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Evolution of a non-neutral cold electron positron plasma slab is investigated.Initially the slab consists of a quasineutral plasma core bounded on both sides by layers containing only positrons (or electrons).Results from a nonperturbative,or mathematically exact,analysis of the goveing fluid conservation equations and the Poisson equation show that despite their equal mass and charge magnitude,the electron and positron fronts can expand separately as well as a single fluid,and that nonlinear surface oscillations can be excited on the expansion fronts.