A practical implementation of the overlap Dirac operator [1+γ₅ε(H)]/2 is presented. The implementation exploits the sparseness of H and does not require full storage. A simple application to parity invariant three dimensional SU(2) gauge theory is carried out to establish that zero modes related to topology are exactly reproduced on the lattice.
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Herbert Neuberger (1998) studied this question.
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