### Adiabatic pendulum

In physics quantities which change little under slow changes of parameter, are called adiabatic invariants(1). The pendulum could be an adiabatic invariants. To get it, as well as to get any of the adiabatic invariants, the person changing the parameters of the system must not see what state the system is in(1).

1. V. I. Arnold, Mathematical Methods of Classical Mechanics, Springer-Verlag (1989)

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