My Math Forum second order ODEs

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 May 3rd, 2014, 06:27 PM #1 Member   Joined: Apr 2014 From: australia Posts: 68 Thanks: 32 second order ODEs Hi, are any of these linear second order non-homogeneous ODES? I was thinking possibly 3 & 4? Thanks q4.jpg Last edited by skipjack; May 4th, 2014 at 03:01 PM.
 May 3rd, 2014, 08:43 PM #2 Math Team   Joined: Dec 2013 From: Colombia Posts: 7,512 Thanks: 2514 Math Focus: Mainly analysis and algebra I'd agree with that. 5 might be, but I can't read the exponent on the exponential function very clearly. I have a suspicion that the term is $e^{z^2}$, in which case it's not homogeneous.
 May 3rd, 2014, 09:17 PM #3 Member   Joined: Apr 2014 From: australia Posts: 68 Thanks: 32 thanks, would you class '5' as linear or non-linear?
 May 3rd, 2014, 10:09 PM #4 Math Team   Joined: Dec 2013 From: Colombia Posts: 7,512 Thanks: 2514 Math Focus: Mainly analysis and algebra Oh! With that $\sqrt{1+y}$ I guess it's non-linear. Thanks from harley05

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