The interpretation of complex eigenvalues of linear transformations de
fined on a real geometric algebra presents problems in that their geom
etric significance is dependent upon the kind of linear transformation
involved, as well as the algebraic lack of universal commutivity of b
ivectors. The present work shows how the machinery of geometric algebr
a can be adapted to the study of complex linear operators defined on a
unitary space. Whereas the well-defined geometric significance of rea
l geometric algebra is not lost, the primary concern here is the study
of the algebraic properties of complex eigenvalues and eigenvectors o
f these operators.