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Critical values and minimal periods for autonomous Hamiltonian systems
The paper studies periodic solutions of Hamiltonian systems.
It states that a range of periods for such solutions can be obtained
by diiferentiation of the function of constrained critical values
with respect to the variable constraint level. It also shows that
when a Hamiltonian is equal to a positive quadratic form plus an
oscillatory term, there exist infinitely many solutions with the same
period.