Abstract
We argue that the way to get the true adiabatic evolution of fermionic coherent states (FCS's) is to use an averaged version of the quantum variational principle. Then Hannay's angle does not appear in the global phase picked by the FCS during its evolution but in the argument of the parameter specifying the FCS. In fact Abe's derivation of the classical holonomy must be understood in terms of canonical transformations.
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