PERFECT LATTICE ACTIONS FOR THE GROSS-NEVEU MODEL AT LARGE-N

Fixed point actions for free and interacting staggered lattice fermion s are constructed by iterating renormalization group transformations. At large N the fixed point action for the Gross-Neveu model is a perfe ct action in the sense of Hasenfratz and Niedermayer, i,e, cut-off eff ects are completely eliminated. Tn particular, the fermionic 1-particl e energy spectrum of the lattice theory is identical with the one of t he continuum even for arbitrarily small correlation lengths. The cut-o ff effects of the chiral condensate are eliminated using a perfect ope rator.