM #6 Newbie   Joined: Jan 2007 Posts: 4 Thanks: 0 how do you get to put out those fancy scripts? I'd like to be able to do that here so i could post some of my questions clearly.
 February 1st, 2007, 10:21 AM #7 Senior Member   Joined: Nov 2006 From: I'm a figment of my own imagination :? Posts: 848 Thanks: 0 Some of the scripts are explained in this topic, but I don't know how skipjack made the ∂ symbols (I copied and pasted it).
 February 1st, 2007, 10:42 AM #8 Global Moderator   Joined: Dec 2006 Posts: 20,926 Thanks: 2205 I used the same principle, but used http://en.wikipedia.org/wiki/List_of...ity_references to find values for further symbols. Note that some symbols may be browser-dependent.

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