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In this paper, we obtain the dispersion relation for the lower-hybridoscillations/waves in a cold magnetized electron-positron-ion (e-p-i) plasma.It is found that the frequency of the lower-hybrid oscillations in an e-p-iplasma is approximate $1/\sqrt{3}$ times the frequency of lower-hybridoscillations in an electron-ion (e-i) plasma, provided the plasma density ishigh, and the equilibrium densities of the positron and the ion are balanced.The present work may have some relevance for laboratory/astrophysical e-p-iplasmas.

Lower-hybrid oscillations in a cold magnetized electron-positron-ion plasma