  We present doubler-free gauge-invariant lattice vector gauge action for some
real representations of Wilson gauge fields on an octet of fermions. It is
based on a geometric representation of the Dirac equation as an evolution
equation on the three-dimensional exterior bundle /(R^3) for a single bispinor
and of the bundle (/\x/)(R^3) for an octet. We find doubler-free lattice Dirac
operators for above bundles. A gauge-invariant connection with Wilson lattice
gauge fields is possible for some real representations of the gauge group. The
QCD action of SU(3) is of this type.
  Application in lattice QCD seems useful: We don't have to waste time and
memory for doublers as well as for correction terms to suppress them.
