  The overlap lattice-Dirac operator contains the sign function $\epsilon (H)$.
Recent practical implementations replace $\epsilon (H)$ by a ratio of
polynomials, $H P_n (H^2)/Q_n (H^2)$, and require storage of $2n+2$ large
vectors. Here I show that one can use only 4 large vectors at the cost of
executing the core conjugate algorithm twice. The slow-down might be less than
by a factor of 2, depending on the architecture of the computer one uses.
