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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 nonlinear?

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 nonlinear.


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ode, odes, order 
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