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March 20th, 2017, 10:01 AM  #1 
Newbie Joined: Mar 2017 From: Thailand Posts: 4 Thanks: 0 Math Focus: Calculus  Please enlighten me.
Hello Redeemer, I got stuck at $\displaystyle (d^4y/dx^4)+3(d^2y/dx^2)^5+5y=0$. I'm not sure what method I should do. Thanks a lot for your help. TheNewDiff 
March 20th, 2017, 03:48 PM  #2 
Senior Member Joined: Dec 2015 From: Earth Posts: 182 Thanks: 23 
Try$\displaystyle \;$ $\displaystyle y=e^{kx}$ 
March 20th, 2017, 04:09 PM  #3  
Math Team Joined: May 2013 From: The Astral plane Posts: 1,659 Thanks: 652 Math Focus: Wibbly wobbly timeywimey stuff.  Quote:
Dan  
March 20th, 2017, 10:17 PM  #4 
Newbie Joined: Mar 2017 From: Thailand Posts: 4 Thanks: 0 Math Focus: Calculus  
March 21st, 2017, 02:14 AM  #5 
Math Team Joined: May 2013 From: The Astral plane Posts: 1,659 Thanks: 652 Math Focus: Wibbly wobbly timeywimey stuff.  
June 18th, 2017, 10:37 AM  #6 
Newbie Joined: Dec 2016 From: Austin Posts: 11 Thanks: 1 
Was this an initial value problem? If so, please post the initial conditions. Thanks!

December 9th, 2017, 04:27 PM  #7 
Newbie Joined: Mar 2017 From: Thailand Posts: 4 Thanks: 0 Math Focus: Calculus  
December 9th, 2017, 06:34 PM  #8 
Senior Member Joined: Sep 2016 From: USA Posts: 227 Thanks: 122 Math Focus: Dynamical systems, analytic function theory, numerics 
The vector field for this is analytic so the formal power series solution will be the unique solution.


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