Verify that V = x14+ 2x22+2x1x2 + x12 is a Lyapunov function for the system described by the following state  equations dx1/dt = x2 dx2/dt= -x2 - x13. Then, check the stability of the system.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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Verify that

V = x14+ 2x22+2x1x2 + x12

is a Lyapunov function for the system described by the following state 
equations

dx1/dt = x2
dx2/dt= -x2 - x13.

Then, check the stability of the system.

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