We explain how the kind of 'parallel transport' of a wavefunction used in d
iscussing the Berry or Geometrical phase induces the conventional parallel
transport of certain real vectors. These real vectors are associated with o
perators whose commutators yield diagonal operators; or in Lie algebras tho
se operators whose commutators are in the (diagonal) Cartan subalgebra. (C)
2000 Elsevier Science B.V. All rights reserved.