Reducing to First-Order Equation

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SUMMARY

The discussion focuses on the reduction of a fifth-order differential equation to a first-order system. The equation presented is 2y''''' + 12x^3y''' - 2y^7y'' - 8y = 0. The solution involves defining a system of first-order equations where u1' = u2, u2' = u3, u3' = u4, u4' = u5, and u5' = -6x^3(u4) + y^7(u3) + 4(u1). It is confirmed that the absence of first and fourth-order terms in the original equation does not affect the validity of the reduction process.

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Banana
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Can someone double check me please? I'm not sure if it matters that the fourth and first orders are missing.

Reduce to a first-order equation:

2y''''' + 12x^3y''' - 2y^7y'' - 8y = 0

My solution:
u1' = u2
u2' = u3
u3' = u4
u4' = u5
u5' = -6x^3(u4) + y^7(u3) + 4(u1)
 
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I think it's correct. First and fourth order do not appear because in original equation don't appear too.
 


Your solution looks correct to me! It does not matter that the fourth and first orders are missing in the original equation, as long as the remaining orders are properly reduced to a first-order equation. Good job!
 

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