SPINOR FIELD AS ELEMENTARY EXCITATIONS OF A SYSTEM OF SCALAR FIELDS

The Dirac field and its quanta are obtained from the imposition of an infinite member of Dirac 2nd class constraints on a system of complex scalar fields having an indefinite internal metric. The spin-1/2 chara cter of the constrained system follows from constraint-induced couplin g of the scalar system's independent internal and space-time symmetrie s, from constraint restrictions on allowed symmetries. The resulting s pinor field quanta are seen to exist as a class of ''elementary excita tions'' belonging to a dynamical algebra existing naturally within the system of complex scalar fields.