
Differential Equations Ordinary and Partial Differential Equations Math Forum 
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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  
Senior Member Joined: Dec 2006 Posts: 1,111 Thanks: 0  Quote:
 
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  
Global Moderator Joined: Dec 2006 Posts: 20,476 Thanks: 2039  Quote:
∂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: 20,476 Thanks: 2039 
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 browserdependent.


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differential, equation, partial 
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