4. A Hamiltonian system in R2 is a system of the form ан ду -(x, y) == OH əx y' = -(x, y) where H R² → R is a C function called the Hamiltonian function. (Ideal Pendulum.) The system of equations 0' =v v=sin 0 describes the motion of an undamped pendulum. (a) Show that this system is a Hamiltonian system (i.e. find a Hamiltonian function for this system). (b) Determine all the critical points of the system.

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Chapter2: Second-order Linear Odes
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4. A Hamiltonian system in R2 is a system of the form
ан
ду
x'
-(x, y)
H
y'
-(x, y)
where H: R² → R is a C function called the Hamiltonian function.
?x
(Ideal Pendulum.) The system of equations
0' =v
v=sin 0
describes the motion of an undamped pendulum.
(a) Show that this system is a Hamiltonian system (i.e. find a Hamiltonian function for this
system).
(b) Determine all the critical points of the system.
(c) Plot several trajectories of the system. Indicate the direction of the motion on each tra-
jectory. (Hint: use part (a).)
Transcribed Image Text:4. A Hamiltonian system in R2 is a system of the form ан ду x' -(x, y) H y' -(x, y) where H: R² → R is a C function called the Hamiltonian function. ?x (Ideal Pendulum.) The system of equations 0' =v v=sin 0 describes the motion of an undamped pendulum. (a) Show that this system is a Hamiltonian system (i.e. find a Hamiltonian function for this system). (b) Determine all the critical points of the system. (c) Plot several trajectories of the system. Indicate the direction of the motion on each tra- jectory. (Hint: use part (a).)
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